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Allen-Bradley MPL-B430H-SJ72AA Low-Inertia Servo Motor

1. Product Overview

The Allen-Bradley MPL-B430H-SJ72AA is a low-inertia brushless AC servo motor designed for industrial motion-control applications where accurate positioning, controlled acceleration, stable torque output, and reliable high-speed operation are required.

This model belongs to the MP-Series MPL low-inertia servo motor family and uses a 400 V-class winding with a 460 V armature rating. It has a 115 mm frame size, a 76.2 mm magnet stack, and a 3500 rpm rated speed. The motor uses a single-turn high-resolution absolute encoder, a keyed shaft extension, and a right-angle SpeedTEC DIN connector. It is supplied in a no-brake configuration.

The MPL-B430H-SJ72AA is particularly suitable for machinery that needs a relatively strong torque output while maintaining a compact servo-motor package.

The “H” speed designation distinguishes this model from the faster 5000 rpm “P” versions in the same general motor family. The 3500 rpm operating class makes the B430H suitable for applications where the machine requires strong torque and controlled motion rather than simply maximizing rotational speed.

Its 115 mm frame and 76.2 mm magnet stack give the motor a solid mechanical platform, while the low-inertia design helps it respond quickly to changes in the commanded motion profile.

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2. Brand Information

Item	Specification
Model	MPL-B430H-SJ72AA
Brand	Allen-Bradley
Product Family	MP-Series MPL
Product Type	Low-Inertia Brushless Servo Motor
Motor Type	AC Rotary Servo Motor
Voltage Class	400 V AC
Armature Voltage	460 V
Rated Speed	3500 rpm
Feedback	Single-Turn High-Resolution Encoder
Shaft	Keyed Shaft Extension
Brake	No Brake
Connector	SpeedTEC DIN, Right Angle
Frame Size	115 mm
Magnet Stack	76.2 mm
Approx. Weight	5.44 kg

The MPL-B430H-SJ72AA is a member of the Allen-Bradley MPL servo motor range and is configured for applications requiring a keyed mechanical shaft, high-resolution single-turn feedback, and a 3500 rpm motor speed class.

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3. Product Series

MP-Series MPL Low-Inertia Servo Motor Series

The MPL-B430H-SJ72AA belongs to the MP-Series MPL low-inertia brushless servo motor series.

The MPL family is designed for machine builders who need more controlled motion than a conventional fixed-speed motor can provide.

A servo motor is part of a closed-loop motion system. The motor works together with a servo drive and feedback device so that the control system can continuously monitor position and speed and make corrections during operation.

The MPL family includes different motor frame sizes, stack lengths, speed classes, feedback configurations, shaft types, connector arrangements, and brake options.

Within this range, the B430H configuration is characterized by a 115 mm frame, 76.2 mm magnet stack, and 3500 rpm speed class.

The B430H is therefore a useful choice when an application needs more torque capability than smaller servo motors but does not require the 5000 rpm operating class of the B430P configuration.

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4. Basic Product Parameters

Parameter	Specification
Model	MPL-B430H-SJ72AA
Brand	Allen-Bradley
Series	MP-Series MPL
Motor Type	Low-Inertia Brushless AC Servo Motor
Voltage Class	400 V AC
Armature Voltage	460 V
Rated Speed	3500 rpm
Speed Class	3500 rpm
Continuous Torque	Approx. 6.21 N·m
Rated Output	Approx. 2.0 kW
Feedback	Absolute Single-Turn High-Resolution Encoder
Feedback Resolution	1024 Sin/Cos
Feedback Protocol	Hiperface
Shaft Type	Keyed Shaft Extension
Shaft Seal	No Shaft Seal
Brake	No Brake
Connector	SpeedTEC DIN Connector
Connector Position	Right Angle
Connector Rotation	180° Rotatable
Frame Size	115 mm
Magnet Stack Length	76.2 mm
Mounting	IEC Metric
Mounting Style	Free Mounting Holes, Type FF
Protection	Standard no-seal configuration
Approx. Weight	5.44 kg
Overall Dimensions	115 mm frame / 76.2 mm stack; complete envelope depends on mechanical configuration

The model identification and primary configuration are consistent across the available product descriptions: 115 mm frame, 76.2 mm stack, 3500 rpm, single-turn high-resolution feedback, keyed shaft, SpeedTEC DIN right-angle connector, and no brake.

