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Allen-Bradley 20G1AJE435AN4NNNNN PowerFlex 755 Air-Cooled AC Drive

1. Product Overview

The Allen-Bradley 20G1AJE435AN4NNNNN is a high-power PowerFlex 755 Series air-cooled AC drive designed for large industrial motor-control applications.

This model is part of the large-frame PowerFlex 755 family and is intended for applications where a conventional compact variable-frequency drive is no longer sufficient because of motor power, current requirements, enclosure requirements, or system integration requirements.

The drive is designed for a 600 VAC, three-phase electrical system and belongs to the Frame 8 power class. Its catalog current class is 435 A, with approximately 500 HP Light Duty, 450 HP Normal Duty, and 350 HP Heavy Duty capability.

The model is configured as an enclosed, industrial packaged drive with an 800 mm deep MCC-style enclosure and a Type 12 / IP54 protection arrangement.

The drive uses an air-cooled power section and is configured with an AC input with precharge and no DC terminals.

The unit also incorporates an EMC filter and uses the CM jumper removed configuration.

A major characteristic of this particular catalog number is the N4 operator-interface configuration. The drive is equipped with an Enhanced LCD Full Numeric HIM, providing local access to drive parameters, operating information, fault information, diagnostics, and commissioning functions.

The combination of high current capacity, large-frame construction, industrial enclosure, local operator interface, filtering, and PowerFlex 755 control architecture makes the product well suited to large pumps, fans, conveyors, compressors, mixers, process machinery, material-handling equipment, and other high-power industrial systems.

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2. Brand and Product Series

Item	Details
Brand	Allen-Bradley
Product Series	PowerFlex 755
Product Family	PowerFlex 755 AC Drives
Product Category	Industrial AC Variable-Frequency Drive
Product Type	Air-Cooled AC Packaged Drive
Model	20G1AJE435AN4NNNNN
Application Class	Large Industrial Motor Control
Installation Type	Enclosed / MCC-Style Industrial Installation
Cooling	Air Cooled
Frame	Frame 8

The PowerFlex 755 series is positioned toward demanding industrial applications where motor-control performance, system integration, diagnostics, and high-power capability are important.

Compared with smaller compact drive families, the PowerFlex 755 platform provides a substantially larger power range and is intended for larger industrial machinery.

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3. Complete Basic Specification

Parameter	Specification
Model	20G1AJE435AN4NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Product Type	Air-Cooled AC Drive
Construction	Packaged / Enclosed Drive
Input Voltage	600 VAC
Input Phase	Three Phase
Catalog Current	435 A
Light Duty Rating	500 HP
Normal Duty Rating	450 HP
Heavy Duty Rating	350 HP
Frame Size	Frame 8
Enclosure	UL Type 12 / IP54
Enclosure Style	800 mm Deep MCC Style
Cooling Method	Air Cooled
Input Type	AC Input with Precharge
DC Terminals	None
Input Filtering	EMC Filter
CM Jumper	Removed
Dynamic Braking	None
HIM	Enhanced LCD Full Numeric HIM
HIM Protection	IP66 / NEMA Type 4X/12 class
Communication	Embedded EtherNet/IP
Installation Environment	Industrial Electrical Room / MCC Area
Approx. Dimensions	Approximately 2100–2500 × 600 × 800 mm
Approx. Weight	Approximately 600–650 kg

The dimensions and weight shown above are suitable for preliminary planning of the large Frame 8 packaged configuration. Final mechanical dimensions, shipping weight, cable-entry arrangement, and maintenance clearances should be confirmed against the exact equipment configuration before installation.

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4. Electrical Specifications

The 20G1AJE435AN4NNNNN is designed around a 600 VAC three-phase input system.

Its catalog current is 435 A.

The drive provides different ratings according to the operating duty classification. This distinction is important because industrial motors do not all operate under the same load profile.

For Light Duty operation, the drive is rated at approximately 500 HP.

For Normal Duty operation, the drive is rated at approximately 450 HP.

For Heavy Duty operation, the drive is rated at approximately 350 HP.

The selection data also indicates approximately 460 A continuous Light Duty, 435 A continuous Normal Duty, and 355 A continuous Heavy Duty for the corresponding 435 A catalog position.

This means that the drive should not be selected simply by comparing motor horsepower with the largest horsepower number printed in a catalog.

Motor full-load current, acceleration torque, overload requirements, load inertia, operating cycle, ambient temperature, and process conditions should all be considered.

