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1. Product Overview

The Allen-Bradley 20P41AD250RA0NNN is a high-power regenerative DC drive belonging to the PowerFlex DC series. It is designed for industrial applications that require controlled DC motor speed, torque, acceleration, deceleration, reversing, and regenerative operation.

This model is rated for a 480 VAC-class, three-phase AC input, with a 250 A DC output rating and a 150 HP motor rating. It uses a six-pulse input architecture and supports four-quadrant regenerative motor operation, making it suitable for machinery where the motor must not only produce torque but also return energy to the drive system during controlled deceleration or overhauling conditions.

The 20P41AD250RA0NNN is configured as an IP20, NEMA/UL Type Open drive with conformal coating. This type of construction is intended for installation inside an appropriately designed electrical cabinet or control enclosure rather than for direct exposure to harsh outdoor environments.

The product configuration includes a blank plate instead of a Human Interface Module and does not include a communication module as standard. This makes the unit suitable for control architectures where the drive is integrated into an existing control panel and operated through external control equipment or the machine’s existing automation system.

2. Brand and Product Series

Item	Specification
Brand	Allen-Bradley
Product Series	PowerFlex DC
Product Type	DC Drive
Model / Catalog Number	20P41AD250RA0NNN
Drive Category	Regenerative DC Drive
Motor Technology	DC Motor
Rated Motor Power	150 HP / approximately 112 kW
Input Voltage Class	460/480 VAC
Input Phase	Three Phase
Input Configuration	6 Pulse
Output Current	250 A
Motor Operation	Four-Quadrant / Regenerative
Frame Size	Frame B
Enclosure	IP20, NEMA/UL Type Open
Coating	Conformal Coating
Field Supply	Single-Phase Regulated
HIM	No HIM, Blank Plate
Communication Module	None as standard

The model belongs to the PowerFlex DC family rather than the PowerFlex low-voltage AC drive families. Its architecture is specifically intended for applications involving DC motors and for modernization projects in which an existing DC motor installation needs a contemporary digital drive platform.

3. Main Technical Parameters

Parameter	Specification
Model / Catalog Number	20P41AD250RA0NNN
Brand	Allen-Bradley
Series	PowerFlex DC
Product Type	Regenerative DC Drive
Rated Input Voltage	480 VAC class
Input Voltage Range / Class	380–480 VAC class
Input Phase	3 Phase
Input Type	6 Pulse
Rated Output Current	250 A
Motor Rating	150 HP
Motor Rating	Approximately 112 kW
Motor Operation	Four-Quadrant Operation – Regenerative
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 Module	None as standard
Mounting	Panel / Surface Mounting
Approximate Dimensions H × W × D	311 × 388 × 350 mm
Approximate Weight	29.5 kg
Typical Application	High-power DC motor control
Typical Installation	Industrial control cabinet

The published product configuration identifies the unit as a 480 VAC, three-phase, 250 A, 150 HP PowerFlex DC drive with Frame B construction and four-quadrant regenerative operation.

The physical dimensions commonly listed for this Frame B configuration are approximately 311 mm high × 388 mm wide × 350 mm deep, with an approximate product weight of 29.5 kg. Actual shipping dimensions and packaged weight can be different from the installed product dimensions and weight.

4. Electrical Input

The 20P41AD250RA0NNN is designed for a three-phase AC input in the 460/480 V class. The six-pulse input configuration provides the rectification architecture used by the drive to convert the incoming AC supply into the DC power required by the DC motor control section.

For an industrial installation, the incoming supply should be evaluated together with the drive’s rated current, motor rating, protection equipment, disconnect arrangement, grounding method, line impedance, cabinet design, and applicable installation requirements.

The nominal 480 VAC input specification is particularly relevant when replacing or modernizing older DC drive systems installed on conventional industrial three-phase power distribution systems.

5. 250 Amp Output Capability

One of the most important characteristics of the 20P41AD250RA0NNN is its 250 A output-current rating.

