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1. Product Overview

The Allen-Bradley 20P41AE675RA0NNN is a high-power regenerative DC drive in the PowerFlex DC product family. It is designed for large industrial DC motors where high current capacity, controlled acceleration and deceleration, reversing capability, and regenerative operation are important.

The model is rated at 675 A and is associated with the 500 HP / 373 kW motor power class in the 575 V AC three-phase PowerFlex DC range. It uses a six-pulse input arrangement, four-quadrant regenerative operation, a regulated single-phase field supply, an IP20 / NEMA/UL Type Open enclosure configuration, and conformal coating. The standard catalog configuration does not include a HIM and does not include a standard communication module.

The 20P41AE675RA0NNN is a particularly substantial member of the PowerFlex DC family. It sits above the 540 A / 400 HP model and below the still-higher-current 810 A / 600 HP model in the 575 V regenerative product range.

Because it is designed for a 675 A output level, this drive is intended for large industrial equipment rather than small or general-purpose motor applications. It is especially relevant to machinery where a large DC motor must repeatedly accelerate, decelerate, reverse direction, or return energy during braking.

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2. Brand and Product Series

Item	Description
Brand	Allen-Bradley
Product Family	PowerFlex DC
Product Series	PowerFlex DC Drive
Model	20P41AE675RA0NNN
Drive Type	Regenerative DC Drive
Voltage Class	500…600 V AC class
Nominal System Class	575 V AC
Input	Three-phase AC
Input Type	6 Pulse
Output Current	675 A
Motor Power Class	500 HP
Motor Power Class	373 kW
Motor Operation	Four-quadrant regenerative
Frame Size	C
Enclosure	IP20, NEMA/UL Type Open
Conformal Coating	Yes
HIM	No HIM / Blank Plate
Communication Module	None-Standard
Field Supply	Single-phase regulated
Primary Application	Large industrial DC motor control

The catalog information identifies the 20P41AE675RA0NNN as a PowerFlex 575 V AC 500 HP DC drive with a 675 A output rating and four-quadrant regenerative operation.

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3. Main Technical Parameters

Parameter	Specification
Model / Catalog Number	20P41AE675RA0NNN
Brand	Allen-Bradley
Series	PowerFlex DC
Drive Type	Regenerative DC Drive
Input Voltage Class	500…600 V AC
Nominal Voltage	575 V AC class
Input Phase	3 Phase
Input Type	6 Pulse
DC Output Current	675 A
Motor Power	500 HP
Motor Power	373 kW
Motor Operation	Four Quadrant / Regenerative
Frame	C
Enclosure	IP20
Enclosure Classification	NEMA/UL Type Open
Conformal Coating	Yes
HIM	No HIM / Blank Plate
Standard Communication	None
Field Supply	Single-Phase Regulated
Typical Motor Type	Industrial DC Motor
Typical Application	Large industrial machinery
Approx. Overall Height	521 mm
Approx. Overall Width	511 mm
Approx. Overall Depth	416 mm
Approx. Drive Weight	72 kg
Approx. Packaged Weight	94 kg

The published Frame C mechanical data gives an overall envelope of approximately 521 mm × 511 mm × 416 mm. For the 575 V regenerative Frame C rating group, the listed drive weight is approximately 72 kg, with approximately 94 kg for the drive and packaging.

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4. Dimensions and Weight

The 20P41AE675RA0NNN uses the Frame C mechanical platform.

Mechanical Parameter	Specification
Model	20P41AE675RA0NNN
Frame	C
Overall Height	521 mm
Overall Height	20.5 in
Overall Width	511 mm
Overall Width	20.1 in
Overall Depth	416 mm
Overall Depth	16.4 in
A1 Dimension	499 mm
B1 Dimension	400 mm
B2 Dimension	200 mm
B3 Dimension	55 mm
B4 Dimension	56 mm
B5 Dimension	10.5 mm
Drive Weight	72 kg
Packaged Weight	94 kg

The Frame C dimensional data is shared by the applicable high-current PowerFlex DC drive configurations. The mechanical envelope is approximately 521 mm high, 511 mm wide and 416 mm deep.

For cabinet design, these figures should be considered the drive’s approximate physical envelope rather than the complete required cabinet size.

Additional space is normally required for power cables, terminals, ventilation, service access, wiring bends, grounding connections, and maintenance.

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5. 500 HP / 373 kW Power Class

The 20P41AE675RA0NNN belongs to the 500 HP / 373 kW power class.