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5. Detailed Electrical Parameter Table

Parameter	Specification
Model	20G1AJE435AN4NNNNN
Input Voltage	600 VAC
Input Frequency	Industrial AC supply
Input Phase	3 Phase
Catalog Current	435 A
Frame	Frame 8
Light Duty Continuous Current	Approx. 460 A
Light Duty 1-Minute Current	Approx. 506 A
Light Duty Motor Rating	Approx. 500 HP
Normal Duty Continuous Current	Approx. 435 A
Normal Duty 1-Minute Current	Approx. 479 A
Normal Duty 3-Second Current	Approx. 639 A
Normal Duty Motor Rating	Approx. 450 HP
Heavy Duty Continuous Current	Approx. 355 A
Heavy Duty 1-Minute Current	Approx. 533 A
Heavy Duty 3-Second Current	Approx. 639 A
Heavy Duty Motor Rating	Approx. 350 HP
Input Configuration	AC Input with Precharge
DC Terminals	None
Filtering	EMC Filter
CM Jumper	Removed
Dynamic Braking	None
Cooling	Air Cooled
Communication	Embedded EtherNet/IP
HIM	Enhanced LCD Full Numeric
Enclosure	Type 12 / IP54
MCC Depth	800 mm
Approx. Height	2100–2500 mm
Approx. Width	600 mm
Approx. Depth	800 mm
Approx. Weight	600–650 kg

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6. Product Configuration

The catalog number 20G1AJE435AN4NNNNN identifies a specific configuration within the PowerFlex 755 family.

Catalog Section	General Description
20G	PowerFlex 755 AC drive family
1	Configuration designation
AJE	600 VAC large-frame configuration
435	435 A current class
A	CM jumper removed configuration
N4	Enhanced LCD Full Numeric HIM
NNNNN	Additional configuration positions

The 435 portion is especially important because it identifies the current class.

The A position identifies the CM jumper removed arrangement.

The N4 configuration identifies the Enhanced LCD Full Numeric HIM arrangement.

This means that the 20G1AJE435AN4NNNNN is not simply a 435 A drive; it is a particular combination of power rating, enclosure, common-mode configuration, filtering, and operator-interface configuration.

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7. Frame 8 Construction

The drive uses a Frame 8 power structure.

Frame 8 is intended for high-power applications and requires significantly more physical space than compact drive frames.

The large frame provides the necessary space for:

• High-current power components.
• Power semiconductor assemblies.
• DC bus structures.
• Cooling equipment.
• Input and output connections.
• Control electronics.
• Protection equipment.
• Communication equipment.
• Cabinet ventilation.
• Maintenance access.

Because of the high power level, the physical size of the drive should be considered during the early stages of machine and electrical-room design.

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8. Enclosure and Mechanical Design

The 20G1AJE435AN4NNNNN is configured in an 800 mm deep MCC-style enclosure with Type 12 / IP54 protection.

This makes it substantially different from an open-frame drive that would require a separate cabinet or enclosure designed by the system integrator.

The enclosed configuration is particularly suitable for industrial electrical rooms and centralized motor-control installations.

The cabinet design provides an organized environment for the drive power section and associated equipment.

For installation planning, engineers should consider:

• Cabinet height.
• Cabinet width.
• Cabinet depth.
• Door swing.
• Cable entry.
• Cable bending radius.
• Cooling airflow.
• Service access.
• Front clearance.
• Rear clearance where applicable.
• Lifting and transportation requirements.

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9. Dimensions and Weight

The physical size of this model is an important consideration.

For preliminary engineering planning, the overall packaged configuration can be considered approximately:

Height: 2100–2500 mm

Width: 600 mm

Depth: 800 mm

Weight: approximately 600–650 kg

This is a large and heavy industrial drive.

Transportation and installation should therefore be planned before delivery.

The equipment may require suitable lifting equipment and an appropriate transportation route from the receiving area to the final electrical room.

Floor loading should also be evaluated, particularly when the equipment is installed on raised flooring or an elevated platform.

The final shipping weight may differ depending on the exact packaged configuration and installed options.

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10. Air-Cooled Power Architecture

The drive uses an air-cooled power system.

At this power level, heat management is a major engineering consideration.

The drive dissipates heat during operation, and the internal cooling system is designed to move that heat away from the power electronics.

The installation therefore needs adequate ventilation and thermal management.

Important considerations include:

• Ambient temperature.
• Airflow.
• Cabinet ventilation.
• Cooling-fan operation.
• Air passages.
• Dust accumulation.
• Electrical-room temperature.
• Heat generated by other equipment.
• Preventive maintenance.

