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1. Product Overview

The Allen-Bradley 20P41AE405RA0NNN is a high-capacity PowerFlex DC regenerative drive designed for demanding industrial DC motor applications.

This model is rated at 405 A and 300 HP / approximately 224 kW under its normal-duty rating. It belongs to the PowerFlex DC series and is designed for the 575 V AC three-phase class.

The drive uses a six-pulse input configuration and supports four-quadrant regenerative operation. This makes it particularly suitable for machinery that requires controlled acceleration, deceleration, reversing, and regeneration.

The 20P41AE405RA0NNN is intended for large industrial equipment where the motor may have substantial inertia and where controlled regenerative braking is an important part of the operating process.

Typical applications can include large winding machines, unwinders, paper and converting equipment, metal-processing machinery, large conveyors, roll drives, tension-control systems, reversing machinery, and existing high-power DC motor installations.

The standard configuration is an IP20 / NEMA/UL Type Open drive with conformal coating, a blank plate instead of a standard HIM, and no communication module included as standard. The field supply is a single-phase regulated field supply.

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2. Brand and Product Series

Item	Specification
Brand	Allen-Bradley
Product Series	PowerFlex DC
Product Type	Regenerative DC Drive
Catalog Number	20P41AE405RA0NNN
Motor Type	DC Motor
Voltage Class	575 V AC
Input Voltage Category	500…600 V AC class
Input Phase	Three Phase
Input Type	6 Pulse
Rated Output Current	405 A
Normal-Duty Motor Rating	300 HP
Normal-Duty Power	Approximately 224 kW
Motor Operation	Four Quadrant / Regenerative
Field Supply	Single Phase Regulated
Frame Size	Frame B
Enclosure	IP20 / NEMA/UL Type Open
Conformal Coating	Yes
HIM	No HIM / Blank Plate
Communication Module	None in standard configuration

The 20P41AE405RA0NNN is part of the PowerFlex DC family and occupies the 300 HP / 405 A position in the 575 V regenerative product range. The product configuration identifies it as a 600 VAC class, three-phase, 405 A, 300 HP PowerFlex DC drive.

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3. Main Technical Parameters

Parameter	Specification
Brand	Allen-Bradley
Series	PowerFlex DC
Model / Catalog Number	20P41AE405RA0NNN
Drive Type	Regenerative DC Drive
Input Voltage	575 V AC class
Input Phase	3 Phase
Input Type	6 Pulse
Motor Operation	Four Quadrant / Regenerative
Rated Output Current	405 A
Normal-Duty Motor Rating	300 HP
Normal-Duty Power	Approximately 224 kW
Field Supply	Single Phase Regulated
Frame Size	Frame B
Enclosure	IP20
Enclosure Type	NEMA/UL Type Open
Conformal Coating	Yes
Human Interface Module	No HIM / Blank Plate
Communication	No standard communication module
Approx. Height	311 mm
Approx. Width	388 mm
Approx. Depth	350 mm
Approx. Dimensions	311 × 388 × 350 mm
Approx. Height	12.2 in
Approx. Width	15.3 in
Approx. Depth	13.8 in
Approx. Drive Weight	32 kg
Approx. Packaged Weight	34 kg
Installation	Panel / Electrical Cabinet
Application Category	High-Power Industrial DC Motor Control

The 405 A rating and 300 HP rating are the defining electrical characteristics of this model. The product configuration specifies 600 VAC class, three-phase input, 405 A output current, 300 HP capacity, IP20 construction, conformal coating, and four-quadrant regenerative operation.

The Frame B mechanical envelope is approximately 311 × 388 × 350 mm. The Frame B technical data places the 575 V rating code 405 in the approximately 32 kg drive / 34 kg packaged weight group.

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4. Product Identification

The complete catalog number is:

20P41AE405RA0NNN

For industrial purchasing, maintenance, and spare-parts management, the complete catalog number should be retained.

A description such as “300 HP PowerFlex DC drive” does not contain enough information to identify every aspect of the configuration.

The full catalog number provides a much more precise identification point when preparing:

• Spare-parts lists
• Electrical drawings
• Maintenance records
• Procurement documents
• Equipment BOMs
• Retrofit specifications
• Replacement-drive documentation

For an existing machine, recording the complete catalog number can significantly reduce the possibility of ordering a drive with the wrong voltage class, current rating, operating configuration, or option set.

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5. 300 HP / 224 kW Motor Rating

The 20P41AE405RA0NNN is rated for 300 HP, corresponding to approximately 224 kW.

This places the drive firmly in the high-power industrial DC motor category.

A 300 HP motor is normally associated with substantial mechanical loads and significant stored energy.

Applications at this power level can include large rolls, winding systems, processing equipment, heavy conveyors, industrial material-handling machinery, and other high-power rotating equipment.

The drive therefore needs to handle considerably more than simple speed adjustment.

The complete control system may need to manage acceleration, torque, speed regulation, deceleration, regenerative energy, direction changes, and feedback.

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6. 405 Amp Current Capacity

The 405 A output-current rating is one of the most important characteristics of this model.

DC motor armature current is closely associated with torque production, so the current capacity of a DC drive is a critical selection parameter.

The 405 A rating represents a major increase over the 270 A model.