The motor is commonly listed with approximately 6.21 N·m continuous torque, placing it above the B420H/B420-class level in applications where additional continuous torque is needed. The corresponding power level is approximately 2.0 kW at the 3500 rpm operating class.

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5. Detailed Electrical Parameters

Electrical Parameter	Value
Model	MPL-B430H-SJ72AA
Voltage Class	400 V AC
Armature Voltage	460 V
Rated Speed	3500 rpm
Continuous Torque	Approx. 6.21 N·m
Rated Power	Approx. 2.0 kW
Phase	Three-phase AC
Motor Type	Brushless Servo Motor
Duty	Continuous industrial servo duty
Feedback	Single-turn high-resolution
Encoder	1024 Sin/Cos
Protocol	Hiperface
Brake	No brake

The 460 V armature rating is one of the defining electrical characteristics of the B430H-SJ72AA. The model is part of the 400 V-class MPL motor group.

The 3500 rpm speed rating is also significant.

This motor is not intended to compete directly with every 5000 rpm servo configuration. Instead, it provides a different balance between speed and torque, making it attractive when the machine’s motion profile places more emphasis on torque output and controlled acceleration than on maximum shaft speed.

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6. Mechanical Parameters

Mechanical Parameter	Specification
Model	MPL-B430H-SJ72AA
Frame Size	115 mm
Magnet Stack Length	76.2 mm
Frame Designation	Frame 4
Stack Designation	30
Shaft Type	Keyed
Shaft Seal	None
Brake	None
Mounting Standard	IEC Metric
Mounting Type	Free Mounting Holes / Type FF
Connector	SpeedTEC DIN
Connector Direction	Right Angle
Connector Rotation	180°
Approx. Weight	5.44 kg
Overall Envelope	Configuration-dependent
Basic Frame Dimension	115 mm
Basic Stack Dimension	76.2 mm

The 115 mm frame and 76.2 mm magnet stack are the key mechanical dimensions used when selecting this motor.

For actual machine construction, the complete mechanical drawing should be used for shaft diameter, shaft extension, flange dimensions, mounting-hole locations, connector clearance, and total motor length.

The frame size and magnet stack are useful for initial motor selection, but they should not be treated as a substitute for the complete dimensional drawing.

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7. Dimensions and Weight

The MPL-B430H-SJ72AA is based on a 115 mm frame with a 76.2 mm magnet stack.

The approximate motor weight is 5.44 kg.

Dimension / Weight Item	Value
Model	MPL-B430H-SJ72AA
Frame Size	115 mm
Magnet Stack Length	76.2 mm
Stack Length in Inches	3.0 in
Approx. Weight	5.44 kg
Shaft Configuration	Keyed
Shaft Seal	None
Brake	No Brake
Connector	Right-Angle SpeedTEC DIN
Connector Rotation	180°
Mounting	IEC Metric

The 76.2 mm stack is longer than the 50.8 mm stack used by many B420P configurations.

That additional magnetic stack length is one reason the B430H provides a higher torque capability while remaining within the same general 115 mm frame class.

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8. Model Number Interpretation

The model number MPL-B430H-SJ72AA contains useful information about the motor configuration.

Model Code	Meaning
MPL	MP-Series MPL low-inertia servo motor
B	400 V-class motor configuration
4	Frame 4, approximately 115 mm
30	76.2 mm magnet stack
H	3500 rpm speed class
S	Single-turn high-resolution encoder
J	Keyed shaft extension
7	SpeedTEC DIN right-angle connector
2	No brake
AA	Standard configuration designation

This coding structure is especially useful when comparing related MPL motors.

For example, the SJ72AA suffix indicates a single-turn encoder, keyed shaft, SpeedTEC DIN right-angle connector, and no brake.

A related SJ74AA version keeps the general shaft and feedback configuration but adds a brake.

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9. Product Introduction

The MPL-B430H-SJ72AA is a servo motor intended for industrial equipment where accurate rotary motion is required.

Unlike a simple induction motor that is normally selected around voltage, frequency, and basic power requirements, a servo motor is selected according to a complete motion profile.