This is a high-power industrial drive rating.

At this size, the drive is normally associated with substantial production equipment rather than small machine tools or general-purpose motor applications.

The 675 A output rating provides the current capacity required by large DC motors operating in demanding industrial environments.

The corresponding 373 kW power class places this model between the 400 HP / 298 kW 540 A model and the 600 HP / 447 kW 810 A model in the same 575 V regenerative DC family.

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6. 675 A Output Rating

The 675 A rating is one of the most important specifications when selecting this drive.

DC motor torque is strongly related to armature current, so the drive’s current capacity is directly relevant to the torque requirements of the motor and machine.

A 675 A drive therefore provides a substantially higher current capability than the 405 A and 540 A models.

This additional capacity can be important in machinery requiring:

• High starting torque.
• High acceleration torque.
• Heavy load handling.
• Frequent acceleration and deceleration.
• Reversing.
• Regenerative braking.
• High continuous production loads.

The 675 A rating should always be matched against the actual motor nameplate current, motor voltage, duty cycle, ambient conditions, and machine requirements.

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7. Four-Quadrant Regenerative Operation

One of the most important characteristics of the 20P41AE675RA0NNN is its four-quadrant regenerative operation.

Four-quadrant operation allows the drive to manage motor torque and speed in both directions.

In simplified terms, the four operating conditions can be described as:

1. Forward motoring.
2. Forward regenerative braking.
3. Reverse motoring.
4. Reverse regenerative braking.

This operating capability is valuable for machines where the motor needs to reverse or where the machine’s mechanical load can drive the motor during deceleration.

The official product configuration identifies the motor operation as Four Quadrant ops: Regen.

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8. Regenerative Braking

Regenerative braking is particularly useful for high-inertia machinery.

A large roll, drum, flywheel, conveyor, or other rotating load stores mechanical energy while operating.

When the machine decelerates, that stored energy can drive the motor.

The motor then behaves as a generator.

A regenerative DC drive controls this energy flow and can return appropriate regenerative energy toward the AC supply.

This is especially useful in applications with frequent stopping, reversing, lowering, tension control, or high-inertia acceleration and deceleration.

For a 500 HP machine, regenerative operation can be an important part of the overall electrical and mechanical design.

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9. 575 V AC Three-Phase Input

The 20P41AE675RA0NNN belongs to the 500…600 V AC three-phase PowerFlex DC drive group and is identified as the 575 V AC 500 HP model.

This voltage class is intended for high-power industrial electrical systems.

The three-phase AC input provides the power source for the drive’s controlled DC output.

The actual plant supply should be checked carefully before installation.

Important considerations include:

• Incoming line voltage.
• Frequency.
• Transformer capacity.
• Short-circuit current.
• Grounding method.
• Line impedance.
• Protective devices.
• Input cabling.
• Power-quality requirements.

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10. Six-Pulse Input

The 20P41AE675RA0NNN uses a six-pulse input.

The six-pulse architecture is a conventional industrial power-conversion arrangement for converting three-phase AC power into controlled DC power.

It is widely associated with traditional industrial DC drive systems.

At 675 A, however, the electrical installation is substantial, so the complete input power system must be engineered appropriately.

Depending on the installation, additional equipment such as line reactors, transformers, protective devices, and switching equipment may be required.

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11. Regulated Field Supply

The model includes a single-phase regulated field supply configuration.

The field supply is important for conventional DC motors because the motor field establishes the magnetic flux required for motor operation.

The field system therefore needs to be matched to the motor.

Before replacing an existing DC drive, the following should be checked:

Motor Field Parameter	Required Check
Field Voltage	Confirm motor requirement
Field Current	Confirm motor requirement
Field Type	Confirm shunt / separately excited arrangement
Field Protection	Confirm required protection
Field Loss Monitoring	Confirm machine requirements
Field Wiring	Verify existing connections
Field Regulation	Verify required operating range

The drive’s product configuration identifies the field supply as single-phase regulated.

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12. Frame C Construction

The 20P41AE675RA0NNN uses Frame C.

This is important when comparing it with lower-current models.

The 575 V regenerative family uses Frame B for the lower-current range through the 405 A configuration. The 540 A and 675 A models use Frame C, while the still-higher-current 810 A and above models move into Frame D.

Therefore, moving from a 405 A drive to the 675 A drive involves more than changing the electrical rating.

The physical installation must also be designed around the larger Frame C enclosure.

