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Allen-Bradley 20BH875N0NNNNNC0 — Detailed Product Introduction, Specifications, Applications, Advantages and Related Model Recommendations

Note: You asked not to show sources, links, or company names other than the requested brand. I have therefore kept the presentation clean and source-free in the text. The model itself is a DC-input PowerFlex 700, 20B-series drive, rather than the similar-looking AC-input 20BD875 model.

1. Product Overview

The Allen-Bradley 20BH875N0NNNNNC0 is a high-power industrial AC drive from the PowerFlex 700, 20B series. It is designed for large industrial motors and demanding variable-speed applications where high current capacity, vector control, controlled acceleration and deceleration, and reliable motor operation are required.

The most important characteristic of this particular model is that it is a DC-input drive. The catalog number 20BH identifies the 540 VDC input class, while the 875 designation indicates an 875 A output-current rating.

This is a very large industrial drive. It is intended for applications in which motor power requirements are substantially higher than those normally handled by compact or general-purpose variable-frequency drives.

The model is rated at approximately 500 HP Normal Duty and 400 HP Heavy Duty. Its continuous output current is 875 A, with higher short-duration current capability available for acceleration and transient load conditions.

The drive uses vector control with 24 V I/O, but this particular configuration has no encoder feedback and no internal communication module. It is also supplied without a HIM keypad, without an internal brake IGBT, and without a drive-mounted braking resistor.

For existing installations, the complete catalog number is important. A similar-looking 20BH875 model can have different control, feedback, communication, braking, or enclosure configurations, so the entire catalog number should be matched when selecting a replacement.

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2. Brand and Product Series

The 20BH875N0NNNNNC0 therefore sits at the very high-power end of the PowerFlex 700 range.

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3. Main Technical Specifications

The 875 A rating is one of the key reasons this drive is considerably larger than conventional PowerFlex units used for small and medium motors.

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4. Model Number Explanation

The catalog number 20BH875N0NNNNNC0 contains several pieces of useful information.

The exact interpretation of individual option characters should always be considered together with the complete catalog number, because the configuration is cumulative rather than determined by a single character.

The particularly important point is the H in the catalog number.

A 20BH875 drive should not be confused with a 20BD875 drive. Both are 875 A PowerFlex 700 products, but the input architecture is different.

The 20BH875 is associated with the 540 VDC input class, while the 20BD875 is an AC-input model in the 480 VAC class.

This distinction is extremely important when selecting a replacement.

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5. Product Introduction

The 20BH875N0NNNNNC0 is essentially a high-power motor-control platform intended to control very large AC motors from a DC power source.

In a conventional AC-input variable frequency drive, incoming three-phase AC power is first rectified into a DC bus and then converted into a controlled AC output.

A DC-input version such as the 20BH875 receives its operating power directly from a DC bus. This makes it particularly suitable for systems where the DC supply already exists or where the overall power architecture has been designed around a common DC bus.

The drive then produces a controlled three-phase output for the connected AC motor.

The output frequency and voltage can be controlled according to the motor-control strategy, allowing the motor to operate at variable speed rather than simply running at the fixed speed determined by the incoming electrical supply.

At 875 A, the drive is intended for a very substantial motor load.

It is therefore better understood as a component of a large industrial power system rather than as a simple standalone motor inverter.

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6. Electrical Performance

The 20BH875N0NNNNNC0 has a continuous output rating of approximately 875 A.

This is a substantial current rating and places the drive in the large industrial-drive category.

Its short-term current capability is higher than the continuous rating. The approximate values are:

The higher short-duration current capability is useful during acceleration and other temporary high-load conditions.

For example, a large conveyor may require significantly more torque during startup than during steady-state operation.

Similarly, a large fan, pump, compressor, mill, or other high-inertia machine may require increased current for a short period during acceleration.

The drive’s overload capability provides additional flexibility for these operating conditions, although the actual application must still be evaluated against the motor’s nameplate current, overload characteristics, acceleration time, ambient temperature, and duty cycle.

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7. Normal Duty and Heavy Duty Ratings

The drive has two important power ratings.

Normal Duty and Heavy Duty should not be treated simply as two different motor horsepower labels.

The distinction relates to the expected load profile and overload requirements.

A motor operating with relatively stable loading may be suitable for the Normal Duty rating.

An application with frequent acceleration, high starting torque, rapid load changes, or substantial overload requirements may need to be evaluated using the Heavy Duty rating.

Therefore, a 500 HP motor is not automatically suitable simply because the catalog lists 500 HP Normal Duty.

The actual motor full-load current and application duty should always be checked.

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8. Dimensions and Weight

Because this is a Frame 10 high-power drive, its physical dimensions are substantial.

For the IP00 / NEMA/UL Type Open DC-input Frame 10 configuration, the approximate dimensions are:

The dimensions should be regarded as approximate mechanical envelope dimensions rather than a substitute for the actual mechanical drawing.

The approximately 305 kg drive weight is also significant.

A suitable lifting arrangement is required for installation and removal. The cabinet, mounting frame, lifting equipment, and service area should all be designed for the actual installed configuration.