This places the model in the higher-power section of the 460/480 V PowerFlex DC product range. It is intended for large DC motor installations where a small or medium-size drive would not provide sufficient current capacity.

The 250 A rating is also what distinguishes this model from nearby PowerFlex DC models such as the 167 A and 207 A versions. The PowerFlex DC selection structure progresses through different current and motor-power ratings while maintaining the same general DC-drive platform.

6. 150 HP Motor Rating

The 20P41AD250RA0NNN is associated with a 150 HP motor rating, equivalent to approximately 112 kW.

A 150 HP DC motor is substantially larger than the motors normally handled by compact general-purpose drives. This means that the drive is particularly relevant to large production machinery, heavy material-handling systems, processing equipment, winding equipment, and other industrial machines where high motor torque and controlled speed are required.

Motor selection should still be based on the actual motor nameplate data and application requirements rather than simply matching the horsepower number. Armature voltage, armature current, field requirements, motor base speed, maximum speed, feedback device, load characteristics, acceleration requirements, and regeneration requirements all need to be considered.

7. Four-Quadrant Regenerative Operation

The 20P41AD250RA0NNN supports four-quadrant regenerative motor operation. This is one of the defining characteristics of the model.

In a conventional motoring condition, electrical energy is converted into mechanical energy by the motor.

During controlled deceleration or an overhauling load condition, the motor can instead act as a generator. Mechanical energy is converted back into electrical energy, and the regenerative drive architecture manages this energy through the drive system.

Four-quadrant operation is especially valuable for machinery that frequently changes direction or speed, because the motor may repeatedly move between motoring and regenerative states.

Typical examples include winding machines, unwind stands, elevators, hoists, high-inertia processing machinery, reversing mills, and other systems where controlled deceleration is a significant part of normal operation.

8. Regenerative Braking Capability

Regenerative operation is particularly useful where a machine contains substantial rotating inertia.

A large roll, reel, drum, shaft, flywheel, or other rotating assembly can store a considerable amount of mechanical energy. When the machine decelerates, that energy has to go somewhere.

With a suitable regenerative drive architecture, the braking energy can be handled electrically rather than relying exclusively on conventional mechanical braking or dissipative braking methods.

This can make the control system more suitable for repeated acceleration and deceleration cycles.

The actual energy flow, braking performance, and system efficiency depend on the motor, mechanical load, drive configuration, incoming electrical system, operating cycle, and application design.

9. Frame Size and Mechanical Construction

The 20P41AD250RA0NNN is a Frame B PowerFlex DC drive. The Frame B designation is important when planning the control cabinet because it provides a reference for mechanical arrangement, mounting, airflow, and service access.

The approximate product dimensions are:

311 mm H × 388 mm W × 350 mm D

The approximate product weight is:

29.5 kg

The dimensions should be considered together with the cabinet’s required wiring space, incoming and outgoing cable routing, ventilation, service clearance, grounding connections, and access to terminals.

For replacement projects, the available panel space should be measured before selecting the replacement drive. Even when two drives have similar electrical ratings, the physical arrangement of terminals, ventilation paths, mounting points, and cable-entry areas can affect the final cabinet design.

10. Enclosure and Conformal Coating

The model uses an IP20, NEMA/UL Type Open enclosure configuration with conformal coating.

IP20 construction means the drive should normally be installed within an appropriate electrical enclosure rather than being treated as a completely enclosed outdoor product.

The conformal coating provides additional protection for the electronic assemblies against environmental contamination compared with an untreated electronic assembly. Nevertheless, proper cabinet design remains important.

The control cabinet should be designed with suitable temperature management, airflow, contamination control, cable routing, grounding, and electrical separation.

11. Field Supply

The model uses a single-phase regulated field supply.

The field supply is an important part of a DC motor system because the motor’s field circuit directly affects motor operating characteristics.

When replacing an older DC drive, engineers should check the existing motor field voltage and current against the requirements of the new drive configuration.