That motion profile may include acceleration, constant-speed movement, deceleration, stopping, reversing, indexing, synchronization, and repeated positioning.

The B430H-SJ72AA is particularly suitable for machines that require substantial torque while operating at a controlled 3500 rpm speed.

The motor’s low-inertia construction allows the rotor to respond quickly to commands from the servo drive.

This can be especially valuable in equipment where the motor does not simply rotate continuously, but instead changes speed many times during each production cycle.

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10. Low-Inertia Motor Design

Low inertia is one of the central characteristics of the MPL motor family.

A low-inertia rotor can accelerate and decelerate more quickly than a higher-inertia motor under comparable conditions.

This is useful in applications such as:

• Indexing
• Pick-and-place
• Automated assembly
• Packaging
• Material positioning
• Rotary transfer
• Machine automation
• Repeated start-stop motion

The practical advantage is most noticeable when the machine has a dynamic motion profile.

For a machine that operates continuously at one fixed speed, the benefits of low inertia may be less important.

For a machine that repeatedly accelerates, stops, reverses, and repositions, low inertia can have a much greater impact on machine response.

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11. 3500 RPM Speed Class

The MPL-B430H-SJ72AA is rated for 3500 rpm.

This places it in a different performance class from the 5000 rpm B430P models.

A 3500 rpm motor can be an excellent choice when the application requires stronger torque at a moderate-high speed rather than the highest possible motor speed.

This can simplify mechanical transmission design in applications where the motor is directly coupled or where only moderate gearing is required.

The 3500 rpm rating can also be useful when machine designers want a balance between speed, torque, thermal performance, and mechanical operating life.

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12. Continuous Torque Capability

The B430H-SJ72AA is commonly specified at approximately 6.21 N·m continuous torque.

This is one of the most important selection parameters for the motor.

Continuous torque represents the torque that the motor can provide during sustained operation under the specified operating conditions.

For machine builders, continuous torque should be compared with the actual RMS torque requirement of the application.

The motor should not be selected solely according to the highest instantaneous torque demand.

A machine with high acceleration requirements may need significant peak torque, while a machine with a continuously loaded axis may be limited more by continuous torque and thermal conditions.

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13. High-Resolution Single-Turn Feedback

The MPL-B430H-SJ72AA uses a single-turn high-resolution absolute encoder.

The encoder is specified as 1024 Sin/Cos and uses the Hiperface protocol.

The feedback system provides the servo drive with detailed information about motor position and movement.

This feedback is essential for closed-loop control.

The drive can compare commanded motion with actual motor movement and continuously adjust the motor’s operation.

High-resolution feedback is particularly useful when the machine requires:

• Accurate positioning
• Repeatable indexing
• Controlled acceleration
• Controlled deceleration
• Speed synchronization
• Precise rotary movement

The single-turn arrangement is appropriate for applications where absolute position within one revolution is sufficient and multi-turn absolute position tracking is not required.

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14. Keyed Shaft Extension

The MPL-B430H-SJ72AA uses a keyed shaft extension.

This is an important mechanical difference when compared with keyless MPL configurations.

A keyed shaft is useful when the machine’s coupling, pulley, gearbox, or transmission component is designed around a traditional shaft-key connection.

When replacing an existing motor, the shaft type should always be checked before ordering.

A motor with identical electrical specifications may still be mechanically unsuitable if the existing machine requires a keyed shaft and the replacement uses a keyless shaft, or vice versa.

The coupling should also be selected according to motor torque, peak loading, speed, radial loading, axial loading, and required positioning accuracy.

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15. No-Brake Configuration

The MPL-B430H-SJ72AA is a no-brake motor configuration.

This makes it particularly suitable for horizontal rotary axes and other applications where the motor does not need to mechanically hold the load after servo power is removed.

A brake is not required for every servo application.

In many horizontal axes, the mechanical system remains stable without motor braking.

The no-brake configuration can therefore be a practical and straightforward choice for:

• Horizontal indexing
• Rotary tables
• Conveyors
• Feed mechanisms
• Horizontal positioning axes
• General automated machinery

However, vertical axes require additional consideration.

If the load can fall or move when motor torque is removed, a brake-equipped motor or separate mechanical holding mechanism may be necessary.