A simplified comparison within the same 575 V regenerative family is:

Model	Current Rating	Normal-Duty Rating
20P41AE101RA0NNN	101.3 A	75 HP / 56 kW
20P41AE135RA0NNN	135 A	100 HP / 75 kW
20P41AE270RA0NNN	270 A	200 HP / 149 kW
20P41AE405RA0NNN	405 A	300 HP / 224 kW
20P41AE540RA0NNN	540 A	400 HP / 298 kW

The 405 A model therefore occupies an important position between the 200 HP and 400 HP versions of the 575 V PowerFlex DC regenerative range.

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7. Four-Quadrant Regenerative Operation

The 20P41AE405RA0NNN is designed for four-quadrant regenerative operation.

Four-quadrant operation means that the drive can control motor torque and motor direction in both directions.

The four basic operating conditions can be summarized as follows:

Quadrant	Motor Direction	Operating Condition
Quadrant I	Forward	Forward Motoring
Quadrant II	Forward	Forward Regeneration
Quadrant III	Reverse	Reverse Motoring
Quadrant IV	Reverse	Reverse Regeneration

This operating capability is especially valuable for machinery that frequently changes speed or direction.

It is also useful for systems where a large rotating load must be decelerated under controlled conditions.

During regenerative operation, the motor can operate as a generator and return electrical energy through the regenerative drive system.

The catalog configuration specifically identifies the motor operation as Four Quadrant Operation – Regen.

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8. Regenerative Braking

Regenerative braking is one of the main reasons to use a four-quadrant DC drive.

When a large motor-driven load decelerates, its mechanical inertia produces energy.

In a regenerative system, this energy can be handled electrically rather than relying solely on mechanical friction braking.

This can be particularly useful for:

• Large rolls
• Winders
• Unwinders
• Large conveyors
• Metal-processing machinery
• Paper-processing equipment
• Reversing machinery
• High-inertia drums
• Large material-handling systems

For machines with repeated acceleration and deceleration cycles, regenerative operation can become a central part of the machine’s normal operating sequence.

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9. 575 V AC Three-Phase Input

The 20P41AE405RA0NNN is designed for the 575 V AC three-phase class.

The product information identifies the input as 600 VAC class, three phase, with the catalog product voltage listed as 575 V AC.

This voltage category is commonly associated with higher-power industrial installations.

At 300 HP, the complete electrical supply system requires careful engineering.

Before installation, the following should be checked:

• Incoming voltage
• Transformer rating
• Transformer impedance
• Short-circuit rating
• Protective devices
• Grounding
• Cable size
• Disconnect equipment
• Cabinet wiring
• Line conditions
• Harmonic considerations

The actual plant voltage should always be checked against the complete drive and motor system requirements.

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10. Six-Pulse Input

The 20P41AE405RA0NNN uses a 6-pulse input configuration.

Six-pulse converter technology is a conventional industrial power-conversion arrangement used in DC drive systems.

For a high-power 405 A installation, the six-pulse input should be evaluated as part of the complete electrical system.

Important considerations may include:

• Transformer selection
• Line impedance
• Harmonic current
• Protective devices
• Grounding
• Power quality
• Cable sizing
• Electrical-code requirements

The six-pulse architecture is therefore an important part of the overall system design rather than simply an isolated catalog feature.

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11. Regulated Field Supply

The drive includes a single-phase regulated field supply.

The field supply is an important component of a traditional DC motor system.

The motor field establishes the magnetic field required for normal motor operation.

Field voltage and field current should be compared with the motor nameplate information before commissioning.

For an existing machine, engineers should verify:

• Motor field voltage
• Motor field current
• Field winding configuration
• Field-loss protection
• Motor speed range
• Field weakening requirements

The correct field configuration is essential for reliable DC motor operation.

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12. Frame B Construction

The 20P41AE405RA0NNN is a Frame B drive.

The Frame B mechanical dimensions are approximately:

Mechanical Parameter	Approximate Value
Height	311 mm
Width	388 mm
Depth	350 mm
Height	12.2 in
Width	15.3 in
Depth	13.8 in
Drive Weight	32 kg
Drive + Packaging	34 kg

The published Frame B dimensions are approximately 311 mm high × 388 mm wide × 350 mm deep.

The technical data groups the 575 V 405 A rating with approximately 32 kg drive weight and 34 kg drive-and-packaging weight.

These values are useful for preliminary cabinet planning.

Final mechanical design should also allow room for cable entry, terminal access, airflow, mounting hardware, service access, and surrounding equipment.

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13. IP20 / NEMA/UL Type Open Enclosure

The 20P41AE405RA0NNN is specified as an IP20 / NEMA/UL Type Open drive.

This means it is intended for installation within an appropriate electrical enclosure or protected cabinet.

The surrounding cabinet should provide suitable protection against the environmental conditions present at the installation site.

Particular attention should be paid to:

• Dust
• Moisture
• Condensation
• Conductive contamination
• Excessive temperature
• Corrosive gases
• Mechanical contamination
• Vibration

A 300 HP drive can generate considerable heat, so cabinet thermal design is particularly important.

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14. Conformal Coating

The product configuration includes conformal coating.

Conformal coating adds a protective layer to electronic assemblies and can provide additional resistance to certain environmental conditions.

This can be useful in industrial installations where humidity or airborne contamination is a concern.

However, conformal coating does not eliminate the requirement for an appropriate enclosure.