It is also important to distinguish between separately excited DC motors and other motor arrangements when performing a retrofit. The field circuit should not be treated as an incidental connection; it is part of the overall motor-control system.

12. Feedback and Speed Regulation

PowerFlex DC applications can be configured for feedback-based speed regulation, including DC tachometer and encoder feedback arrangements depending on the system configuration.

Feedback becomes especially important when the machine requires precise speed regulation under changing load conditions.

For example, a production line may need a motor to maintain a relatively stable speed while the mechanical load changes. In this situation, the control system can use feedback information to determine the actual motor speed and adjust the drive command accordingly.

Feedback is also useful for machines involving synchronized motion, tension control, winding, unwinding, and other processes where motor speed directly affects product quality.

13. Product Introduction

The Allen-Bradley 20P41AD250RA0NNN is essentially a high-power digital DC motor control platform designed around a combination of substantial current capacity, regenerative operation, regulated field control, and industrial cabinet integration.

Its 250 A rating and 150 HP motor class make it suitable for large DC motor applications rather than small machine drives.

The drive is particularly relevant in plants where DC motors remain mechanically suitable and where replacing the complete motor and mechanical transmission would be unnecessarily disruptive.

A DC motor can have a long service life when properly maintained. In many industrial machines, the mechanical system, gearbox, shafting, rolls, bearings, couplings, and motor are still usable even when the original drive electronics have become outdated.

In such cases, replacing the drive while retaining the existing motor and machine can provide a practical modernization route.

14. DC Motor Retrofit Applications

One of the major application areas for the 20P41AD250RA0NNN is DC motor retrofit work.

Many older industrial machines were originally equipped with analog DC drives or earlier-generation digital DC controllers.

When those controllers become difficult to maintain, the drive can become a significant source of downtime.

A modern PowerFlex DC drive can provide a new control platform while allowing the existing DC motor and mechanical equipment to remain in service, provided the motor and associated electrical equipment are compatible with the new drive.

A proper retrofit should include an inspection of:

• Motor armature voltage
• Motor armature current
• Motor field voltage
• Motor field current
• Motor speed range
• Motor feedback device
• Encoder or tachometer wiring
• Mechanical load
• Acceleration requirements
• Deceleration requirements
• Regenerative operation
• Existing cabinet dimensions
• Incoming power
• Grounding arrangement
• Protection equipment
• Control signals
• Communication requirements

15. Applications in Material Handling

The 20P41AD250RA0NNN can be used in large material-handling equipment where controlled motor acceleration, deceleration, and speed regulation are required.

Potential applications include large conveyors, processing lines, lifting-related machinery, transfer systems, and other equipment using high-power DC motors.

A major consideration in these systems is inertia.

A heavily loaded conveyor or large rotating mechanism does not stop immediately when the drive command is removed. The drive must control the transition from motoring to deceleration while maintaining appropriate speed and torque behavior.

The regenerative characteristics of the drive are therefore relevant to applications where controlled braking occurs frequently.

16. Winding and Unwinding Machinery

Winding and unwinding machinery is another important application area for high-performance DC drive systems.

A winding machine often needs to maintain controlled motor speed while the diameter of a roll changes.

An unwinding machine can also experience changing mechanical conditions as material is removed from the roll.

These applications may require coordinated control of speed and torque, as well as feedback from tachometers or encoders.

The four-quadrant nature of the drive is useful when the motor must alternate between driving and regenerative conditions during different phases of the process.

17. Metal Processing

Large DC motors have historically been used in many metal-processing applications because of their controllability and torque characteristics.

Potential equipment includes rolling, finishing, drawing, tension-control, coating, and other continuous-processing machinery.

The 20P41AD250RA0NNN can be considered for such systems when the existing motor and mechanical installation remain appropriate.

For a retrofit, the key issue is not simply whether the drive is rated at 150 HP. The complete motor-drive-load relationship needs to be evaluated.

18. Paper and Converting Machinery

Paper-processing and converting equipment can require highly controlled motor operation.

Machines may involve large rolls, winding systems, unwind systems, tension zones, coating systems, cutting systems, and continuous material transport.