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16. SpeedTEC DIN Connector

The motor uses a SpeedTEC DIN connector in a right-angle configuration.

The connector can be rotated through 180 degrees, providing additional flexibility when installing the motor in compact equipment.

This can make cable routing easier.

In automated machinery, motor and feedback cables often have to pass through restricted machine spaces.

A rotatable connector allows the cable direction to be adjusted to suit the machine structure.

This can help prevent unnecessary cable bending and interference with moving parts.

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17. Shaft Seal and Environmental Considerations

The standard MPL-B430H-SJ72AA configuration is listed with no shaft seal.

This is an important consideration when selecting the motor for a harsh environment.

The no-seal configuration is suitable for many standard industrial machine environments where the motor shaft is not exposed to significant liquid contamination.

For applications requiring greater environmental protection around the shaft, an appropriate shaft-seal configuration should be evaluated.

The environmental rating of a servo motor should always be considered together with:

• Shaft sealing
• Connector condition
• Cable installation
• Mounting orientation
• Ambient temperature
• Dust
• Water exposure
• Chemical exposure

The motor should be selected according to the complete machine environment rather than relying on one enclosure specification alone.

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18. Main Product Advantages

18.1 Strong Torque in a Compact Frame

The B430H configuration provides approximately 6.21 N·m continuous torque within a 115 mm frame.

This gives the motor a useful torque-to-size balance.

It is suitable for machine axes where smaller motors may not provide enough continuous torque but where a much larger motor would create unnecessary mechanical bulk.

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18.2 Low-Inertia Dynamic Response

The low-inertia rotor allows the motor to respond quickly to changes in commanded speed.

This is particularly valuable for cyclic automation equipment.

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18.3 3500 RPM High-Speed Capability

The 3500 rpm rating is high enough for many industrial motion applications while maintaining a torque-oriented motor configuration.

It is a good compromise for applications that need speed but do not require 5000 rpm.

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18.4 High-Resolution Feedback

The single-turn high-resolution encoder provides detailed position feedback.

This supports accurate closed-loop motion and repeatable positioning.

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18.5 Keyed Shaft

The keyed shaft makes the motor convenient for traditional mechanical transmission arrangements.

It can be directly compared with keyless versions when selecting a replacement or new machine motor.

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18.6 Simple No-Brake Configuration

The no-brake configuration is useful when the machine does not require mechanical holding at the motor shaft.

This can be particularly appropriate for horizontal axes.

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18.7 Flexible Connector Arrangement

The right-angle connector with 180-degree rotation helps simplify installation in restricted machine spaces.

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18.8 115 mm Frame

The 115 mm frame offers a good balance between physical size and output capability.

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18.9 76.2 mm Magnet Stack

The 76.2 mm stack gives this model a longer active magnetic length than shorter B430 configurations.

This contributes to its higher torque capability.

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19. Typical Applications

Packaging Machinery

The MPL-B430H-SJ72AA can be used in packaging machinery requiring controlled rotary movement.

Potential applications include:

• Product feeding
• Rotary indexing
• Cutting
• Sealing
• Positioning
• Packaging transfer
• Film-handling mechanisms

The low-inertia design is useful when the machine repeatedly changes speed during each cycle.

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20. Automated Assembly Equipment

Automated assembly machines often require multiple servo axes.

One axis may control a rotary table while another controls a feeder or positioning mechanism.

The B430H-SJ72AA can be considered for axes that require higher torque than smaller MPL motors while remaining within a relatively compact frame.

Its high-resolution feedback is suitable for repeated positioning operations.

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21. Material Handling Systems

Material-handling equipment often requires controlled acceleration and deceleration.

Typical applications include:

• Product transfer
• Conveyor indexing
• Rotary transfer
• Feeding mechanisms
• Automated alignment
• Material positioning

The motor’s torque capability makes it suitable for applications involving moderate mechanical loads.

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22. Rotary Indexing Tables

Rotary indexing systems are a natural application for servo motors.

The motor can accelerate the table, reach the commanded position, decelerate, and hold the required position under servo control.

The 3500 rpm speed class provides sufficient motor speed for many indexing mechanisms while retaining a strong torque-oriented configuration.

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23. Pick-and-Place Equipment

Pick-and-place machinery requires both speed and positioning accuracy.