In dusty industrial environments, cooling-system maintenance is particularly important.

Dust buildup can restrict airflow and increase the operating temperature of power components.

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11. Enhanced LCD Full Numeric HIM

The N4 configuration includes an Enhanced LCD Full Numeric HIM.

This is one of the most useful features of the model for commissioning and maintenance.

The local operator interface allows personnel to interact directly with the drive.

Typical functions include:

• Viewing drive status.
• Viewing operating parameters.
• Adjusting parameters.
• Reviewing fault information.
• Checking alarm conditions.
• Monitoring motor operation.
• Performing commissioning adjustments.
• Troubleshooting drive operation.
• Checking diagnostic information.

The local interface is particularly useful when the drive is installed in a remote electrical room or in a large industrial machine.

A technician can work directly at the drive without needing to connect an external programming device for every basic maintenance task.

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12. HIM Protection

The HIM configuration is designed for industrial use and is associated with an IP66 / NEMA Type 4X/12 class operator-interface arrangement.

This is useful when the operator interface is exposed to the industrial environment rather than being installed in a clean office environment.

The protected HIM arrangement provides a more robust local interface for:

• Manufacturing areas.
• Process plants.
• Industrial electrical rooms.
• Material-handling facilities.
• Water-treatment installations.
• Heavy machinery.

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13. CM Jumper Removed

The A configuration indicates that the CM jumper is removed.

This is a significant electrical configuration detail.

The common-mode arrangement influences how the drive interacts electrically with the grounding system and motor system.

It can affect considerations such as:

• Common-mode current.
• Grounding.
• EMC performance.
• Motor cable construction.
• Bearing-current considerations.
• Electrical noise.
• Installation compatibility.

When replacing an existing PowerFlex 755 drive, engineers should verify the original CM configuration rather than assuming that every drive in the same current class uses the same arrangement.

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14. EMC Filter

The product includes an EMC filter configuration.

Variable-frequency drives use high-frequency switching to control the motor.

This switching can create electrical noise that may affect nearby instrumentation, control wiring, communication networks, or sensitive electronic equipment if the installation is poorly designed.

The EMC filter is therefore useful as part of the overall electrical-noise-control strategy.

Proper installation should still include:

• Correct grounding.
• Proper cabinet bonding.
• Appropriate motor cable selection.
• Shielding where required.
• Separation of power and control cables.
• Correct cable routing.
• Proper termination practices.

The filter should be regarded as one component of the overall EMC design rather than as a replacement for proper installation practices.

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15. Embedded EtherNet/IP

The 20G1AJE435AN4NNNNN is configured with embedded EtherNet/IP capability.

This is important for integration into modern industrial automation systems.

The drive can be incorporated into an Ethernet-based control architecture for functions such as:

• Start and stop control.
• Speed reference.
• Drive status.
• Fault monitoring.
• Alarm monitoring.
• Motor operating information.
• Parameter access.
• Remote diagnostics.
• Production coordination.
• Automated speed control.

For large plants with many drives, network integration can make centralized monitoring and maintenance considerably easier.

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16. AC Input with Precharge

The drive uses an AC input with precharge configuration.

Precharge is an important part of the high-power drive input architecture.

The precharge function helps manage the initial charging of the DC bus when the drive is energized.

This is particularly important for large drives because the DC-link capacitors represent a substantial electrical energy-storage system.

The drive is also configured with no DC terminals for this catalog arrangement.

This should be considered during system design when evaluating DC bus sharing or other specialized power architectures.

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17. Dynamic Braking

The 20G1AJE435AN4NNNNN is configured with no standard dynamic braking.

This is an important consideration for high-inertia machinery.

When a motor decelerates, mechanical energy can be transferred back toward the drive.

If the application requires rapid deceleration, the energy generated during braking must be managed appropriately.

Applications requiring special braking performance may need an external braking solution or another system architecture.

This should be evaluated for:

• Large conveyors.
• Centrifuges.
• High-inertia fans.
• Large rotating machinery.
• Rapid-cycle production equipment.
• Material-handling systems.

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18. Product Introduction

The PowerFlex 755 series is designed for large industrial motor-control applications.

The 20G1AJE435AN4NNNNN represents a high-power enclosed configuration within this family.

The fundamental function of the drive is to control the speed and torque of a three-phase AC motor.

Instead of connecting a motor directly to a fixed-frequency AC supply and operating it at essentially one normal speed, the variable-frequency drive allows the motor operating conditions to be adjusted electronically.

This provides a major advantage in industrial processes where motor speed needs to change according to production requirements.