The IP20 / NEMA/UL Type Open design still requires installation in a suitable protected environment.

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15. No HIM / Blank Plate Configuration

The catalog configuration is supplied with No HIM, meaning that a blank plate is used instead of a standard Human Interface Module.

This type of configuration can be useful when the drive is controlled by an external machine-control system.

Typical external control arrangements may involve:

• PLC
• Machine controller
• External operator station
• Analog speed reference
• Digital start/stop signals
• External feedback
• Plant automation system

The absence of a standard HIM should be considered during commissioning and maintenance planning.

The engineering team should ensure that there is a practical method for parameter configuration, diagnostics, monitoring, and troubleshooting.

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16. No Standard Communication Module

The 20P41AE405RA0NNN is specified with no standard communication module.

This simply identifies the base catalog configuration.

It does not mean that a complete machine cannot use modern automation or communication architecture.

The appropriate interface depends on the machine design.

An older production line may use hardwired control signals, while a newer modernization project may incorporate a communication interface as part of the overall system design.

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17. Main Product Applications

The 20P41AE405RA0NNN is intended for demanding industrial DC motor applications.

Typical application categories include:

• Large winding machines
• Large unwinding systems
• Paper machines
• Paper converting lines
• Printing machinery
• Metal-processing lines
• Roll drives
• Slitter-rewinders
• Tension-control systems
• Large conveyors
• High-inertia equipment
• Reversing machinery
• Material-handling equipment
• Large production machinery
• Existing 300 HP DC motor installations
• Industrial DC drive modernization projects

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18. Winding Machine Applications

Large winding machines often require precise control of motor speed and torque.

The motor may need to accelerate a large roll from standstill to operating speed.

As the material accumulates, the roll diameter changes.

This means the control system needs to continually manage motor speed and torque.

During deceleration, the rotating roll can return a substantial amount of energy.

The regenerative operation of the 20P41AE405RA0NNN can therefore be particularly useful for this type of machinery.

The drive can form part of a larger system incorporating:

• Tension control
• Dancer feedback
• Speed feedback
• PLC control
• Line synchronization
• Torque control
• Machine interlocks

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19. Unwinding Applications

Unwind machinery has a different mechanical operating profile but similar requirements for controlled speed and torque.

As the roll becomes smaller, the motor operating point changes.

The control system must compensate for the changing roll diameter while maintaining the required material tension.

The regenerative capability can also become important during certain operating conditions where the motor transitions from motoring into generating operation.

This makes a four-quadrant drive particularly useful for demanding unwind applications.

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20. Paper Processing Applications

Large paper machines and converting lines have historically included many DC motor installations.

Typical applications can include:

• Roll drives
• Winding sections
• Unwinding sections
• Coating sections
• Slitter systems
• Tension sections
• Finishing equipment

When the existing DC motor and mechanical system remain in good condition, upgrading the drive can be an attractive modernization strategy.

Replacing only the drive can potentially reduce mechanical changes compared with converting the entire machine to an AC motor system.

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21. Metal-Processing Applications

Large metal-processing machines can require substantial motor torque and carefully controlled speed.

Potential applications include:

• Processing rolls
• Payoff reels
• Tension stands
• Reversing rolls
• Large material-handling systems
• Production-line drives
• Heavy rotating machinery

The 405 A capacity provides a substantially larger current range than the smaller 100 HP and 200 HP models.

This makes the model suitable for much larger DC motor installations.

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22. Large Conveyor Applications

Large conveyors can contain significant mechanical inertia.

During startup, the drive needs to accelerate the load smoothly.

During stopping, the drive must control the energy stored in the rotating components.

For a high-inertia conveyor, regenerative operation can be an important part of the overall braking strategy.

The drive should still be designed together with the machine’s mechanical brake, emergency-stop system, safety controls, and load characteristics.

Regenerative operation should not be treated as a replacement for safety-related braking functions.

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23. High-Inertia Machinery

High-inertia applications are particularly well suited to regenerative drive technology.

Examples include:

• Large drums
• Large rolls
• Flywheel-type loads
• Heavy rotating machinery
• Winding systems
• Unwinding systems
• Large conveyors
• High-speed process equipment

During acceleration, energy is transferred from the electrical system to the mechanical system.

During deceleration, energy moves in the opposite direction.

A regenerative drive provides an electrical path for managing this operating condition.

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24. Reversing Machinery

Some industrial machines repeatedly change direction.

A typical cycle might be:

1. Accelerate forward.
2. Run at operating speed.
3. Decelerate.
4. Stop.
5. Accelerate in reverse.
6. Run in reverse.
7. Regeneratively decelerate.
8. Repeat.

Four-quadrant operation is especially relevant to this kind of application.

The drive can control both the direction of motor rotation and the direction of torque.

This is one of the main differences between a regenerative four-quadrant drive and a basic single-direction motor controller.

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25. Existing DC Motor Retrofit Applications

One of the strongest practical applications for the 20P41AE405RA0NNN is modernization of an existing high-power DC motor system.

Consider an existing production machine using a 300 HP DC motor.

If the motor remains mechanically sound, replacing an old drive may be less disruptive than converting the entire machine to an AC motor.

Potentially retained components can include:

• DC motor
• Gearbox
• Coupling
• Mechanical transmission
• Mounting arrangement
• Machine frame
• Existing production mechanics

The modernization project would primarily focus on the electrical and control system.