The motor can be used on rotary axes that repeatedly move between predefined positions.

The low-inertia rotor helps reduce the time required for acceleration and deceleration.

The single-turn high-resolution encoder supports repeatable positioning.

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24. Machine Automation

The motor can also be considered for general machine automation applications such as:

• Automated feeders
• Rotary positioning units
• Assembly machinery
• Inspection machinery
• Production-line equipment
• Transfer mechanisms
• Automated fixtures
• General servo-controlled machinery

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25. Five Closely Related Models

The following five models are closely related to the MPL-B430H-SJ72AA and are useful for comparing speed, shaft, brake, and feedback configurations.

Model	Speed	Feedback	Shaft	Brake	Continuous Torque	Frame	Stack	Approx. Weight
MPL-B430H-SJ72AA	3500 rpm	Single-turn high-resolution	Keyed	No brake	Approx. 6.21 N·m	115 mm	76.2 mm	5.44 kg
MPL-B430H-SJ74AA	3500 rpm	Single-turn high-resolution	Keyed	24 V DC	Approx. 6.21 N·m	115 mm	76.2 mm	Approx. 6.4 kg
MPL-B430H-SJ22AA	3100 rpm	Single-turn high-resolution	Keyed	No brake	Approx. 6.21 N·m	115 mm	76.2 mm	Approx. 6.4 kg
MPL-B430H-SJ24AA	3100 rpm	Single-turn high-resolution	Keyed	24 V DC	Approx. 6.21 N·m	115 mm	76.2 mm	Approx. 6.4 kg
MPL-B430P-SJ72AA	5000 rpm	Single-turn high-resolution	Keyed	No brake	Approx. 6.55 N·m	115 mm	76.2 mm	Approx. 6.4 kg

The B430H family provides several configurations that are mechanically close to the target model.

The most important differences are speed class and brake configuration.

The B430P version is particularly useful when the application requires a higher 5000 rpm operating speed.

The B430H versions are more suitable when the machine’s speed requirement is closer to 3500 rpm.

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26. Five Popular Same-Brand Models for Comparison

The following models provide useful comparison points when selecting a servo motor from the same brand.

Model	Series	Rated Speed	Continuous Torque	Rated Power	Feedback	Shaft	Brake	Frame / Stack	Approx. Weight
MPL-B420P-SK74AA	MP-Series MPL	5000 rpm	4.74 N·m	1.9 kW	Single-turn high-resolution	Keyless	24 V DC	115 / 50.8 mm	Approx. 5.44 kg
MPL-B430P-SJ72AA	MP-Series MPL	5000 rpm	6.55 N·m	Approx. 2.2 kW	Single-turn high-resolution	Keyed	No brake	115 / 76.2 mm	Approx. 6.4 kg
MPL-B430P-SJ74AA	MP-Series MPL	5000 rpm	6.55 N·m	Approx. 2.2 kW	Single-turn high-resolution	Keyed	24 V DC	115 / 76.2 mm	Approx. 8.2 kg
MPL-B430P-MJ74AA	MP-Series MPL	5000 rpm	6.55 N·m	Approx. 2.2 kW	Absolute multi-turn	Keyed	24 V DC	115 / 76.2 mm	Approx. 8.2 kg
MPL-B430P-RJ74AA	MP-Series MPL	5000 rpm	6.55 N·m	Approx. 2.2 kW	Resolver	Keyed	24 V DC	115 / 76.2 mm	Approx. 8.2 kg

The B430P family is a natural comparison group for the B430H-SJ72AA because it uses the same general 115 mm / 76.2 mm mechanical class but provides a 5000 rpm speed rating.

The B430P family also offers several feedback configurations, including single-turn, multi-turn, and resolver-based versions.

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27. B430H-SJ72AA vs B430H-SJ74AA

Parameter	MPL-B430H-SJ72AA	MPL-B430H-SJ74AA
Voltage Class	400 V	400 V
Armature Voltage	460 V	460 V
Speed	3500 rpm	3500 rpm
Continuous Torque	Approx. 6.21 N·m	Approx. 6.21 N·m
Frame	115 mm	115 mm
Magnet Stack	76.2 mm	76.2 mm
Feedback	Single-turn high-resolution	Single-turn high-resolution
Shaft	Keyed	Keyed
Brake	No brake	24 V DC
Connector	SpeedTEC DIN	SpeedTEC DIN
Approx. Weight	5.44 kg	Approx. 6.4 kg

The main difference is the brake.