For example, a pump can operate at lower speed when process flow demand decreases.

A fan can slow down when ventilation demand is reduced.

A conveyor can change speed according to production rate.

A mixer can operate at different speeds during different processing stages.

This type of speed control is one of the primary reasons industrial plants use variable-frequency drives.

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19. Typical Applications

19.1 Large Pumps

Large pumps are one of the most common applications for high-power AC drives.

The 20G1AJE435AN4NNNNN can be used for suitable pump motors within its electrical and duty ratings.

Typical applications include:

• Water-treatment pumps.
• Industrial circulation pumps.
• Cooling-water pumps.
• Process pumps.
• Large transfer pumps.
• Mining-water systems.
• Industrial irrigation.

Variable-speed operation can provide better process control than fixed-speed operation.

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19.2 Large Fans and Blowers

Large fans and blowers can consume significant electrical power.

A variable-frequency drive allows the airflow to be adjusted according to process requirements.

Typical applications include:

• Furnace fans.
• Industrial ventilation.
• Dust-extraction systems.
• Process-air systems.
• Cooling fans.
• Mining ventilation.
• Large exhaust systems.

The drive can provide controlled acceleration and adjustable operating speed.

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19.3 Mining Conveyors

Mining conveyors often involve large motors, high mechanical inertia, and demanding starting conditions.

The PowerFlex 755 platform is suitable for large conveyor applications where the motor current and duty requirements fall within the applicable rating.

Typical equipment includes:

• Ore conveyors.
• Coal conveyors.
• Aggregate conveyors.
• Bulk-material conveyors.
• Transfer conveyors.
• Port material-handling conveyors.

Controlled acceleration can reduce mechanical shock on belts, gearboxes, couplings, and other mechanical components.

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19.4 Cement Equipment

Cement and aggregate plants contain many large motor loads.

Potential applications include:

• Large process fans.
• Conveyors.
• Material-handling systems.
• Process machinery.
• Grinding-related auxiliary equipment.
• Large dust-extraction systems.

The drive’s high-current capability makes it suitable for large motors used throughout heavy process facilities.

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19.5 Compressors

Large compressors can require substantial starting torque and motor power.

The drive can be used in suitable variable-speed compressor applications.

Potential applications include:

• Industrial air compressors.
• Process compressors.
• Gas-handling equipment.
• Large refrigeration systems.
• Process-air systems.

The final selection should account for compressor torque requirements and actual motor current.

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19.6 Industrial Mixers

Large mixers and agitators may require substantial starting torque, especially when the machine begins operation with material already present.

The drive can provide controlled acceleration and adjustable speed.

Typical applications include:

• Chemical mixing.
• Water treatment.
• Mineral processing.
• Cement processing.
• Batch processing.
• Industrial blending.

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19.7 Extrusion Machinery

Large extrusion systems require stable motor speed and controlled torque.

The PowerFlex 755 platform can be used for suitable extrusion machinery where the motor power is within the applicable drive rating.

Potential applications include:

• Plastic extrusion.
• Rubber processing.
• Material processing.
• Continuous manufacturing.

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19.8 Material Handling

The high-current configuration is suitable for large material-handling systems.

Applications can include:

• Large conveyors.
• Transfer systems.
• Bulk-material equipment.
• Loading systems.
• Production-line transport systems.
• Large mechanical handling equipment.

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20. Product Advantages

20.1 High-Power Capability

The 435 A current class places this drive in the high-power range of the PowerFlex 755 family.

It is designed for motors that are considerably larger than those normally controlled by compact general-purpose drives.

This makes it appropriate for large industrial machinery.

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20.2 600 VAC Three-Phase Architecture

The 600 VAC three-phase configuration is suitable for high-power industrial motor systems.

At higher voltage levels, a given amount of motor power can be transmitted at lower current than would be required at a lower voltage.

This can provide advantages in large motor installations when the overall electrical system is designed accordingly.

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20.3 500 HP Light Duty Rating

The approximate 500 HP Light Duty capability provides a high motor-power range for applications such as large fans, pumps, and other relatively moderate-load machinery.

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20.4 450 HP Normal Duty Rating

The approximately 450 HP Normal Duty rating makes the drive suitable for a broad range of large industrial applications.

Typical applications include:

• Large pumps.
• Large fans.
• Conveyors.
• Process machinery.
• Material-handling systems.

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20.5 350 HP Heavy Duty Rating

The approximately 350 HP Heavy Duty rating is appropriate for machines where overload capability and demanding torque performance are more important.