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13. IP20 / NEMA/UL Type Open Enclosure

The 20P41AE675RA0NNN uses an IP20, NEMA/UL Type Open enclosure configuration.

This type of drive is generally installed inside an appropriate electrical cabinet or control enclosure.

The enclosure should protect the drive from:

• Direct water.
• Excessive dust.
• Conductive contamination.
• Mechanical impact.
• Oil contamination.
• Corrosive industrial environments.
• Other environmental hazards.

The cabinet should also provide appropriate ventilation and thermal management.

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14. Conformal Coating

The drive is specified with conformal coating.

Conformal coating adds protective coverage to electronic assemblies and can provide additional resistance against certain environmental contaminants.

This is useful in industrial applications where humidity and contamination may be greater than in a clean electrical room.

However, conformal coating does not make the drive an outdoor or washdown-rated product.

The complete cabinet and installation environment must still meet the required environmental conditions.

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15. No HIM / Blank Plate

The 20P41AE675RA0NNN is supplied with No HIM / Blank Plate.

HIM refers to a Human Interface Module used for local drive interaction.

A blank-plate configuration is often suitable where the drive is integrated into a larger control system.

In such an arrangement, commissioning and operation may be performed through:

• External controls.
• PLC systems.
• Analog signals.
• Digital signals.
• Communication systems.
• Engineering tools.
• Remote operator interfaces.

This configuration can be particularly suitable for OEM equipment and centralized control cabinets.

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16. No Standard Communication Module

The catalog configuration does not include a standard communication module.

This should be taken into account when planning machine integration.

The drive can form part of a larger automation system, but the actual communication method should be determined from the complete machine design.

For an existing machine, the engineer should identify whether the current system uses:

• Hardwired control.
• Analog speed reference.
• Digital inputs.
• Digital outputs.
• PLC control.
• Network communication.
• External feedback.
• Remote operator stations.

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17. Product Applications

The 20P41AE675RA0NNN is designed for high-power industrial DC motor applications.

Typical application areas can include:

• Large winding machines.
• Unwinding equipment.
• Paper machinery.
• Printing and converting equipment.
• Steel-processing equipment.
• Metal-processing machinery.
• Large conveyors.
• Material-handling machinery.
• High-inertia machinery.
• Reversing machines.
• Large rolling equipment.
• Industrial test stands.
• Large machine tools.
• Existing high-power DC motor installations.
• Heavy production lines.

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18. Winding Machines

Large winding equipment can require substantial torque and precise speed control.

A winding machine may need to accelerate a large roll, maintain operating speed, slow the roll down, and occasionally reverse.

During deceleration, the mechanical energy stored in the roll can cause the motor to regenerate.

Four-quadrant regenerative control is well suited to this operating pattern.

The 675 A current rating also provides the capacity required by large motors used in heavy winding machinery.

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19. Unwinding Machines

Unwinding applications can be particularly demanding because the mechanical load can drive the motor.

The motor may need to provide controlled braking torque while the material roll continues rotating.

This can place the drive in a regenerative operating condition.

The four-quadrant architecture of the 20P41AE675RA0NNN provides the operating capability required for this type of bidirectional torque control.

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20. Paper and Converting Machinery

Paper machines and converting equipment can contain large rolls and rotating sections.

These systems often require coordinated speed control and controlled tension.

Large motors may repeatedly accelerate and decelerate as material moves through different machine sections.

The regenerative DC architecture can be useful where the motor repeatedly transitions between motoring and regenerative operation.

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21. Steel and Metal Processing

Heavy metal-processing machinery can require very high torque.

The connected DC motor may need to:

• Start under heavy load.
• Maintain stable speed.
• Accelerate rapidly.
• Decelerate under load.
• Reverse direction.
• Regenerate during braking.

The 675 A capacity makes the 20P41AE675RA0NNN suitable for evaluation in large industrial metal-processing systems where a compatible DC motor is already installed.

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22. Large Conveyor Systems

Large conveyors may contain significant mechanical inertia.

The motor must provide enough torque to accelerate the conveyor and its load.

During deceleration, the mechanical system may drive the motor.

A regenerative drive can manage this energy flow.

For a large conveyor, the actual suitability depends on:

• Conveyor length.
• Belt mass.
• Product mass.
• Starting load.
• Operating speed.
• Acceleration time.
• Deceleration time.
• Motor rating.
• Braking requirements.
• Regenerative energy.

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23. High-Inertia Machinery

High-inertia applications are a natural area for regenerative operation.