The SJ72AA is the simpler no-brake version.

The SJ74AA is the brake-equipped version and is more suitable for applications where the axis needs a mechanical holding function.

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28. B430H-SJ72AA vs B430P-SJ72AA

Parameter	MPL-B430H-SJ72AA	MPL-B430P-SJ72AA
Voltage	460 V	460 V
Speed	3500 rpm	5000 rpm
Continuous Torque	Approx. 6.21 N·m	Approx. 6.55 N·m
Rated Power	Approx. 2.0 kW	Approx. 2.2 kW
Feedback	Single-turn high-resolution	Single-turn high-resolution
Shaft	Keyed	Keyed
Brake	No brake	No brake
Frame	115 mm	115 mm
Magnet Stack	76.2 mm	76.2 mm
Approx. Weight	5.44 kg	Approx. 6.4 kg

This is one of the most useful comparisons.

The B430H is the 3500 rpm version.

The B430P is the 5000 rpm version.

If the application does not need 5000 rpm, the B430H can provide a more torque-oriented speed configuration.

If the machine requires a higher motor speed and shorter cycle times, the B430P may be the better choice.

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29. B430H-SJ72AA vs B420P-SK74AA

Parameter	MPL-B430H-SJ72AA	MPL-B420P-SK74AA
Speed	3500 rpm	5000 rpm
Continuous Torque	Approx. 6.21 N·m	4.74 N·m
Rated Power	Approx. 2.0 kW	1.9 kW
Frame	115 mm	115 mm
Magnet Stack	76.2 mm	50.8 mm
Feedback	Single-turn high-resolution	Single-turn high-resolution
Shaft	Keyed	Keyless
Brake	No brake	24 V DC
Approx. Weight	5.44 kg	Approx. 5.44 kg

These two motors are useful examples of how model selection changes according to the application.

The B430H provides more continuous torque and a longer magnet stack.

The B420P provides a higher 5000 rpm speed rating and uses a keyless shaft with an integrated holding brake.

Therefore, neither model is universally “better.” The appropriate choice depends on the machine’s speed, torque, shaft, and brake requirements.

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30. Application Selection Guide

Application Requirement	Recommended Model Type
3500 rpm, keyed shaft, no brake	MPL-B430H-SJ72AA
3500 rpm, keyed shaft, holding brake	MPL-B430H-SJ74AA
3100 rpm, keyed shaft, no brake	MPL-B430H-SJ22AA
3100 rpm, keyed shaft, brake	MPL-B430H-SJ24AA
5000 rpm, keyed shaft, no brake	MPL-B430P-SJ72AA
5000 rpm, keyed shaft, brake	MPL-B430P-SJ74AA
5000 rpm, multi-turn feedback	MPL-B430P-MJ72AA / MJ74AA
Resolver feedback	MPL-B430P-RJ72AA / RJ74AA
Keyless shaft required	Select corresponding SK configuration

The first step in servo motor selection should always be determining the actual machine motion profile.

The designer should calculate the required continuous torque, peak torque, acceleration, deceleration, maximum speed, and load inertia.

After that, shaft type, brake requirements, feedback type, dimensions, and environmental conditions should be evaluated.

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31. Installation Considerations

The MPL-B430H-SJ72AA should be mounted on a rigid machine structure.

The motor shaft should be properly aligned with the driven component.

Incorrect alignment can increase mechanical stress on the motor bearings and coupling.

Because the motor is capable of 3500 rpm operation, mechanical balance and alignment become increasingly important as speed increases.

The keyed shaft should be matched with an appropriate coupling, pulley, gearbox, or transmission component.

The coupling should be rated for the motor’s continuous torque and peak torque and should be capable of operating at the required speed.

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32. Cable and Connector Considerations

The right-angle SpeedTEC DIN connector provides flexibility when routing cables.

The connector can be rotated through 180 degrees, allowing the cable path to be adjusted to the machine layout.

When installing the motor, adequate clearance should be maintained around the connector.

The cable should not be forced into a sharp bend immediately at the connector.