This can be useful for applications involving:

• High starting torque.
• High inertia.
• Frequent acceleration.
• Variable loading.
• Demanding mechanical conditions.

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20.6 Large Frame 8 Construction

Frame 8 provides the physical and electrical architecture required for high-power motor control.

The large physical size is appropriate for the amount of power being handled.

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20.7 Industrial Enclosure

The Type 12 / IP54 enclosure provides an industrial packaged construction.

This makes the drive suitable for centralized industrial electrical installations where a protected enclosure is required.

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20.8 Local Enhanced LCD HIM

The N4 configuration provides a major advantage during commissioning and maintenance.

A technician can directly access drive information from the front of the equipment.

This is particularly useful during:

• Commissioning.
• Troubleshooting.
• Parameter adjustment.
• Fault investigation.
• Preventive maintenance.

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20.9 Embedded EtherNet/IP

Embedded EtherNet/IP simplifies integration into compatible industrial automation architectures.

The drive can be incorporated into centralized control systems without requiring a separate external communication arrangement for basic network integration.

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20.10 EMC Filter

The EMC filter supports electrical-noise management and can contribute to better compatibility with surrounding control and instrumentation systems when installed correctly.

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20.11 Air-Cooled Design

Air cooling provides a practical thermal-management method for high-power industrial equipment.

It avoids the additional infrastructure associated with liquid cooling.

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21. Advantages for System Integrators

The PowerFlex 755 architecture provides a useful platform for large machine builders and system integrators.

A common drive family can be used across multiple motor sizes.

For example, the same PowerFlex 755 family can be used for:

• Pumps.
• Fans.
• Conveyors.
• Compressors.
• Mixers.
• Process machinery.
• Material-handling systems.

This can simplify engineering and standardization.

A standardized drive platform can also reduce the amount of training required for operators and maintenance personnel.

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22. Advantages for Maintenance Personnel

The Enhanced LCD Full Numeric HIM is particularly useful for maintenance.

When a large machine stops unexpectedly, technicians can access drive information directly at the cabinet.

They can use the local interface to investigate:

• Faults.
• Alarms.
• Drive status.
• Operating parameters.
• Motor-related conditions.
• Configuration information.

This can shorten the time required to determine whether a problem originates from the drive, motor, control system, or process equipment.

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23. Advantages for Plant Standardization

For plants operating multiple large motors, standardizing on the PowerFlex 755 family can provide practical advantages.

Maintenance teams can become familiar with one general drive architecture.

Spare parts can be managed around a smaller number of product families.

Training requirements can also be reduced.

Engineering documentation can follow a consistent structure.

Typical benefits include:

• Simplified commissioning.
• Consistent troubleshooting procedures.
• Easier operator training.
• More organized spare-parts planning.
• Standardized electrical documentation.
• Consistent network architecture.

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24. Related PowerFlex 755 Models

The following five models are closely related to the 20G1AJE435AN4NNNNN and are useful when selecting neighboring current ratings or similar configurations.

Model	Voltage	Catalog Current	Light Duty	Normal Duty	Heavy Duty	Frame	HIM
20G1AJE295AN4NNNNN	600 VAC, 3 PH	295 A	350 HP	300 HP	250 HP	8	Enhanced LCD Full Numeric
20G1AJE355AN4NNNNN	600 VAC, 3 PH	355 A	400 HP	350 HP	300 HP	8	Enhanced LCD Full Numeric
20G1AJE395AN4NNNNN	600 VAC, 3 PH	395 A	450 HP	400 HP	350 HP	8	Enhanced LCD Full Numeric
20G1AJE435AN4NNNNN	600 VAC, 3 PH	435 A	500 HP	450 HP	350 HP	8	Enhanced LCD Full Numeric
20G1AJE460AN4NNNNN	600 VAC, 3 PH	460 A	500 HP	500 HP	400 HP	8	Enhanced LCD Full Numeric

These models form a practical neighboring range around the 435 A configuration.

When choosing among them, the motor nameplate current should be compared with the applicable duty current rather than relying only on horsepower.