The drive’s regenerative capability can be useful when the motor repeatedly accelerates and decelerates large rotating masses.

Feedback-based control can also help maintain stable motor speed when mechanical conditions change.

19. Printing and Continuous Production Machinery

Continuous production machinery often places greater demands on speed regulation than simple intermittent machinery.

In a continuous process, small speed variations can affect material tension, coating thickness, product dimensions, or synchronization between different machine sections.

A high-power DC drive such as the 20P41AD250RA0NNN can therefore be used where a large DC motor remains part of an established production system.

20. High-Inertia Machinery

High-inertia loads are one of the clearest situations where regenerative drive architecture can become important.

Examples include:

• Large rolls
• Large drums
• Flywheels
• Reels
• Heavy rotating assemblies
• Large conveyors
• Processing rollers
• High-speed rotating machinery

During acceleration, the drive supplies energy to the motor.

During deceleration, the rotating equipment releases stored mechanical energy.

The regenerative drive provides a controlled electrical path for that energy rather than relying only on mechanical braking or energy dissipation.

21. Reversing Applications

Four-quadrant operation also makes the model suitable for machinery that repeatedly changes direction.

A reversing process may involve:

1. Forward acceleration.
2. Forward constant-speed operation.
3. Controlled deceleration.
4. Transition through zero speed.
5. Reverse acceleration.
6. Reverse operation.
7. Regenerative deceleration.
8. Repetition of the cycle.

This type of operating profile can place significant demands on the drive and motor.

The regenerative DC architecture of the 20P41AD250RA0NNN is designed for this type of operating environment.

22. Main Product Advantages

High Current Capacity

The 250 A output rating allows the drive to serve substantially larger DC motor applications than smaller PowerFlex DC models.

This makes the model relevant to large industrial machinery where high motor current is required.

150 HP Motor Class

The 150 HP rating provides a practical solution for large DC motor installations.

It occupies an important position in the PowerFlex DC 460/480 V range between the 125 HP and 200 HP classes.

Four-Quadrant Operation

Four-quadrant operation allows the motor to transition between motoring and regenerative conditions.

This is especially useful in machinery with frequent deceleration, reversing, or overhauling loads.

Regenerative Capability

Regenerative operation can be valuable in applications where significant mechanical energy is returned to the electrical system during deceleration.

This is particularly relevant to high-inertia industrial machines.

Regulated Field Supply

The integrated regulated field-supply arrangement supports DC motor applications that require controlled field operation.

Industrial Frame B Construction

The Frame B mechanical platform provides a defined physical format for cabinet engineering and system integration.

Conformal Coating

The conformal-coated construction provides additional environmental protection for the electronics compared with an untreated electronic assembly.

Suitable for DC Motor Modernization

For plants with existing DC motors, the drive provides an option for updating the electronic control system without necessarily replacing the complete motor and mechanical machine.

23. Five Recommended Same-Series Models

The following models are from the same PowerFlex DC regenerative family and are useful when comparing different motor-current requirements.

Model / Catalog Number	Input Voltage Class	Output Current	Motor Power	Frame	Operation	Approx. Dimensions	Weight
20P41AD129RA0NNN	460/480 VAC, 3 PH	129 A	75 HP / 56 kW	A	Four-quadrant regenerative	Approx. 359 × 267 × 287 mm	Approx. 14.5 kg
20P41AD167RA0NNN	460/480 VAC, 3 PH	167 A	100 HP / 75 kW	B	Four-quadrant regenerative	Frame B; configuration-dependent	Configuration-dependent
20P41AD207RA0NNN	460/480 VAC, 3 PH	207 A	125 HP / 93 kW	B	Four-quadrant regenerative	Approx. 311 × 388 × 350 mm	Configuration-dependent
20P41AD330RA0NNN	460/480 VAC, 3 PH	330 A	200 HP / 149 kW	B	Four-quadrant regenerative	Frame B; configuration-dependent	Configuration-dependent
20P41AD412RA0NNN	460/480 VAC, 3 PH	412 A	250 HP / 187 kW	B	Four-quadrant regenerative	Frame B; configuration-dependent	Configuration-dependent

The 460/480 V PowerFlex DC regenerative range progresses through 129 A, 167 A, 207 A, 250 A, 330 A, 412 A and larger current classes. The 250 A model therefore sits between the 207 A / 125 HP class and the 330 A / 200 HP class.