A clean cable path helps reduce mechanical stress and makes future maintenance easier.

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33. Brake Selection Considerations

The standard MPL-B430H-SJ72AA does not have an integrated brake.

This is appropriate for many horizontal axes.

However, a vertical axis may require a holding mechanism because gravity can cause the load to move when motor torque is removed.

If the machine requires motor-mounted holding capability, the SJ74AA brake-equipped version is a more appropriate configuration to evaluate.

The brake should be treated as a holding device rather than a substitute for complete machine safety engineering.

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34. Maintenance Considerations

Regular maintenance should include inspection of the motor mounting, shaft coupling, cables, connectors, and surrounding mechanical components.

Particular attention should be paid to:

• Excessive vibration
• Unusual bearing noise
• Abnormal motor temperature
• Coupling misalignment
• Loose mounting hardware
• Damaged cables
• Feedback connection problems
• Connector damage

Servo motors depend on accurate feedback, so electrical connection problems can sometimes appear as positioning faults rather than obvious motor faults.

Keeping the motor and its surrounding mechanical system clean and properly aligned can help maintain consistent performance.

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35. Replacement Selection Checklist

When using the MPL-B430H-SJ72AA as a replacement motor, the following specifications should be checked carefully.

Selection Item	MPL-B430H-SJ72AA
Model	MPL-B430H-SJ72AA
Brand	Allen-Bradley
Series	MP-Series MPL
Voltage Class	400 V AC
Armature Voltage	460 V
Speed	3500 rpm
Continuous Torque	Approx. 6.21 N·m
Rated Power	Approx. 2.0 kW
Feedback	Single-turn high-resolution
Encoder	1024 Sin/Cos
Protocol	Hiperface
Shaft	Keyed
Shaft Seal	None
Brake	No brake
Connector	SpeedTEC DIN
Connector Type	Right angle
Connector Rotation	180°
Frame Size	115 mm
Magnet Stack	76.2 mm
Mounting	IEC Metric
Approx. Weight	5.44 kg

A replacement should not be selected solely because the frame size looks similar.

The voltage class, speed, torque, feedback, shaft type, brake arrangement, connector configuration, mounting dimensions, and machine duty cycle should all match the requirements of the application.

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36. Main Advantages at a Glance

Advantage	Description
115 mm Frame	Compact industrial servo-motor frame
76.2 mm Stack	Longer active magnetic stack for stronger torque capability
3500 rpm Speed	High-speed operation for many industrial applications
Approx. 6.21 N·m Continuous Torque	Suitable for moderate-to-high continuous mechanical loads
Approx. 2.0 kW Output	Useful power level for industrial motion axes
Low-Inertia Design	Fast response during acceleration and deceleration
High-Resolution Feedback	Accurate closed-loop position control
Keyed Shaft	Convenient for conventional mechanical couplings
No Brake	Simple configuration for applications without holding requirements
SpeedTEC DIN Connector	Practical industrial cable connection
180° Connector Rotation	Flexible installation and cable routing
5.44 kg Approx. Weight	Reasonable mass for a 115 mm-frame motor
IEC Metric Mounting	Suitable for standard machine mounting arrangements

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37. Why Choose the B430H-SJ72AA?

The B430H-SJ72AA is a good choice when the machine requires a combination of:

• Approximately 6.21 N·m continuous torque
• Approximately 2.0 kW output
• 3500 rpm operating speed
• Low-inertia dynamic response
• Single-turn high-resolution feedback
• Keyed shaft connection
• No integrated brake
• 115 mm frame size
• 76.2 mm magnet stack

The motor is especially attractive when a 5000 rpm motor would provide more speed than the machine actually needs.

Instead, the B430H configuration offers a more moderate speed class while maintaining a strong torque capability.

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38. When a Different Model May Be Better

The MPL-B430H-SJ72AA is not the best choice for every application.

A different model should be considered if the machine requires a specific feature that this model does not provide.

For example, if the machine needs a holding brake, the brake-equipped MPL-B430H-SJ74AA should be considered.

If the machine needs 5000 rpm operation, a B430P configuration may be more suitable.

If the machine needs multi-turn absolute feedback, a corresponding multi-turn MPL configuration should be selected.

If the machine requires a keyless shaft, a corresponding K configuration should be evaluated.