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25. Detailed Related-Model Comparison

Model	Catalog Current	LD Current	ND Current	HD Current	LD HP	ND HP	HD HP	Approx. Dimensions	Approx. Weight
20G1AJE295AN4NNNNN	295 A	355 A	295 A	272 A	350 HP	300 HP	250 HP	Approx. 2100–2500 × 600 × 800 mm	600–650 kg
20G1AJE355AN4NNNNN	355 A	395 A	355 A	295 A	400 HP	350 HP	300 HP	Approx. 2100–2500 × 600 × 800 mm	600–650 kg
20G1AJE395AN4NNNNN	395 A	435 A	395 A	329 A	450 HP	400 HP	350 HP	Approx. 2100–2500 × 600 × 800 mm	600–650 kg
20G1AJE435AN4NNNNN	435 A	460 A	435 A	355 A	500 HP	450 HP	350 HP	Approx. 2100–2500 × 600 × 800 mm	600–650 kg
20G1AJE460AN4NNNNN	460 A	510 A	460 A	395 A	500 HP	500 HP	400 HP	Approx. 2100–2500 × 600 × 800 mm	600–650 kg

The current figures in this table are intended to show the relative sizing of the 600 V Frame 8 drive family.

The final drive selection should always be based on the applicable operating duty and actual motor current.

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26. Five Popular Allen-Bradley Models

The following models are useful examples of other widely used Allen-Bradley drive configurations and can be considered when a project requires a different power range or drive family.

Model	Series	Voltage Class	Current / Rating	Typical Application	General Type
25B-D030N114	PowerFlex 525	480 VAC class	30 A class	General industrial machinery	Compact AC drive
25C-D030N114	PowerFlex 527	480 VAC class	30 A class	Machine automation	Compact AC drive
20G1AGC260JN0NNNNN	PowerFlex 755	480 VAC class	260 A class	Large industrial motors	Frame 8 AC drive
20G1AGC302JA0NNNNN	PowerFlex 755	480 VAC class	302 A class	Large process machinery	Large-frame AC drive
20G1AGE053JA0NNNNN	PowerFlex 755	480 VAC class	53 A class	Medium/high-power machinery	PowerFlex 755 AC drive

These five models are not direct electrical replacements for the 20G1AJE435AN4NNNNN.

They represent different power levels, voltage classes, frame arrangements, and applications.

They are useful as broader same-brand alternatives when designing a new machine or selecting a drive for a different motor size.

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27. Application Selection Table

Application	Suitability	Main Reason
Large Water Pump	Excellent	High-power variable-speed control
Large Cooling Pump	Excellent	High-current motor control
Large Fan	Excellent	Variable-speed airflow control
Industrial Blower	Excellent	High-power continuous operation
Mining Conveyor	Excellent	High current and controlled acceleration
Cement Conveyor	Excellent	Large industrial motor capacity
Bulk Material Conveyor	Excellent	Large motor and variable-speed operation
Large Compressor	Very Good	High-power AC motor control
Industrial Mixer	Excellent	Controlled speed and torque
Process Machinery	Excellent	Flexible high-power drive platform
Material Handling	Excellent	Large motor capacity
Small Pump	Not Recommended	Drive is substantially oversized
Small Fan	Not Recommended	Smaller drive would be more practical
Small Machine	Not Recommended	Physical and electrical capacity are excessive

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28. Installation Considerations

A drive of this size should be included in the mechanical and electrical design from the beginning of the project.

The following electrical parameters should be checked:

• Incoming voltage.
• Three-phase supply.
• Available fault current.
• Protective-device coordination.
• Grounding system.
• Motor rated voltage.
• Motor full-load current.
• Motor power.
• Motor cable size.
• Motor cable length.
• EMC requirements.

The mechanical installation should also consider:

• Equipment-room dimensions.
• Cabinet height.
• Cabinet width.
• Cabinet depth.
• Front access.
• Door opening.
• Cable routing.
• Cable bending radius.
• Floor loading.
• Lifting access.
• Maintenance clearance.
• Ventilation.

The approximate 600–650 kg equipment weight is significant and should be considered during transportation and installation planning.

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29. Thermal Management

Thermal management is one of the most important considerations for a large air-cooled drive.

The equipment should not be installed in a location where hot air can accumulate around the drive.

The electrical room should provide adequate ventilation.

Important factors include:

• Ambient temperature.
• Air exchange.
• Heat generated by adjacent equipment.
• Cooling-fan condition.
• Dust accumulation.
• Cabinet airflow.
• Air inlet condition.
• Air outlet condition.

If the drive is installed in a dusty environment, periodic cleaning and inspection become particularly important.

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30. Preventive Maintenance

A large Frame 8 drive should be included in a structured preventive-maintenance program.

Typical maintenance activities include:

• Inspecting cooling fans.
• Checking ventilation paths.
• Removing accumulated dust.
• Inspecting electrical connections.
• Checking grounding connections.
• Inspecting motor cables.
• Checking communication connections.
• Reviewing fault history.
• Reviewing alarm history.
• Monitoring abnormal temperatures.
• Inspecting cabinet condition.
• Checking operator-interface operation.
• Looking for signs of overheating.