Examples include:

• Large rolls.
• Flywheels.
• Drums.
• Large fans.
• Heavy rotating equipment.
• Large processing machinery.

When these loads decelerate, substantial mechanical energy must be managed.

The regenerative architecture of the 20P41AE675RA0NNN provides an appropriate control concept for applications where this energy flow occurs repeatedly.

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24. Reversing Machinery

A four-quadrant drive can be particularly useful for reversing machines.

The operating sequence can involve:

Forward motoring → regenerative braking → zero speed → reverse motoring.

The reverse process can also occur when the machine changes direction again.

For large industrial machinery, controlled transitions between these states can be important for both production performance and mechanical stress management.

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25. Existing DC Motor Retrofit Applications

Another important application is modernization of an existing DC motor installation.

Many older industrial machines continue to use large DC motors because the motor is mechanically integrated into the machine.

Replacing the motor may require:

• New motor mounting.
• Shaft modifications.
• Coupling modifications.
• Mechanical redesign.
• New feedback equipment.
• New cabling.
• Machine control modifications.

In such cases, upgrading the drive can be considered as part of a broader modernization project.

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26. Main Product Advantages

High 675 A Current Capacity

The 675 A output rating is the central characteristic of this model.

It provides the electrical capacity required for large DC motors in the 500 HP class.

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500 HP / 373 kW Power Class

The 20P41AE675RA0NNN is designed around the 500 HP / 373 kW motor power class.

This places it firmly in the heavy industrial drive category.

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Four-Quadrant Operation

The drive supports forward and reverse motoring as well as regenerative operation.

This provides substantial flexibility for machines requiring reversing and controlled braking.

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Regenerative Braking

The regenerative design is useful for applications where mechanical energy is frequently returned through the motor during deceleration.

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Large DC Motor Support

The drive is designed specifically for high-power DC motor applications.

This is particularly relevant to industrial installations where the existing motor is still an important part of the machine.

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Regulated Field Supply

The regulated field supply supports conventional DC motor field-control requirements.

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Conformal Coating

Conformal coating provides additional protection to electronic assemblies in appropriate industrial environments.

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Frame C High-Power Construction

Frame C provides a larger mechanical platform for high-current applications.

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Industrial Control Cabinet Integration

The IP20 / NEMA/UL Type Open configuration is appropriate for integration into a properly designed electrical cabinet.

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27. Five Recommended Same-Series or Closely Related Models

The following models are closely related to the 20P41AE675RA0NNN and can be useful when comparing different current and power requirements.

Model	Voltage Class	Current	Motor HP	Motor kW	Operation	Frame	Approx. Dimensions	Weight
20P41AE405RA0NNN	500…600 V AC	405 A	300 HP	224 kW	4-Quadrant Regenerative	B	311 × 388 × 350 mm	32 kg
20P41AE540RA0NNN	500…600 V AC	540 A	400 HP	298 kW	4-Quadrant Regenerative	C	521 × 511 × 416 mm	72 kg
20P41AE675RA0NNN	500…600 V AC	675 A	500 HP	373 kW	4-Quadrant Regenerative	C	521 × 511 × 416 mm	72 kg
20P41AE810RA0NNN	500…600 V AC	810 A	600 HP	447 kW	4-Quadrant Regenerative	D	Configuration-dependent	Configuration-dependent
20P41AE1K0RA0NNN	500…600 V AC	1080 A	800 HP	597 kW	4-Quadrant Regenerative	D	Configuration-dependent	Configuration-dependent

The 575 V regenerative family includes 405 A, 540 A, 675 A, 810 A, 1080 A and larger configurations. The 675 A model therefore sits in the high-current portion of the same product family.

For the Frame C models, the published mechanical envelope is approximately 521 × 511 × 416 mm. The Frame B 405 A model has the smaller approximately 311 × 388 × 350 mm envelope.

For the 810 A and larger Frame D models, exact dimensions and weight should be checked against the particular mechanical configuration before purchasing or designing a replacement cabinet.

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28. Same-Series Electrical Comparison

Model	Current	Motor Power	kW	Frame	Regenerative
20P41AE405RA0NNN	405 A	300 HP	224 kW	B	Yes
20P41AE540RA0NNN	540 A	400 HP	298 kW	C	Yes
20P41AE675RA0NNN	675 A	500 HP	373 kW	C	Yes
20P41AE810RA0NNN	810 A	600 HP	447 kW	D	Yes
20P41AE1K0RA0NNN	1080 A	800 HP	597 kW	D	Yes

The progression demonstrates the main selection principle within this family: current capacity increases together with motor power capability, while the physical frame changes as the drive rating becomes larger.