For the related models, dimensions and weights should be confirmed against the exact catalog configuration and mechanical drawing before cabinet fabrication. The physical dimensions of a drive should not be inferred solely from its current rating.

24. Same-Series Model Comparison

Model	Current	Motor Rating	Frame	Typical Selection Position
20P41AD129RA0NNN	129 A	75 HP / 56 kW	A	Lower power
20P41AD167RA0NNN	167 A	100 HP / 75 kW	B	Lower than 20P41AD250RA0NNN
20P41AD207RA0NNN	207 A	125 HP / 93 kW	B	Closest lower-current class
20P41AD250RA0NNN	250 A	150 HP / 112 kW	B	Main model
20P41AD330RA0NNN	330 A	200 HP / 149 kW	B	Higher-current class
20P41AD412RA0NNN	412 A	250 HP / 187 kW	B	Higher-power class

This progression is useful when selecting a drive during a retrofit. The first selection factor should be the motor’s actual armature current and operating requirements rather than selecting a drive based only on horsepower.

25. Five Popular Allen-Bradley Related Models

The following models are popular Allen-Bradley PowerFlex products from related AC-drive families. They are useful for comparison when an application is being evaluated for a new AC motor system.

They should not be treated as direct drop-in replacements for the 20P41AD250RA0NNN. The 20P41AD250RA0NNN is a DC drive, while the models below belong to AC drive families and therefore require a compatible AC motor and a different system architecture.

Model / Catalog Number	Product Family	Voltage Class	Current Class	Approx. Motor Power Class	Motor Type	Dimensions	Weight
25B-D017N114	PowerFlex 525	480 VAC class	17 A	10 HP class	AC Motor	Configuration-dependent	Configuration-dependent
25B-D030N114	PowerFlex 525	480 VAC class	30 A	15 HP class	AC Motor	Configuration-dependent	Configuration-dependent
20G11ND077AA0NNNNN	PowerFlex 755	480 VAC class	77 A	50 HP class	AC Motor	Configuration-dependent	Configuration-dependent
20G11ND156AA0NNNNN	PowerFlex 755	480 VAC class	156 A	100 HP class	AC Motor	Configuration-dependent	Configuration-dependent
22F-D060N103	PowerFlex 4M	480 VAC class	6 A class	3 HP class	AC Motor	Configuration-dependent	Configuration-dependent

These related products are better understood as part of the broader PowerFlex AC-drive portfolio rather than as direct substitutes for a high-power regenerative DC drive.

26. Why the 20P41AD250RA0NNN Is Different From a Typical AC Drive

The fundamental difference is the motor technology.

The 20P41AD250RA0NNN is designed for a DC motor system.

A typical PowerFlex AC drive is designed to control an AC induction motor, permanent-magnet motor, or another compatible AC motor technology.

Consequently, replacing a DC drive with an AC drive is not simply a matter of matching horsepower.

A conversion from DC to AC can require:

• Motor replacement
• Mechanical coupling inspection
• Gearbox evaluation
• Encoder replacement
• Control-system modifications
• Cable modifications
• Braking-system changes
• Cabinet modifications
• Parameter changes
• PLC logic changes
• Production testing

For this reason, retaining an existing DC motor can be attractive when the motor and mechanical equipment remain in good condition.

27. Cabinet Installation Considerations

The 20P41AD250RA0NNN is an IP20, NEMA/UL Type Open product, so cabinet planning is an important part of installation.