The actual feasibility depends on the condition and specifications of the existing equipment.

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26. Main Product Advantages

26.1 High 405 A Current Rating

The 405 A rating provides substantial armature-current capacity for large industrial DC motors.

This makes the model suitable for applications considerably larger than those served by the 135 A and 270 A models.

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26.2 300 HP / 224 kW Capacity

The 300 HP rating positions this drive in the high-power industrial category.

It is appropriate for machinery requiring a large DC motor and substantial torque capacity.

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26.3 Four-Quadrant Regenerative Operation

Four-quadrant operation supports:

• Forward motoring
• Forward regeneration
• Reverse motoring
• Reverse regeneration

This is particularly useful for reversing machines and high-inertia applications.

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26.4 Regenerative Braking

Regenerative operation allows the drive to manage energy generated by the motor during deceleration.

This is particularly valuable for large rotating loads.

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26.5 Regulated Field Supply

The single-phase regulated field supply provides an integrated field-control capability for compatible DC motors.

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26.6 Compact Frame B Construction

Despite the 300 HP class rating, the unit remains within the Frame B mechanical platform.

The approximate body dimensions are 311 × 388 × 350 mm.

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26.7 Conformal-Coated Configuration

The conformal-coated electronics provide additional protection in demanding industrial environments.

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26.8 Retrofit Potential

The PowerFlex DC architecture can be useful when an existing DC motor and mechanical system remain suitable.

This can reduce the scope of a modernization project compared with a complete DC-to-AC conversion.

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27. Five Recommended Same-Series Models

The following models are closely related 575 V regenerative PowerFlex DC products.

Model / Catalog Number	Rated Current	Normal-Duty HP	Normal-Duty kW	Frame	Approx. Dimensions	Approx. Drive Weight
20P41AE067RA0NNN	67.5 A	50 HP	37 kW	B	311 × 388 × 350 mm	25.5 kg
20P41AE101RA0NNN	101.3 A	75 HP	56 kW	B	311 × 388 × 350 mm	25.5 kg
20P41AE135RA0NNN	135 A	100 HP	75 kW	B	311 × 388 × 350 mm	25.5 kg
20P41AE270RA0NNN	270 A	200 HP	149 kW	B	311 × 388 × 350 mm	29.5 kg
20P41AE405RA0NNN	405 A	300 HP	224 kW	B	311 × 388 × 350 mm	32 kg

The 575 V regenerative PowerFlex DC selection data identifies these current and horsepower combinations, with the models from 50 HP through 300 HP associated with Frame B.

The Frame B dimensional data is approximately 311 × 388 × 350 mm, while the technical data lists the 405 rating code in the 32 kg drive-weight group.

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28. 20P41AE067RA0NNN – 50 HP Model

The 20P41AE067RA0NNN is a smaller 575 V regenerative PowerFlex DC model.

It is rated at approximately 67.5 A and 50 HP / 37 kW.

It is suitable for applications where the DC motor is substantially smaller than the 300 HP motor associated with the main model.

Its approximate Frame B dimensions are 311 × 388 × 350 mm, with an approximate drive weight of 25.5 kg.

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29. 20P41AE101RA0NNN – 75 HP Model

The 20P41AE101RA0NNN provides approximately 101.3 A and 75 HP / 56 kW.

It occupies the next size position above the 50 HP model.

This model can be useful for medium-sized DC motor systems that do not require the much larger current capacity of the 270 A or 405 A versions.

Its approximate Frame B weight is 25.5 kg.

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30. 20P41AE135RA0NNN – 100 HP Model

The 20P41AE135RA0NNN is rated at approximately 135 A and 100 HP / 75 kW.

It is approximately one-third of the 405 A current rating of the main model.

This makes it useful as a comparison point when determining whether a particular application requires 100 HP, 200 HP, or 300 HP drive capacity.

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31. 20P41AE270RA0NNN – 200 HP Model

The 20P41AE270RA0NNN is the immediate lower-power comparison model.

It provides approximately:

• 270 A
• 200 HP
• 149 kW
• Frame B
• Four-quadrant regenerative operation

Its approximate dimensions are 311 × 388 × 350 mm, and its approximate drive weight is 29.5 kg.

The 405 A model provides significantly more current capacity for applications requiring the 300 HP rating.

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32. 20P41AE405RA0NNN – 300 HP Model

The 20P41AE405RA0NNN is the primary product covered in this description.

Parameter	Specification
Model	20P41AE405RA0NNN
Brand	Allen-Bradley
Series	PowerFlex DC
Voltage	575 V AC class
Input	3 Phase
Input Type	6 Pulse
Output Current	405 A
Motor Rating	300 HP
Motor Power	Approximately 224 kW
Operation	Four Quadrant / Regenerative
Field Supply	Single Phase Regulated
Frame	B
Enclosure	IP20 / NEMA/UL Type Open
Conformal Coating	Yes
HIM	Blank Plate / No HIM
Communication	None standard
Dimensions	Approximately 311 × 388 × 350 mm
Drive Weight	Approximately 32 kg
Packaged Weight	Approximately 34 kg

This combination of current, horsepower, regenerative operation, and mechanical configuration makes it a high-capacity industrial DC drive.