Preventive maintenance is particularly important for high-power drives because a drive failure can cause substantial production downtime.

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31. Duty Selection

The drive has three important application categories.

Light Duty – Approximately 500 HP

Light Duty operation provides the highest horsepower rating.

This is appropriate for applications where the load profile does not require the same overload capability associated with Heavy Duty operation.

Typical applications can include large fans and suitable pump systems.

Normal Duty – Approximately 450 HP

Normal Duty provides a balanced combination of motor horsepower and overload capability.

This is appropriate for many general industrial applications.

Typical examples include:

• Pumps.
• Fans.
• Conveyors.
• Process machinery.
• Material-handling systems.

Heavy Duty – Approximately 350 HP

Heavy Duty provides a lower continuous horsepower rating but greater emphasis on overload performance.

This is useful for applications involving:

• High starting torque.
• High inertia.
• Frequent acceleration.
• Variable mechanical loads.
• More demanding operating cycles.

The correct duty category should always be determined from the actual machine characteristics.

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32. Why Current Is More Important Than Horsepower Alone

Horsepower is useful for preliminary drive selection, but it is not sufficient by itself.

Two motors with the same horsepower can have different full-load currents depending on:

• Motor efficiency.
• Motor power factor.
• Motor voltage.
• Motor construction.
• Motor design.
• Operating conditions.

For this reason, the motor nameplate current should be compared with the applicable continuous drive-current rating.

The load profile should also be evaluated.

A machine with frequent acceleration may require a larger drive than a machine with a steady load even if both machines use motors with similar horsepower ratings.

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33. Replacement Considerations

When replacing a 20G1AJE435AN4NNNNN, engineers should verify the entire catalog configuration.

Important items include:

• 600 VAC voltage class.
• 435 A current class.
• Frame 8.
• Type 12 / IP54 enclosure.
• 800 mm MCC depth.
• EMC filter.
• CM jumper removed.
• Enhanced LCD Full Numeric HIM.
• AC input with precharge.
• No DC terminals.
• No dynamic braking.
• Embedded EtherNet/IP.

A replacement with a different CM-jumper configuration or different HIM arrangement may require additional engineering checks.

The replacement should therefore be treated as a complete configuration rather than simply matching the first few digits of the catalog number.

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34. Comparison with the No-HIM Version

One of the closest related configurations is the 20G1AJE435AN0NNNNN.

Feature	20G1AJE435AN4NNNNN	20G1AJE435AN0NNNNN
Voltage	600 VAC	600 VAC
Catalog Current	435 A	435 A
Frame	8	8
Light Duty	500 HP	500 HP
Normal Duty	450 HP	450 HP
Heavy Duty	350 HP	350 HP
Enclosure	Type 12 / IP54	Type 12 / IP54
Cooling	Air Cooled	Air Cooled
EMC Filter	Yes	Yes
CM Jumper	Removed	Removed
Dynamic Braking	None	None
HIM	Enhanced LCD Full Numeric	No HIM
EtherNet/IP	Embedded	Embedded
Approx. Dimensions	2100–2500 × 600 × 800 mm	2100–2500 × 600 × 800 mm
Approx. Weight	600–650 kg	600–650 kg

The principal difference is the local operator interface.

The N4 version is more suitable when local operation, commissioning, and maintenance through the drive-mounted interface are important.

The N0 version is more suitable when the system already provides centralized operator control.

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35. Comparison with the JN4 Configuration

Another closely related model is the 20G1AJE435JN4NNNNN.

Feature	20G1AJE435AN4NNNNN	20G1AJE435JN4NNNNN
Voltage	600 VAC	600 VAC
Current	435 A	435 A
Frame	8	8
Light Duty	500 HP	500 HP
Normal Duty	450 HP	450 HP
Heavy Duty	350 HP	350 HP
HIM	Enhanced LCD Full Numeric	Enhanced LCD Full Numeric
EMC Filter	Yes	Yes
CM Jumper	Removed	Installed
Dynamic Braking	None	None
Enclosure	Type 12 / IP54	Type 12 / IP54
Cooling	Air Cooled	Air Cooled
Approx. Dimensions	2100–2500 × 600 × 800 mm	2100–2500 × 600 × 800 mm
Approx. Weight	600–650 kg	600–650 kg

The important distinction is the CM jumper configuration.

The AN4 configuration has the CM jumper removed.