The cabinet should provide sufficient room for:

• Drive mounting
• Incoming AC power
• Motor armature wiring
• Field wiring
• Control wiring
• Feedback wiring
• Grounding
• Protection devices
• Disconnect equipment
• Ventilation
• Heat management
• Service access

The approximate drive dimensions of 311 × 388 × 350 mm should therefore not be treated as the complete cabinet footprint.

Additional clearance is normally required around the drive for wiring, airflow, inspection, and maintenance.

28. Cooling and Thermal Management

A 250 A industrial DC drive can produce substantial heat during operation.

Cabinet thermal design should therefore consider:

• Drive losses
• Ambient temperature
• Cabinet size
• Internal airflow
• Fan arrangement
• Heat dissipation
• Nearby heat-producing equipment
• Air filtration
• Cabinet enclosure construction

A drive that is electrically suitable can still experience operating problems if it is installed in a cabinet with insufficient thermal management.

For retrofit projects, it is useful to inspect the original cabinet for accumulated dust, blocked ventilation paths, deteriorated fans, and excessive internal temperature.

29. Feedback Wiring Considerations

Feedback wiring deserves particular attention during a DC drive replacement.

Existing machines may use a tachometer, encoder, resolver-related interface, or another feedback arrangement.

Before replacing the old drive, technicians should record:

• Feedback device type
• Feedback voltage
• Signal type
• Wiring polarity
• Number of conductors
• Cable shielding
• Grounding arrangement
• Connector configuration
• Existing feedback scaling
• Motor maximum speed

Incorrect feedback wiring can lead to unstable speed control or incorrect speed measurement.

30. Maintenance Considerations

Maintenance of the 20P41AD250RA0NNN should be approached as part of the entire drive-and-motor system.

Routine inspection can include:

• Cabinet cleanliness
• Cooling airflow
• Fan condition
• Terminal tightness
• Cable condition
• Grounding
• Feedback wiring
• Motor brushes
• Commutator condition
• Motor bearings
• Field circuit
• Armature circuit
• Control wiring

Because this is a DC motor application, motor maintenance can be just as important as electronic drive maintenance.

Brush wear, commutator condition, bearing condition, and field-circuit performance should be considered during scheduled maintenance.

31. Product Selection Checklist

Before selecting the 20P41AD250RA0NNN for an existing machine, the following information should be collected.

Selection Item	Recommended Check
Drive Model	20P41AD250RA0NNN
Input Voltage	Confirm 460/480 VAC class
Input Phase	Confirm 3-phase supply
Motor Power	Confirm approximately 150 HP / 112 kW
Motor Armature Current	Confirm motor nameplate current
Motor Armature Voltage	Confirm motor nameplate voltage
Field Voltage	Confirm motor field requirements
Field Current	Confirm motor field current
Motor Speed	Confirm base and maximum speed
Feedback	Confirm tachometer or encoder
Regeneration	Confirm four-quadrant operation requirements
Mechanical Load	Check inertia and torque requirements
Acceleration	Check required acceleration time
Deceleration	Check required deceleration time
Cabinet	Confirm space and ventilation
Dimensions	Approx. 311 × 388 × 350 mm
Product Weight	Approx. 29.5 kg
Control System	Check external control architecture
Communication	Check whether external communication hardware is required

This information helps avoid a common retrofit mistake: selecting a drive solely from the motor horsepower.

32. Typical Machine Types

The 20P41AD250RA0NNN can be considered for applications such as:

• Large conveyors
• Rolling equipment
• Metal-processing machinery
• Paper machinery
• Printing machinery
• Winding machines
• Unwinding machines
• Coating lines
• Drawing equipment
• Finishing equipment
• Material-processing machinery
• High-inertia rotating equipment
• Continuous production lines
• DC motor retrofit systems
• Reversing machinery