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33. Next Larger Same-Series Model – 20P41AE540RA0NNN

For applications requiring more capacity than the 405 A model, the next major 575 V regenerative model is the 20P41AE540RA0NNN.

Parameter	Specification
Model / Catalog Number	20P41AE540RA0NNN
Series	PowerFlex DC
Voltage Class	575 V AC
Rated Current	540 A
Normal-Duty Rating	400 HP
Normal-Duty Power	Approximately 298 kW
Operation	Four Quadrant / Regenerative
Frame	C
Input	Three Phase / 6 Pulse
Field Supply	Single Phase Regulated
Dimensions	Configuration-dependent; verify mechanical drawing
Weight	Configuration-dependent; verify mechanical drawing

This model moves from Frame B into the larger Frame C construction.

It is therefore not simply a higher-current version from a mechanical standpoint; the cabinet design and installation requirements should also be reconsidered.

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34. Same-Series Electrical Comparison

Model / Catalog Number	Voltage Class	Current	HP	kW	Frame	Operation
20P41AE067RA0NNN	575 V AC	67.5 A	50 HP	37 kW	B	Four Quadrant / Regenerative
20P41AE101RA0NNN	575 V AC	101.3 A	75 HP	56 kW	B	Four Quadrant / Regenerative
20P41AE135RA0NNN	575 V AC	135 A	100 HP	75 kW	B	Four Quadrant / Regenerative
20P41AE270RA0NNN	575 V AC	270 A	200 HP	149 kW	B	Four Quadrant / Regenerative
20P41AE405RA0NNN	575 V AC	405 A	300 HP	224 kW	B	Four Quadrant / Regenerative
20P41AE540RA0NNN	575 V AC	540 A	400 HP	298 kW	C	Four Quadrant / Regenerative

The 575 V product selection shows the progression from 50 HP through 400 HP, with the 400 HP model moving to Frame C.

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35. Same-Series Mechanical Comparison

Model / Catalog Number	Frame	Approx. Height	Approx. Width	Approx. Depth	Approx. Drive Weight
20P41AE067RA0NNN	B	311 mm	388 mm	350 mm	25.5 kg
20P41AE101RA0NNN	B	311 mm	388 mm	350 mm	25.5 kg
20P41AE135RA0NNN	B	311 mm	388 mm	350 mm	25.5 kg
20P41AE270RA0NNN	B	311 mm	388 mm	350 mm	29.5 kg
20P41AE405RA0NNN	B	311 mm	388 mm	350 mm	32 kg
20P41AE540RA0NNN	C	Verify mechanical drawing	Verify mechanical drawing	Verify mechanical drawing	Configuration-dependent

The Frame B dimensions are approximately 311 × 388 × 350 mm. The Frame B weight data places the 405 rating code in the 32 kg category.

For the larger Frame C model, the mechanical dimensions should be verified against the exact configuration before cabinet fabrication.

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36. Five Popular Related Allen-Bradley Models

The following five models are popular products from other PowerFlex families.

They are included as related same-brand models, not as direct replacements for the 20P41AE405RA0NNN.

The main distinction is that these are AC variable-frequency drive products, whereas the 20P41AE405RA0NNN is a regenerative DC drive.

Model / Catalog Number	Series	Drive Type	Voltage Class	Current / Rating	Power	Dimensions	Weight
25B-D010N114	PowerFlex 525	AC Drive	380…480 V AC	10.5 A	5 HP / 4 kW	Configuration-dependent	Configuration-dependent
25B-D017N114	PowerFlex 525	AC Drive	380…480 V AC	17 A class	10 HP / 7.5 kW	Configuration-dependent	Approx. 3.03 kg
25B-D030N114	PowerFlex 525	AC Drive	380…480 V AC	30 A	20 HP / 15 kW ND	Configuration-dependent	Configuration-dependent
20G11ND077AA0NNNNN	PowerFlex 755	AC Drive	480 V AC class	77 A class	50 HP class	Configuration-dependent	Configuration-dependent
20G11ND156AA0NNNNN	PowerFlex 755	AC Drive	480 V AC / 650 V DC	156 A	125 HP / 93 kW ND	Configuration-dependent	Approx. 68.04 kg

These products should be viewed as broader same-brand AC drive products.

They are not direct catalog-number substitutions for a 300 HP PowerFlex DC regenerative drive.

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37. PowerFlex 525 Related Products

The PowerFlex 525 family is generally associated with compact AC motor applications.

For example, the 25B-D010N114 is in the 5 HP / 4 kW class, while the 25B-D017N114 is in the approximately 10 HP / 7.5 kW class.

These products are therefore much smaller than the 300 HP 20P41AE405RA0NNN.

Their relevance is primarily in new machine designs or smaller AC motor applications rather than direct replacement of the 300 HP DC drive.

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38. PowerFlex 755 Related Products

The PowerFlex 755 family is intended for larger and more advanced industrial AC drive applications.

The 20G11ND077AA0NNNNN represents a 480 V class drive in the approximately 77 A range.

The 20G11ND156AA0NNNNN is a substantially larger configuration, with approximately 156 A capacity and a 125 HP / 93 kW normal-duty rating.

These products may become relevant if an existing DC machine is being converted to an AC motor system.

Such a conversion is a larger engineering project because the motor and potentially the mechanical system must also be considered.