The IP00/open construction also means that this is not a drive intended to be exposed directly to an industrial environment without appropriate enclosure protection.

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9. Product Applications

9.1 Large Conveyor Systems

Large conveyors are one of the most important applications for drives in this power class.

Mining conveyors, bulk-material conveyors, aggregate handling equipment, port machinery, steel-production conveyors, and other heavy material-handling systems can use very large motors.

The 20BH875N0NNNNNC0 can provide controlled acceleration and speed regulation for these large motors.

Controlled acceleration is particularly important on long conveyor belts because sudden application of motor torque can produce substantial mechanical stress.

The drive can help provide a smoother transition from stopped operation to running speed.

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9.2 Mining Equipment

Heavy mining equipment frequently requires large motors and high torque.

Applications may include crushers, conveyors, mills, pumps, fans, material-handling equipment, and other large process machines.

The high current capability of the 20BH875 makes it suitable for this general class of application when the motor and system requirements fall within its rating.

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9.3 Large Pumps

Large industrial pumps can require hundreds of horsepower.

Variable-speed control allows the pump motor to operate at different speeds according to process demand.

This can provide better control than simply running the motor at full speed continuously.

Potential applications include industrial water circulation, cooling-water systems, process-fluid pumping, wastewater systems, and large-scale pumping installations.

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9.4 Large Fans and Blowers

Industrial fans and blowers can require very large motors, particularly in mining, steel, cement, chemical processing, power generation, and large ventilation systems.

The drive can regulate motor speed according to airflow requirements.

This allows the system to operate at lower speed when maximum airflow is not necessary.

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9.5 Compressors

Large compressors may have high starting torque and significant mechanical inertia.

A variable-speed drive can provide controlled acceleration and stable operating speed.

The 20BH875 can be considered for large compressor systems where the motor current, torque requirements, speed range, and compressor characteristics are compatible with the drive.

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9.6 Mills and Grinding Equipment

Large mills and grinding machines can require substantial motor torque.

These applications can also experience significant changes in load.

Vector control can be beneficial in applications where the motor must maintain controlled torque while the mechanical load changes.

This makes the PowerFlex 700 high-power architecture suitable for consideration in large process machinery.

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9.7 Large Process Machinery

Other possible applications include:

• Large mixers
• Crushers
• Rollers
• Extruders
• Material-processing equipment
• Heavy-duty machine drives
• Large ventilation systems
• Bulk-material handling systems
• Industrial production machinery
• High-inertia rotating equipment

The suitability of the drive depends on the actual motor current, load characteristics, speed range, required overload capability, braking requirements, and control system.

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10. Product Advantages

10.1 Extremely High Current Capability

The most obvious advantage of the 20BH875N0NNNNNC0 is its 875 A continuous output rating.

This allows the drive to control motors that are far beyond the capacity of small and medium industrial inverters.

It is intended for large machinery where hundreds of amps of motor current may be required.

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10.2 High Motor Power Capability

The 500 HP Normal Duty rating places the drive firmly in the high-power industrial category.

This makes it appropriate for large machines that require substantial mechanical power.

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10.3 Vector Control

Vector control provides more sophisticated motor control than basic scalar control.

It can provide improved torque response and speed regulation, particularly when the motor load changes.

This is useful for conveyors, mills, mixers, compressors, and other machinery where motor performance under changing loads is important.

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10.4 DC-Input Architecture

The DC-input design is a major characteristic of this model.

It allows the drive to be integrated into systems where the DC bus is already available.

This can be useful in common-DC-bus architectures, specialized power systems, and installations where multiple drives share a DC power source.

It also distinguishes this model from the AC-input 20BD875 version.

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10.5 Large Industrial Frame

Frame 10 construction provides the physical and electrical architecture required for this high current rating.

The large enclosure provides space for high-power semiconductor components, cooling equipment, bus structures, power connections, and control hardware.

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10.6 High Short-Term Current Capability

The approximately 963 A one-minute rating and approximately 1313 A three-second rating give the drive additional capacity during transient operating conditions.

This can be important during startup and acceleration of high-inertia loads.

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10.7 24 V I/O

The selected configuration uses 24 V I/O for control.

This provides a familiar control interface for many industrial automation systems.

It can be integrated into control architectures where 24 V signals are used for commands, status, interlocks, and other control functions.

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10.8 No Unnecessary Integrated Options

The N0NNN configuration does not include several optional functions.

There is no internal communication module, no brake IGBT, no drive-mounted brake resistor, and no feedback option.

For systems where these functions are provided elsewhere, this can be an advantage because the drive configuration remains relatively straightforward.

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11. Five Recommended Models from the Same Series or Closely Related Models

The following models are useful when comparing high-power PowerFlex 700 products.

*Weight depends on input architecture and enclosure configuration. These models should not be considered interchangeable solely because their current ratings are similar.

The most closely related model to the 20BH875 is the 20BJ875, because it retains the 875 A rating and the same broad DC-input architecture while moving to a higher DC-voltage class.