This is why the complete model number is important when selecting an MPL motor.

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39. Product Selection by Machine Type

Machine Type	Suitability	Reason
Packaging Machinery	Excellent	Fast and repeatable rotary movement
Assembly Machinery	Excellent	High-resolution positioning
Rotary Indexing	Excellent	Good torque and controlled speed
Material Handling	Excellent	Strong continuous torque
Horizontal Positioning	Excellent	No brake required in many configurations
Pick-and-Place	Very Good	Low-inertia response
Automated Feeders	Very Good	Controlled speed and positioning
Vertical Axis	Conditional	External holding or brake may be required
High-Speed 5000 rpm Axis	Limited	B430P configuration may be more appropriate
Multi-Turn Positioning	Limited	Multi-turn feedback model may be preferable

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40. Overall Product Evaluation

The Allen-Bradley MPL-B430H-SJ72AA is a well-balanced industrial servo motor for applications that require strong torque, controlled speed, accurate feedback, and fast dynamic response.

Its 115 mm frame and 76.2 mm magnet stack provide a substantial motor platform while maintaining a manageable physical size.

The 3500 rpm rating makes it suitable for machines that require high-speed movement but do not necessarily need a 5000 rpm motor.

The approximately 6.21 N·m continuous torque gives it a strong position within the MPL motor range.

The low-inertia design is particularly useful for machines with frequent acceleration and deceleration.

The single-turn high-resolution encoder provides the feedback required for precise closed-loop motion.

The keyed shaft makes the motor convenient for conventional mechanical transmission systems.

The no-brake configuration keeps the motor relatively straightforward for applications where mechanical holding is not required.

Overall, this is a practical servo motor for automated machinery that needs a combination of torque, speed, accuracy, and compact mechanical construction.

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41. Final Product Summary

The Allen-Bradley MPL-B430H-SJ72AA is a MP-Series MPL low-inertia brushless AC servo motor designed for industrial motion-control systems.

Its main configuration is based on a 400 V-class motor winding, 460 V armature voltage, 3500 rpm speed rating, 115 mm frame, and 76.2 mm magnet stack. It uses a single-turn high-resolution absolute encoder, keyed shaft extension, SpeedTEC DIN right-angle connector, and no integrated brake.

The motor is approximately 5.44 kg, making its weight manageable for many machine-mounted applications while still providing the mechanical strength expected from a 115 mm-frame servo motor.

Its approximate 6.21 N·m continuous torque and approximately 2.0 kW output class make it a useful choice for medium-to-high torque servo applications.

The 3500 rpm speed class provides a good balance between rotational speed and torque.

The single-turn high-resolution encoder provides detailed feedback for closed-loop motion control, while the keyed shaft allows compatibility with conventional coupling and transmission arrangements.

The main advantages of the MPL-B430H-SJ72AA can be summarized as follows:

• 3500 rpm high-speed operation
• Approximately 6.21 N·m continuous torque
• Approximately 2.0 kW output class
• 115 mm frame size
• 76.2 mm magnet stack
• Low-inertia rotor design
• Single-turn high-resolution feedback
• 1024 Sin/Cos encoder
• Hiperface feedback protocol
• Keyed shaft extension
• No integrated brake
• Right-angle SpeedTEC DIN connector
• 180-degree connector rotation
• Approximately 5.44 kg weight

The model is particularly suitable for packaging machinery, automated assembly equipment, rotary indexing systems, material-handling equipment, pick-and-place systems, automated feeders, horizontal positioning axes, and general industrial automation machinery.

For applications requiring an integrated holding brake, the corresponding brake-equipped configuration should be considered.

For applications requiring 5000 rpm, the B430P family provides a more appropriate speed class.

For applications requiring multi-turn absolute feedback or a keyless shaft, the corresponding MPL configuration should be selected instead.

The most important selection characteristics of the MPL-B430H-SJ72AA are therefore its 3500 rpm speed class, approximately 6.21 N·m continuous torque, 115 mm frame, 76.2 mm magnet stack, single-turn high-resolution feedback, keyed shaft, and no-brake configuration.

Taken as a complete package, the motor is best suited to machines that need dependable servo positioning and dynamic response without requiring the maximum 5000 rpm speed offered by some other MPL configurations.