33. Product Advantages Summary

Advantage	Practical Meaning
250 A Current Capacity	Suitable for high-power DC motor systems
150 HP Rating	Supports large industrial DC motors
Four-Quadrant Operation	Supports motoring and regenerative operation
Regenerative Capability	Useful for frequent deceleration and overhauling loads
Six-Pulse Input	Established industrial input architecture
Regulated Field Supply	Supports controlled DC motor field operation
Frame B	Suitable for high-power industrial drive construction
IP20 Construction	Intended for cabinet-based industrial installation
Conformal Coating	Additional protection for electronic assemblies
DC Motor Retrofit Capability	Allows existing DC machinery to be modernized
Feedback Support	Suitable for applications requiring controlled speed
Industrial Power Range	Appropriate for demanding production machinery

34. Overall Application Value

The 20P41AD250RA0NNN is most relevant when a machine has a large DC motor and the application requires controlled speed, high current, reversing, or regenerative operation.

Its 250 A rating places it in a high-power range within the PowerFlex DC family.

For existing machinery, one of its practical benefits is that the drive can form part of a modernization project without automatically requiring the complete machine to be redesigned.

This can be particularly useful when the existing mechanical system is expensive, difficult to replace, or still provides the required production performance.

35. Product Description for Industrial Equipment Listings

The Allen-Bradley 20P41AD250RA0NNN PowerFlex DC Drive is a high-power regenerative DC motor controller rated for 480 VAC-class three-phase input, 250 A output current, and 150 HP motor applications. The drive features six-pulse input architecture, four-quadrant regenerative operation, a regulated single-phase field supply, Frame B construction, and an IP20 NEMA/UL Type Open enclosure with conformal coating.

With its combination of high current capacity and regenerative DC motor control, the 20P41AD250RA0NNN is suited to demanding industrial machinery such as material-handling systems, winding and unwinding equipment, metal-processing machinery, paper and converting lines, high-inertia equipment, reversing machinery, and DC motor modernization projects.

The approximate physical size is 311 × 388 × 350 mm, with an approximate product weight of 29.5 kg. The unit is designed for cabinet installation and should be integrated with suitable incoming power protection, motor connections, field wiring, feedback equipment, grounding, cooling, and control-system interfaces.

The 20P41AD250RA0NNN is therefore particularly relevant to applications where a high-power DC motor remains an important part of an established industrial machine and where controlled motoring, regenerative braking, speed regulation, and reliable industrial integration are required.

36. Key Specifications at a Glance

Specification	20P41AD250RA0NNN
Brand	Allen-Bradley
Series	PowerFlex DC
Product Type	Regenerative DC Drive
Input	480 VAC class
Input Phase	3 Phase
Input Type	6 Pulse
Output Current	250 A
Motor Rating	150 HP
Motor Rating	Approximately 112 kW
Motor Operation	Four Quadrant / Regenerative
Field Supply	Single Phase Regulated
Frame	B
Enclosure	IP20
Enclosure Type	NEMA/UL Type Open
Coating	Conformal Coating
HIM	Blank Plate / No HIM
Communication Module	None as standard
Dimensions H × W × D	Approx. 311 × 388 × 350 mm
Weight	Approx. 29.5 kg
Main Application	High-power DC motor control
Main Retrofit Use	Existing DC motor modernization

37. Final Technical Summary

The 20P41AD250RA0NNN is a 250 A, 150 HP regenerative DC drive in the Allen-Bradley PowerFlex DC series.

Its core characteristics are the 480 VAC-class three-phase input, six-pulse architecture, 250 A output capacity, 150 HP motor rating, four-quadrant regenerative operation, regulated single-phase field supply, Frame B construction, and IP20 NEMA/UL Type Open enclosure.

The approximate physical dimensions are 311 × 388 × 350 mm, while the approximate product weight is 29.5 kg.

For industrial applications, the most important characteristics are its ability to control a large DC motor, provide controlled motoring and regeneration, support demanding acceleration and deceleration cycles, and serve as part of a DC motor modernization project.

When evaluating this model for a replacement or retrofit, the motor’s actual armature current, armature voltage, field requirements, feedback device, speed range, mechanical inertia, acceleration/deceleration requirements, and cabinet conditions should all be checked before final selection.