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29. Five Same-Brand Related Models

The following models are related Allen-Bradley PowerFlex products that can be considered in broader DC-drive or modernization projects.

They are not direct drop-in replacements for the 20P41AE675RA0NNN.

Model	Product Family	Drive Type	Voltage / Rating Class	Current / Power	Dimensions	Weight
20P21AE675RA0NNN	PowerFlex DC	Non-Regenerative DC Drive	575 V AC class	675 A / 500 HP / 373 kW	521 × 511 × 416 mm	68 kg
20P41AE540RA0NNN	PowerFlex DC	Regenerative DC Drive	575 V AC class	540 A / 400 HP / 298 kW	521 × 511 × 416 mm	72 kg
20P41AE405RA0NNN	PowerFlex DC	Regenerative DC Drive	575 V AC class	405 A / 300 HP / 224 kW	311 × 388 × 350 mm	32 kg
20P41AE810RA0NNN	PowerFlex DC	Regenerative DC Drive	575 V AC class	810 A / 600 HP / 447 kW	Configuration-dependent, Frame D	Configuration-dependent
20P41AE1K0RA0NNN	PowerFlex DC	Regenerative DC Drive	575 V AC class	1080 A / 800 HP / 597 kW	Configuration-dependent, Frame D	Configuration-dependent

The 20P21AE675RA0NNN is the closely related non-regenerative 675 A model, while the 20P41AE540RA0NNN and 20P41AE405RA0NNN are lower-current regenerative configurations. The 810 A and 1080 A models provide higher-current options within the same regenerative family.

For the 675 A non-regenerative model, the Frame C technical data lists approximately 68 kg for the drive and approximately 90 kg for the drive and packaging.

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30. 20P41AE675RA0NNN Versus 20P41AE540RA0NNN

The 540 A model is the closest lower-current regenerative configuration.

Parameter	540 A Model	675 A Model
Model	20P41AE540RA0NNN	20P41AE675RA0NNN
Current	540 A	675 A
Motor Power	400 HP	500 HP
Motor Power	298 kW	373 kW
Frame	C	C
Approx. Dimensions	521 × 511 × 416 mm	521 × 511 × 416 mm
Approx. Drive Weight	72 kg	72 kg
Regenerative	Yes	Yes
Four Quadrant	Yes	Yes
Field Supply	Regulated	Regulated

Both models use the Frame C mechanical platform and have the same published main dimensional envelope and 72 kg drive weight in the applicable 575 V regenerative rating group.

The major difference is the electrical capacity: the 675 A model provides the higher current and approximately 500 HP power class.

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31. 20P41AE675RA0NNN Versus 20P41AE405RA0NNN

The 405 A model is a lower-current Frame B drive.

Parameter	405 A Model	675 A Model
Model	20P41AE405RA0NNN	20P41AE675RA0NNN
Current	405 A	675 A
Motor Power	300 HP	500 HP
Motor Power	224 kW	373 kW
Frame	B	C
Height	311 mm	521 mm
Width	388 mm	511 mm
Depth	350 mm	416 mm
Drive Weight	32 kg	72 kg
Regenerative	Yes	Yes
Four Quadrant	Yes	Yes

This comparison demonstrates why a 675 A replacement cannot simply be assumed to occupy the same cabinet space as a 405 A model.

The larger electrical rating is accompanied by a substantially larger physical package.

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32. 20P41AE675RA0NNN Versus 20P41AE810RA0NNN

The 810 A model is the next higher current class.

Parameter	675 A Model	810 A Model
Model	20P41AE675RA0NNN	20P41AE810RA0NNN
Current	675 A	810 A
Motor Power	500 HP	600 HP
Motor Power	373 kW	447 kW
Frame	C	D
Operation	Regenerative	Regenerative
Four Quadrant	Yes	Yes
Dimensions	521 × 511 × 416 mm	Frame D / configuration-dependent
Weight	72 kg	Configuration-dependent

The transition from 675 A to 810 A also represents a transition from Frame C to Frame D.

This means the higher-current model requires a different mechanical installation approach.

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33. Cabinet Design

The cabinet requirements for a 675 A drive deserve careful consideration.

The drive itself is approximately 521 mm high, 511 mm wide, and 416 mm deep.

However, the cabinet cannot simply be built to those exact dimensions.