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39. DC Drive Versus AC Drive Modernization

A comparison between the PowerFlex DC architecture and an AC drive architecture can be useful when planning a machine modernization.

Consideration	PowerFlex DC Modernization	AC Drive Conversion
Existing DC Motor	Potentially retained	Usually replaced
Existing Mechanical System	Potentially retained	May require changes
Gearbox	Potentially retained	May require evaluation
Coupling	Potentially retained	May require modification
Field Circuit	Retained where compatible	Normally eliminated
Four-Quadrant Operation	Available in regenerative configuration	Depends on AC drive system
Regeneration	Regenerative DC architecture	Requires suitable AC regenerative solution
Feedback	Existing feedback may be reusable	New feedback may be required
Motor Maintenance	DC brush/commutator maintenance remains	AC motor generally has simpler rotor construction
Retrofit Scope	Primarily electrical/control	May include electrical and mechanical work
Downtime	Potentially reduced	Potentially greater
Application	Existing DC machinery	New or converted AC machinery

The choice between the two approaches depends on the machine’s technical requirements and modernization objectives.

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40. Motor Compatibility

Before installing the 20P41AE405RA0NNN, the existing DC motor should be checked carefully.

Important parameters include:

Motor Parameter	Required Check
Motor Type	DC motor
Motor Power	Approximately 300 HP class
Armature Voltage	Verify
Armature Current	Verify against drive capability
Field Voltage	Verify
Field Current	Verify
Base Speed	Verify
Maximum Speed	Verify
Feedback Device	Verify
Tachometer	Verify if applicable
Encoder	Verify if applicable
Load Inertia	Verify
Acceleration Time	Verify
Deceleration Time	Verify
Regenerative Duty	Verify
Duty Cycle	Verify
Cooling	Verify
Motor Insulation	Inspect
Bearings	Inspect
Coupling	Inspect

A 300 HP nameplate alone does not establish complete compatibility.

The electrical characteristics of the motor and the mechanical characteristics of the machine must both be checked.

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41. Cabinet Design

The 20P41AE405RA0NNN is an IP20 / NEMA/UL Type Open drive.

Therefore, cabinet installation should be part of the overall system design.

The basic Frame B body is approximately:

311 mm × 388 mm × 350 mm

However, the cabinet should provide additional space.

Clearance may be required for:

• Cooling airflow
• Power cables
• Control wiring
• Terminal access
• Grounding
• Maintenance
• Drive removal
• Cable bending radius
• Adjacent equipment
• Protective components

The drive weight of approximately 32 kg should also be considered when designing the mounting arrangement.

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42. Thermal Management

Thermal design becomes increasingly important as drive power increases.

A 300 HP drive can generate substantial heat.

The cabinet design should account for:

• Drive losses
• Ambient temperature
• Internal cabinet temperature
• Cooling airflow
• Fan operation
• Filter condition
• Other heat-generating components
• Installation altitude
• Continuous loading
• Regenerative operation

A cabinet that has enough physical space may still be inadequate if the thermal design is insufficient.

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43. Power Wiring

The 405 A current rating makes power wiring an important part of the installation.

The electrical design should consider:

• Incoming AC conductors
• Armature conductors
• Field wiring
• Grounding conductors
• Protective devices
• Disconnect equipment
• Cable insulation
• Terminal ratings
• Cable routing
• Power/control separation
• Cabinet grounding
• Electromagnetic compatibility

The final conductor sizing should be based on the applicable electrical requirements and the complete installation conditions.

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44. Feedback and Control

Large DC machinery often uses feedback to improve speed regulation and process performance.

Possible feedback systems include:

• Tachometer
• Encoder
• Speed feedback
• Current feedback
• Tension feedback
• Dancer feedback

The existing feedback system should be identified before replacing an older DC drive.

Important information includes the feedback device type, output characteristics, scaling, wiring, and required operating range.

This is especially important when modernizing an older production machine because the feedback device may have been replaced or modified during the machine’s service life.

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45. Maintenance Considerations

A high-power DC drive installation should be included in a structured maintenance program.

Drive-side maintenance can include:

• Cabinet inspection
• Cooling fan inspection
• Filter inspection
• Terminal inspection
• Grounding inspection
• Cable inspection
• Electronic contamination inspection
• Connection inspection

Motor-side maintenance can include:

• Brush inspection
• Brush replacement
• Commutator inspection
• Bearing inspection
• Cooling inspection
• Field-circuit inspection
• Feedback-device inspection

For a production-critical 300 HP motor, preventive maintenance can be especially important because unexpected downtime can have a significant impact on the overall production line.

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46. Spare Parts Management

The complete catalog number should be recorded in the spare-parts system.

Spare-Part Parameter	Specification
Brand	Allen-Bradley
Series	PowerFlex DC
Catalog Number	20P41AE405RA0NNN
Voltage Class	575 V AC
Current	405 A
Motor Rating	300 HP
Motor Power	Approximately 224 kW
Operation	Four Quadrant / Regenerative
Input	3 Phase / 6 Pulse
Field Supply	Single Phase Regulated
Frame	B
Dimensions	Approximately 311 × 388 × 350 mm
Drive Weight	Approximately 32 kg
Packaged Weight	Approximately 34 kg
Enclosure	IP20 / NEMA/UL Type Open
Conformal Coating	Yes
HIM	Blank Plate / No HIM
Communication	None standard

This information is particularly useful when a plant operates several different PowerFlex DC ratings.