The JN4 configuration has the CM jumper installed.

This distinction should be checked carefully when replacing an existing drive.

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36. Industries Suitable for This Product

The 20G1AJE435AN4NNNNN is suitable for a wide range of heavy industrial sectors.

Industry	Typical Equipment
Mining	Conveyors, pumps, fans, material handling
Cement	Conveyors, fans, process equipment
Water Treatment	Large pumps and blowers
Steel	Fans, pumps, process machinery
Chemical Processing	Pumps, mixers, compressors
Pulp and Paper	Pumps, fans, process equipment
Manufacturing	Large production machinery
Material Handling	Conveyors and transfer systems
Utilities	Large pumps and auxiliary machinery
Industrial HVAC	Large fans and pumps
Aggregate Processing	Conveyors, fans, process machinery
General Process Industry	Large AC motor loads

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37. Main Technical Advantages at a Glance

Advantage	Description
High Current	435 A catalog current class
High Motor Power	Up to approximately 500 HP Light Duty
600 V Architecture	Suitable for high-power three-phase systems
Frame 8	Large industrial power structure
Air Cooling	Practical thermal-management architecture
Type 12 / IP54	Industrial enclosed construction
800 mm MCC Style	Suitable for centralized industrial installations
Enhanced HIM	Local configuration and diagnostics
EtherNet/IP	Industrial network integration
EMC Filter	Supports EMC-conscious installations
CM Jumper Removed	Defined common-mode configuration
Precharge	Suitable high-power input architecture
No DC Terminals	Defined AC-input configuration
No Dynamic Braking	Simplified base configuration
PowerFlex 755	Established high-power drive platform

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38. Overall Product Assessment

The Allen-Bradley 20G1AJE435AN4NNNNN is a high-capacity industrial AC drive intended for large three-phase motors and demanding process equipment.

Its combination of 600 VAC operation, 435 A current class, 500 HP Light Duty capability, 450 HP Normal Duty capability, 350 HP Heavy Duty capability, Frame 8 construction, air cooling, Type 12/IP54 enclosure, 800 mm MCC-style packaging, EMC filtering, CM jumper removed configuration, embedded EtherNet/IP, and Enhanced LCD Full Numeric HIM makes it a strong solution for large industrial motor-control systems.

The model is particularly well suited to applications where a large motor must be controlled continuously and reliably while maintaining adjustable speed, controlled acceleration, process flexibility, and local access to drive information.

For large pumps, fans, conveyors, compressors, mixers, material-handling machinery, and process equipment, the product provides the electrical capacity and physical construction expected from a large-frame industrial drive.

The Enhanced LCD Full Numeric HIM is a major practical advantage for commissioning and maintenance.

Technicians can access drive information directly at the equipment, which can be especially valuable during troubleshooting and startup.

The embedded EtherNet/IP capability also makes the drive suitable for integration into larger automation systems where drive commands, status information, diagnostics, and operating data need to be exchanged with a central control system.

The EMC filter and CM jumper removed configuration should be considered as part of the overall electrical-system design.

The drive should be installed with appropriate grounding, motor-cable selection, shielding, cable routing, and control-system practices.

From a mechanical standpoint, the approximately 2100–2500 mm height, 600 mm width, 800 mm depth, and 600–650 kg planning weight make this a substantial piece of industrial equipment.

Transportation, floor loading, ventilation, lifting, cable routing, and maintenance access should therefore be considered before installation.

The most important point during drive selection is to match the drive to the actual motor current and machine duty.

The 500 HP Light Duty rating should not automatically be used for every 500 HP motor.

Likewise, a motor operating in a high-inertia or high-torque application may require the Heavy Duty rating to be used as the primary selection criterion.

The motor nameplate current, acceleration requirements, overload requirements, operating cycle, environmental conditions, and mechanical load should all be evaluated.

For plants with multiple large motors, the PowerFlex 755 family also provides a useful basis for equipment standardization.

Using related Frame 8 models such as the 295 A, 355 A, 395 A, 435 A, and 460 A configurations allows engineers to select different power capacities while retaining a common general drive architecture.

Overall, the 20G1AJE435AN4NNNNN can be regarded as a large-frame, high-power, enclosed PowerFlex 755 solution intended for demanding industrial motor-control applications where power capacity, local diagnostics, industrial construction, and automation-system integration are important.

For final engineering and procurement, the actual motor nameplate, project electrical requirements, environmental conditions, final dimensional drawing, exact shipping weight, and complete catalog configuration should be used as the controlling information.