Additional space may be required for:

• Incoming power cables.
• Motor cables.
• Field cables.
• Control wiring.
• Feedback wiring.
• Grounding conductors.
• Terminal access.
• Ventilation.
• Heat removal.
• Maintenance.
• Electrical clearances.
• Cable bending radius.
• Protection devices.
• Line reactors.
• Contactors.

The final cabinet dimensions should therefore be established from the complete installation design.

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34. Thermal Management

A 675 A drive can produce significant heat during operation.

Thermal management is therefore an important part of the installation.

Potential cabinet considerations include:

• Forced-air ventilation.
• Heat exchangers.
• Air-conditioning systems.
• Controlled electrical rooms.
• External cooling arrangements.
• Temperature monitoring.
• Separation from other high-heat equipment.

The actual heat-loss calculation should be based on the complete drive operating condition and installation configuration.

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35. Power Wiring

The 20P41AE675RA0NNN requires a substantial electrical installation.

Power wiring must be selected according to:

• Input current.
• Motor current.
• Field current.
• Ambient temperature.
• Cable installation method.
• Cable length.
• Short-circuit rating.
• Protective device requirements.
• Terminal arrangement.
• Local electrical regulations.

At this current level, cable termination quality is particularly important.

Loose or improperly sized connections can produce excessive heat and reliability problems.

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36. Motor Compatibility

The 675 A rating does not mean that every 500 HP DC motor is automatically compatible.

Before installation, the motor nameplate should be reviewed.

Motor Characteristic	Required Verification
Armature Voltage	Verify
Armature Current	Verify against 675 A drive capability
Motor Power	Approximately 500 HP class
Motor Field Voltage	Verify
Motor Field Current	Verify
Base Speed	Verify
Maximum Speed	Verify
Feedback	Verify
Duty Cycle	Verify
Overload Requirements	Verify
Cooling Method	Verify
Direction of Rotation	Verify
Braking Requirements	Verify

A proper engineering review should be completed before connecting a large DC motor to the drive.

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37. Feedback System

Large DC motor applications often use feedback for accurate speed regulation.

The existing machine may use:

• Tachometer feedback.
• Encoder feedback.
• Digital feedback.
• Analog feedback.

The feedback device must be compatible with the intended drive-control arrangement.

During a retrofit, feedback wiring is one of the areas that should be inspected carefully.

Incorrect scaling, wiring, polarity, or feedback selection can cause unstable operation or incorrect speed control.

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38. Maintenance Considerations

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

Typical maintenance activities can include:

• Inspecting the cabinet.
• Checking ventilation.
• Cleaning contamination.
• Inspecting electrical terminals.
• Checking grounding.
• Reviewing fault history.
• Inspecting control wiring.
• Checking feedback wiring.
• Checking motor connections.
• Inspecting cooling equipment.
• Checking field connections.
• Verifying protective equipment.

Maintenance frequency should be adjusted according to the actual operating environment.

A dusty production area may require a different maintenance interval from a clean electrical room.

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39. Spare Parts Planning

For large production machinery, spare-parts planning can be important.

A 500 HP DC motor installation may support a significant production process.

Depending on the machine’s criticality, maintenance planners may consider spare inventory for:

• Control electronics.
• Power electronics.
• Cooling components.
• Interface components.
• Feedback components.
• Fuses.
• Contactors.
• Auxiliary components.
• Control relays.

The exact spare-parts list should be based on the actual drive configuration and machine design.

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40. Application Selection Checklist

Selection Item	Requirement
Catalog Number	20P41AE675RA0NNN
Brand	Allen-Bradley
Product Family	PowerFlex DC
Drive Type	Regenerative DC Drive
Input Voltage Class	500…600 V AC
Nominal Voltage Class	575 V AC
Input Phase	3 Phase
Input Type	6 Pulse
Output Current	675 A
Motor Rating	500 HP
Motor Rating	373 kW
Motor Operation	Four Quadrant Regenerative
Frame	C
Enclosure	IP20 / NEMA/UL Type Open
Field Supply	Single-Phase Regulated
Conformal Coating	Yes
HIM	Blank Plate / No HIM
Standard Communication	None
Height	521 mm
Width	511 mm
Depth	416 mm
Drive Weight	72 kg
Packaged Weight	94 kg

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41. Practical Application Example – Large Winding Machine

Consider a 500 HP DC motor driving a large winding machine.

During startup, the drive supplies current to accelerate the motor.

As the machine reaches operating speed, the drive maintains the required speed and torque.

When the winding section needs to slow down, the motor can enter regenerative operation.