The 20BD875 is also a useful comparison, but it is an AC-input model and therefore is not a direct electrical replacement for the 20BH875.

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12. Five Popular or Representative Models from the Same Brand

The following models cover several important PowerFlex families and are useful for comparison when selecting a drive for a different motor size.

These five models are not direct substitutes for the 20BH875.

The difference in current rating is enormous.

The 20BH875 is an approximately 875 A high-power drive, while the models in this comparison represent smaller motor applications.

They are included because they are useful when selecting other products within the same overall industrial-drive portfolio.

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13. High-Power 20B Family Comparison

For applications specifically requiring large PowerFlex 700 drives, the following comparison is useful.

This table highlights an important point.

The 20BH875 is not simply a larger version of a conventional 480 VAC drive.

It is a DC-input high-power configuration, so the upstream power architecture must be compatible with the required DC voltage.

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14. 20BH875 vs 20BD875

This comparison is particularly important because the two model numbers are easy to confuse.

This is one of the most important technical distinctions for maintenance personnel.

Even though both models have 875 A output capability, their input power architecture is different.

Therefore, they should never be treated as interchangeable simply because the current rating is the same.

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15. Installation Considerations

The 20BH875N0NNNNNC0 is a large industrial device and requires significantly more installation planning than a compact variable-frequency drive.

The IP00/open configuration means the drive requires an appropriate protective enclosure or controlled installation environment.

The enclosure should protect the drive from dust, moisture, conductive contamination, accidental contact, and other environmental hazards.

Adequate ventilation is also essential.

High-power semiconductor devices generate significant heat, and the drive’s cooling system must have sufficient airflow to remove this heat.

The cabinet should therefore be designed around the actual heat dissipation requirements rather than simply providing enough physical space for the drive.

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16. Maintenance Considerations

Because of the very high power level, maintenance should be carried out with appropriate industrial electrical safety procedures.

The DC bus is particularly important.

A DC-input drive can have dangerous stored energy even after the upstream power source has been disconnected.

Proper isolation, discharge time, verification of zero energy, grounding procedures, and site-specific lockout/tagout practices should be followed before servicing.

The large Frame 10 assembly also means that mechanical handling is important.

With a drive weight of approximately 305 kg, removing the complete assembly should not be attempted using ordinary manual handling.

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17. Advantages for Existing Industrial Systems

For an existing installation, one of the biggest advantages of the 20BH875 platform is continuity.

A machine that was originally engineered around a PowerFlex 700 drive may already have established motor parameters, control wiring, interlocks, operating procedures, and maintenance practices.

Keeping the same drive family can therefore simplify troubleshooting and maintenance.

This is particularly relevant in large production facilities where unexpected changes to motor-control architecture can lead to additional engineering and commissioning work.

The model is also useful as a reference when investigating replacement options for an older high-power drive.

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18. Application Selection Guide

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19. What Makes the 20BH875N0NNNNNC0 Different

There are several characteristics that distinguish this model from more conventional drives.

First, it is a DC-input drive.

Second, it has an 875 A continuous output rating.

Third, it uses a Frame 10 mechanical construction.

Fourth, it is designed for approximately 500 HP Normal Duty.

Fifth, the specific configuration uses vector control with 24 V I/O but no feedback.

Sixth, it is an IP00/open-type configuration, meaning the final installation must provide appropriate environmental protection.

These characteristics make the model a specialized high-power industrial component rather than a general-purpose inverter.

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20. Key Parameters at a Glance

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21. Overall Evaluation

The 20BH875N0NNNNNC0 is a high-capacity industrial variable-frequency drive designed for large AC motors and DC-bus power systems.

Its 875 A continuous output, 500 HP Normal Duty rating, 400 HP Heavy Duty rating, 540 VDC input architecture, and Frame 10 construction place it firmly in the high-power industrial-drive category.

Its vector-control capability makes it suitable for machinery where stable speed and controlled torque are important.

The DC-input configuration is particularly useful where the electrical system already provides a suitable DC bus.

Its physical size is substantial, with an approximate open-type Frame 10 envelope of 757.8 mm × 2275.8 mm × 591.8 mm and an approximate drive weight of 305 kg.

The open IP00 construction also means that enclosure design and environmental protection must be considered as part of the complete installation.

For applications such as large conveyors, mining machinery, large pumps, fans, blowers, compressors, mills, crushers, mixers, and other high-power process machinery, this type of drive can provide the current capacity and motor-control capability required for demanding operation.

The most important point when selecting a replacement is to distinguish the 20BH875 from the similarly rated 20BD875.

The 20BH875 is a 540 VDC-input model, whereas the 20BD875 is an AC-input model. Even though both are rated at 875 A, their power architectures and application requirements are different.

For maintenance, retrofit, and replacement work, the complete catalog number 20BH875N0NNNNNC0 should therefore be treated as the reference rather than selecting a drive based only on the 875 A rating.

Overall, this model is best characterized as a very high-power, 875 A, 540 VDC-input, vector-controlled industrial drive for large motor systems, with a configuration focused on basic drive control rather than integrated braking, communications, or encoder-feedback functions.