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47. Product Selection Checklist

Before purchasing the 20P41AE405RA0NNN for a replacement project, the following points should be checked.

Electrical Requirements

• Incoming voltage
• Three-phase supply
• Transformer capacity
• Short-circuit characteristics
• Motor armature voltage
• Motor armature current
• Field voltage
• Field current
• Protective devices

Mechanical Requirements

• Motor condition
• Coupling condition
• Gearbox condition
• Load inertia
• Maximum motor speed
• Required acceleration
• Required deceleration
• Mechanical braking

Control Requirements

• PLC interface
• Analog reference
• Digital control
• Speed feedback
• Encoder
• Tachometer
• Tension feedback
• Communication requirements

Installation Requirements

• Cabinet size
• Cabinet cooling
• Power-cable routing
• Control-cable routing
• Grounding
• Maintenance access
• Drive mounting

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48. Practical Application Example – 300 HP Winding Machine

Consider a large industrial winding machine driven by a 300 HP DC motor.

At startup, the drive must accelerate the rotating mass smoothly.

As the machine reaches production speed, the drive maintains the commanded speed and torque.

During normal operation, the machine may continuously adjust motor speed according to line speed and tension requirements.

When the machine decelerates, the motor can enter regenerative operation.

The energy associated with the rotating roll is then managed by the regenerative drive system.

If the machine also requires reversing, four-quadrant operation becomes particularly valuable.

This is a typical application in which the 405 A current capacity of the 20P41AE405RA0NNN becomes relevant.

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49. Practical Application Example – Large Roll Drive

A large industrial roll can store a substantial amount of mechanical energy.

The motor must provide sufficient torque to accelerate the roll.

During deceleration, the stored energy is returned through the motor.

A regenerative drive can control this process electrically.

For a 300 HP class roll drive, the 405 A capacity provides a substantially larger operating range than smaller PowerFlex DC models.

The final drive selection should still be based on the actual motor nameplate, load profile, and required duty cycle.

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50. Practical Application Example – Reversing Production Equipment

Some heavy production equipment operates in alternating forward and reverse directions.

The operating sequence may be:

Forward acceleration → Forward operation → Regenerative deceleration → Reverse acceleration → Reverse operation → Regenerative deceleration

This sequence requires coordinated control of both speed and torque.

A four-quadrant regenerative drive is well suited to this type of operating pattern.

The PLC or machine controller can provide the application-specific commands while the drive handles the motor-control function.

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51. Practical Application Example – DC Drive Modernization

An older production line may contain a 300 HP DC motor that is still mechanically reliable.

Replacing the existing drive with a modern DC drive can potentially preserve the:

• Existing motor
• Gearbox
• Coupling
• Mechanical mounting
• Production mechanism
• Machine frame

This can reduce the mechanical scope of the modernization.

The project may instead concentrate on the drive, control wiring, cabinet, feedback, protection, and automation system.

The feasibility of this approach should always be established through a complete engineering assessment.

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52. Same-Series Model Selection Table

Application Rating	Model / Catalog Number	Current	HP	kW	Frame	Approx. Weight
50 HP class	20P41AE067RA0NNN	67.5 A	50 HP	37 kW	B	25.5 kg
75 HP class	20P41AE101RA0NNN	101.3 A	75 HP	56 kW	B	25.5 kg
100 HP class	20P41AE135RA0NNN	135 A	100 HP	75 kW	B	25.5 kg
200 HP class	20P41AE270RA0NNN	270 A	200 HP	149 kW	B	29.5 kg
300 HP class	20P41AE405RA0NNN	405 A	300 HP	224 kW	B	32 kg
400 HP class	20P41AE540RA0NNN	540 A	400 HP	298 kW	C	Verify configuration

This table illustrates how the PowerFlex DC family increases in current and motor capacity.

The 405 A model represents the 300 HP position in the range, while the next 540 A model moves into the larger Frame C mechanical category.

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53. Same-Brand Popular Model Comparison

Model / Catalog Number	Series	Type	Voltage	Current	Power	Dimensions	Weight
25B-D010N114	PowerFlex 525	AC Drive	380…480 V AC	10.5 A	5 HP / 4 kW	Configuration-dependent	Configuration-dependent
25B-D017N114	PowerFlex 525	AC Drive	380…480 V AC	17 A class	10 HP / 7.5 kW	Configuration-dependent	Approx. 3.03 kg
25B-D030N114	PowerFlex 525	AC Drive	380…480 V AC	30 A	20 HP / 15 kW ND	Configuration-dependent	Configuration-dependent
20G11ND077AA0NNNNN	PowerFlex 755	AC Drive	480 V AC class	77 A class	50 HP class	Configuration-dependent	Configuration-dependent
20G11ND156AA0NNNNN	PowerFlex 755	AC Drive	480 V AC / 650 V DC	156 A	125 HP / 93 kW ND	Configuration-dependent	Approx. 68.04 kg

These five products are broader same-brand comparisons.

They should not be interpreted as direct replacement catalog numbers for the 20P41AE405RA0NNN.

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54. Why the 20P41AE405RA0NNN Is Different From Smaller PowerFlex DC Models

The main difference is the 405 A current capacity and corresponding 300 HP / 224 kW rating.