The drive controls the braking torque and manages the regenerated energy.

If the machine needs to reverse, the motor can transition through controlled regenerative braking and then into reverse motoring.

This is a typical operating concept for which four-quadrant regenerative DC control can be valuable.

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42. Practical Application Example – Large Roll Drive

A large roll can contain significant rotational energy.

When the roll is accelerated, the motor provides torque.

When the roll is decelerated, the mechanical system can return energy through the motor.

The regenerative drive controls this energy flow.

For a large roll-processing machine, this can be more appropriate than designing the braking system solely around dissipative resistance.

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43. Practical Application Example – Reversing Industrial Machine

A large reversing machine may repeatedly change direction.

A typical sequence can be:

Forward acceleration → forward operation → regenerative braking → zero speed → reverse acceleration → reverse operation.

The same sequence can occur in the opposite direction.

A four-quadrant regenerative drive is designed around this type of motor-control requirement.

The 675 A model provides the current capacity for large motors used in high-power versions of such machinery.

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44. Practical Application Example – Existing DC Motor Modernization

Suppose a production machine has a 500 HP DC motor that remains mechanically suitable.

The existing drive may be aging while the motor, gearbox, coupling, and mechanical system remain usable.

A DC-drive modernization project can focus on replacing the drive and updating the control system while retaining the existing motor.

This can potentially reduce the amount of mechanical modification compared with a complete DC-to-AC motor conversion.

However, the motor, field system, feedback device, power system, and machine controls must all be reviewed before final selection.

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45. Why the 20P41AE675RA0NNN Is a High-Power Model

The combination of 675 A, 500 HP, 373 kW, and Frame C clearly places this drive in the high-power section of the PowerFlex DC product family.

It is not simply a larger version of a small industrial drive.

The machine designer needs to consider the complete electrical system.

This includes the transformer, incoming switchgear, line reactor, AC contactor, DC motor, motor cables, field supply, control system, feedback, cabinet cooling, and grounding system.

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46. Electrical System Considerations

The published selection information for the 575 V regenerative family associates the 675 A model with approximately 551.5 A AC line current and a 500 HP / 373 kW motor power class.

This provides a useful indication of the scale of the associated electrical installation.

At this level, incoming switchgear and protection should be engineered rather than selected only from the DC output current.

The complete system must take into account the actual motor duty and site electrical characteristics.

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47. Comparison With the Non-Regenerative Version

A closely related model is the 20P21AE675RA0NNN.

It uses the same 675 A / 500 HP power class but is the non-regenerative configuration.

Parameter	Regenerative Model	Non-Regenerative Model
Model	20P41AE675RA0NNN	20P21AE675RA0NNN
Current	675 A	675 A
Motor Power	500 HP	500 HP
Motor Power	373 kW	373 kW
Voltage Class	575 V AC	575 V AC
Frame	C	C
Regeneration	Yes	No
Four-Quadrant Regenerative Operation	Yes	No
Approx. Dimensions	521 × 511 × 416 mm	521 × 511 × 416 mm
Drive Weight	72 kg	68 kg

The primary functional distinction is the regenerative architecture.

For a machine requiring controlled regenerative braking and four-quadrant operation, the regenerative model is the configuration that provides that operating capability.

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48. PowerFlex DC Family Selection

The 575 V regenerative family can be viewed as a progression of current and motor power ratings.

Model	Current	HP	kW	Frame
20P41AE067RA0NNN	67.5 A	50 HP	37 kW	B
20P41AE101RA0NNN	101.3 A	75 HP	56 kW	B
20P41AE135RA0NNN	135 A	100 HP	75 kW	B
20P41AE270RA0NNN	270 A	200 HP	149 kW	B
20P41AE405RA0NNN	405 A	300 HP	224 kW	B
20P41AE540RA0NNN	540 A	400 HP	298 kW	C
20P41AE675RA0NNN	675 A	500 HP	373 kW	C
20P41AE810RA0NNN	810 A	600 HP	447 kW	D
20P41AE1K0RA0NNN	1080 A	800 HP	597 kW	D
20P41AE1K2RA0NNN	1215 A	900 HP	671 kW	D
20P41AE1K3RA0NNN	1350 A	1000 HP	746 kW	D
20P41AE1K6RA0NNN	1688 A	1250 HP	932 kW	D

This table shows that the 675 A model is directly positioned between the 540 A and 810 A configurations.

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49. Mechanical Comparison

Model	Frame	Height	Width	Depth	Drive Weight
20P41AE405RA0NNN	B	311 mm	388 mm	350 mm	32 kg
20P41AE540RA0NNN	C	521 mm	511 mm	416 mm	72 kg
20P41AE675RA0NNN	C	521 mm	511 mm	416 mm	72 kg
20P41AE810RA0NNN	D	Configuration-dependent	Configuration-dependent	Configuration-dependent	Configuration-dependent

The most noticeable mechanical change occurs between the 405 A Frame B design and the 540/675 A Frame C designs.

The 540 A and 675 A models share the Frame C mechanical envelope.

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50. Product Advantages in Heavy Industrial Applications

Advantage	Practical Significance
675 A Capacity	Supports large high-power DC motors
500 HP Class	Suitable for heavy industrial machinery
373 kW Class	Large power capability
Four-Quadrant Control	Allows forward/reverse motoring and regeneration
Regenerative Braking	Useful for high-inertia machinery
Regulated Field Supply	Supports conventional DC motor field systems
Frame C	Provides high-power mechanical platform
Conformal Coating	Additional protection for electronics
IP20 Construction	Suitable for electrical cabinet integration
No HIM Configuration	Suitable for centralized control architectures
DC Motor Compatibility	Useful for existing high-power DC systems
High-Current Design	Suitable for demanding industrial duty

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51. Important Engineering Considerations

The 20P41AE675RA0NNN should be selected based on the complete machine rather than horsepower alone.

A proper engineering review should include:

• Motor nameplate.
• Armature voltage.
• Armature current.
• Field voltage.
• Field current.
• Base speed.
• Maximum speed.
• Duty cycle.
• Acceleration time.
• Deceleration time.
• Regenerative energy.
• Feedback type.
• Control method.
• AC supply.
• Transformer capacity.
• Line reactor requirements.
• Protective devices.
• Cabinet cooling.
• Ambient temperature.
• Environmental conditions.
• Mechanical load.
• Machine inertia.
• Reversing requirements.

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52. Final Product Summary

The Allen-Bradley 20P41AE675RA0NNN is a high-power PowerFlex DC regenerative drive designed for industrial applications requiring a large DC motor and substantial current capacity.

Its primary electrical rating is 675 A, corresponding to approximately 500 HP / 373 kW in the 575 V AC three-phase product family.

The drive uses a six-pulse input, four-quadrant regenerative operation, and a single-phase regulated field supply. Its standard configuration includes an IP20 / NEMA/UL Type Open enclosure, conformal coating, a blank plate instead of a HIM, and no standard communication module.

Mechanically, it is a Frame C drive.

The main mechanical envelope is approximately 521 mm high × 511 mm wide × 416 mm deep, with a drive weight of approximately 72 kg and a packaged weight of approximately 94 kg.

The model is particularly suitable for large winding machines, unwinding systems, paper-processing machinery, metal-processing equipment, large conveyors, reversing machines, high-inertia machinery, and existing high-power DC motor installations.

Its most important functional characteristic is four-quadrant regenerative operation.

That capability allows the drive to control forward motoring, reverse motoring, and regenerative braking conditions, making it appropriate for machines in which the motor repeatedly changes between driving and braking modes.

For users comparing nearby models, the 20P41AE540RA0NNN provides 540 A / 400 HP / 298 kW, while the 20P41AE675RA0NNN provides 675 A / 500 HP / 373 kW. The next larger model, 20P41AE810RA0NNN, moves into the 810 A / 600 HP / 447 kW class and uses Frame D.

From a mechanical standpoint, the 675 A model shares the Frame C platform with the 540 A model, while the 405 A model uses the smaller Frame B construction.

This distinction is important when planning a retrofit because increasing drive current can require significantly more cabinet space, heavier wiring, different protective equipment, and additional thermal-management capacity.

For existing DC motor systems, the 20P41AE675RA0NNN can be considered as a high-power drive solution where retaining the existing DC motor is technically and mechanically appropriate.

The most important specifications to remember are:

675 A output current, 500 HP, 373 kW, 575 V AC class, three-phase input, six-pulse input, four-quadrant regenerative operation, regulated field supply, Frame C construction, IP20 / NEMA/UL Type Open enclosure, approximately 521 × 511 × 416 mm dimensions, approximately 72 kg drive weight, and approximately 94 kg packaged weight.

For a high-power industrial DC motor installation, these specifications place the 20P41AE675RA0NNN firmly in the large-capacity section of the PowerFlex DC family.