Compared with the 135 A model, the current capacity is three times as high.

Compared with the 270 A model, the current capacity is 50% higher.

This difference is important when sizing a drive for a large DC motor.

The drive should be selected according to the actual motor current and application duty rather than simply choosing the largest available model.

Oversizing can also affect cost, cabinet requirements, protection, and system design.

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55. 405 A Model Versus 270 A Model

Parameter	20P41AE270RA0NNN	20P41AE405RA0NNN
Voltage Class	575 V AC	575 V AC
Current	270 A	405 A
Motor Rating	200 HP	300 HP
Power	149 kW	224 kW
Frame	B	B
Approx. Dimensions	311 × 388 × 350 mm	311 × 388 × 350 mm
Approx. Drive Weight	29.5 kg	32 kg
Operation	Four Quadrant / Regenerative	Four Quadrant / Regenerative
Input	3 Phase / 6 Pulse	3 Phase / 6 Pulse
Field Supply	Single Phase Regulated	Single Phase Regulated

The two models share the same general Frame B mechanical envelope, but the 405 A version provides substantially more electrical capacity.

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56. 405 A Model Versus 540 A Model

Parameter	20P41AE405RA0NNN	20P41AE540RA0NNN
Voltage Class	575 V AC	575 V AC
Current	405 A	540 A
Motor Rating	300 HP	400 HP
Power	224 kW	298 kW
Frame	B	C
Operation	Four Quadrant / Regenerative	Four Quadrant / Regenerative
Input	3 Phase / 6 Pulse	3 Phase / 6 Pulse
Field Supply	Single Phase Regulated	Single Phase Regulated
Dimensions	311 × 388 × 350 mm	Configuration-dependent
Weight	32 kg	Configuration-dependent

The 540 A model provides greater electrical capacity but moves into a different mechanical frame category.

This means that upgrading from a 405 A unit to a 540 A unit is not simply a matter of increasing the current rating; the cabinet and mechanical installation should also be reconsidered.

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57. Overall Product Advantages Summary

Advantage	Description
405 A Output	High armature-current capability for large DC motors
300 HP Rating	Suitable for approximately 224 kW normal-duty motor applications
575 V AC Input	Designed for high-voltage industrial three-phase systems
Four-Quadrant Operation	Supports motoring and regenerative operation in both directions
Regenerative Braking	Useful for high-inertia and reversing machinery
Six-Pulse Input	Established industrial DC-drive architecture
Regulated Field Supply	Supports compatible DC motor field operation
Frame B	Compact mechanical envelope for this power class
Conformal Coating	Additional electronic protection
IP20 / NEMA/UL Open	Designed for protected cabinet installation
No HIM	Suitable for externally controlled machine systems
Retrofit Potential	Can support modernization of existing DC machinery

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58. Final Technical Summary

The Allen-Bradley 20P41AE405RA0NNN is a high-capacity PowerFlex DC regenerative drive designed for demanding industrial DC motor applications.

Its key specifications are:

575 V AC class

Three-phase input

Six-pulse input

405 A output current

300 HP normal-duty rating

Approximately 224 kW

Four-quadrant regenerative operation

Single-phase regulated field supply

Frame B

IP20 / NEMA/UL Type Open

Conformal coating

No HIM / blank plate

No standard communication module

The approximate mechanical dimensions are 311 × 388 × 350 mm, and the approximate drive weight is 32 kg, with an approximate packaged weight of 34 kg.

The model occupies the 300 HP / 405 A position within the 575 V regenerative PowerFlex DC range.

The closest same-series models include the 20P41AE067RA0NNN, 20P41AE101RA0NNN, 20P41AE135RA0NNN, 20P41AE270RA0NNN, and 20P41AE540RA0NNN.

Among these, the 270 A model is the immediate lower-capacity comparison, while the 540 A model is the next larger step.

The 20P41AE405RA0NNN is especially relevant to large winding machines, unwinding systems, paper and converting machinery, metal-processing equipment, large conveyors, high-inertia loads, reversing machinery, roll drives, and existing 300 HP DC motor installations.

Its most important technical characteristic is the combination of 405 A current capacity and four-quadrant regenerative operation.

This combination allows the drive to handle substantial motor torque requirements while also supporting controlled deceleration and regenerative operating conditions.

For an existing 300 HP DC motor, the drive can be considered as part of a modernization project where retaining the existing motor and mechanical system is technically desirable.

Before final selection, the motor armature voltage, armature current, field voltage, field current, base speed, maximum speed, feedback device, load inertia, acceleration and deceleration requirements, regenerative duty, incoming AC supply, cabinet cooling, and control architecture should all be checked.

For applications being converted from DC motor technology to AC motor technology, PowerFlex 525 and PowerFlex 755 products can be considered as broader same-brand alternatives, but they are not direct catalog-number replacements for this regenerative DC drive.

Overall, the 20P41AE405RA0NNN is positioned as a high-power industrial DC drive for applications where 300 HP motor capacity, 405 A current handling, four-quadrant operation, controlled regeneration, and compatibility with large DC motor systems are important.

Its combination of electrical capacity, regenerative functionality, regulated field supply, Frame B construction, and conformal-coated IP20 configuration makes it a substantial industrial drive solution for large DC machinery.