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Allen-Bradley 20G11BC1K4AN4NNNNN — Detailed Product Specifications, Introduction, Applications, Advantages and Recommended Models

1. Product Overview

The 20G11BC1K4AN4NNNNN is a high-power Allen-Bradley PowerFlex 755 AC Drive designed for large industrial motor-control applications.

It belongs to the PowerFlex 755 series and the 755 AC Packaged Drive family. This configuration is an air-cooled, high-current drive intended for large three-phase AC motors used in demanding industrial processes.

The exact catalog number is identified as a PowerFlex Air Cooled 755 AC Drive. Its catalog configuration includes an EMC filter and AC input with precharge, while dynamic braking is not included.

The 20G11BC1K4AN4NNNNN is a particularly large drive configuration. It is intended for applications where the motor current is far beyond the range of compact machine drives, making it more appropriate for large pumps, fans, blowers, conveyors, process equipment, mining systems and other major industrial loads.

One important point is that this exact AN4 catalog configuration has been discontinued. The listed direct replacement is 20G11BC1K4JN4NNNNN, so the AN4 model is primarily relevant when identifying existing equipment, replacing installed equipment, checking legacy systems or sourcing a replacement for an older installation.

2. Brand and Series

Item	Specification
Model	20G11BC1K4AN4NNNNN
Brand	Allen-Bradley
Product family	PowerFlex
Series	PowerFlex 755
Product type	High-Power AC Variable Frequency Drive
Sub-family	755 AC Packaged Drive
Cooling	Air cooled
Frame	Frame 9
Voltage class	400 V AC
Input	Three-phase AC
Current class	Approximately 1,465 A
Normal Duty	Approximately 800 kW
Heavy Duty	Approximately 630 kW
Light Duty	Approximately 850 kW class
Enclosure	IP20 / Type 1 class
Cabinet style	600 mm deep MCC style
Input configuration	AC input with precharge
EMC filter	Yes
Dynamic braking	None
HIM configuration	AN4 configuration
Product status	Discontinued
Direct replacement	20G11BC1K4JN4NNNNN

The exact product page identifies the catalog number as a PowerFlex Air Cooled 755 AC Drive and identifies the product as part of the 755 AC Packaged Drive / PowerFlex family.

3. Complete Technical Parameter Table

Parameter	Specification
Model	20G11BC1K4AN4NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Product category	AC Drive
Product family	PowerFlex 750-Series
Packaged-drive family	755 AC Packaged Drive
Cooling method	Air cooled / forced air
Input voltage	400 V AC class
Input phase	3 phase
Input frequency	50/60 Hz class
Output phase	3 phase
Output current	Approximately 1,465 A
Light Duty rating	Approximately 850 kW class
Normal Duty rating	800 kW
Heavy Duty rating	630 kW
Frame	Frame 9
Enclosure	IP20 / Type 1
Cabinet style	600 mm Deep MCC Style
Input type	AC Input with Precharge
EMC filter	Yes
CM configuration	Configuration-specific
Dynamic braking	None
Operator interface	AN4 configuration
Communication	Embedded EtherNet/IP class
Depth	600 mm class
Overall height	Configuration dependent
Overall width	Configuration dependent
Approximate weight (kg)	Approximately 1,270 kg class
Installation	Industrial electrical room / MCC
Product status	Discontinued
Direct replacement	20G11BC1K4JN4NNNNN

The exact product page confirms the EMC-filtered AC-input-with-precharge configuration and the absence of a dynamic-braking option.

For the physical dimensions, the 600 mm depth is the useful catalog-level planning dimension for this MCC-style Frame 9 arrangement. Exact overall height and width should be taken from the mechanical drawing for the specific packaged configuration rather than estimated from the frame designation.

4. Product Introduction

The 20G11BC1K4AN4NNNNN is designed for applications where a conventional small or medium VFD is simply not large enough.

Its approximately 1,465 A current class places it in the high-power industrial category. The drive is intended to control large AC motors while providing variable-speed operation, controlled acceleration and deceleration, process coordination and integration into an industrial automation system.

The PowerFlex 755 architecture is particularly suitable for plants where drive control needs to be integrated with PLCs, HMIs, SCADA systems and industrial communication networks.

Instead of operating a large motor continuously at a fixed speed, the drive can adjust motor speed according to actual process requirements.

That capability is particularly useful for pumps, fans and blowers, where process demand can change considerably throughout the operating day.

5. High-Power Drive Architecture

The 20G11BC1K4AN4NNNNN should be considered a complete high-power motor-control solution rather than simply a frequency converter.

The system normally consists of several major functional sections:

Three-Phase AC Supply

↓

Input Protection and Precharge

↓

Power Conversion Section

↓

DC Link

↓

Inverter Section

↓

Three-Phase AC Motor

↓

Industrial Process Equipment

The control system continuously manages the motor output according to the selected operating mode and application requirements.

6. Electrical Rating

The main electrical characteristic of the model is its approximately 1,465 A output-current capacity.

This makes the drive suitable for very large industrial motors.

The approximate duty ratings can be summarized as follows:

Duty Rating	Approximate Capacity
Light Duty	850 kW class
Normal Duty	800 kW
Heavy Duty	630 kW
Output current	Approximately 1,465 A
Voltage class	400 V AC
Input	3 phase

For an actual project, the motor nameplate current should always be compared with the drive’s applicable duty rating.

Motor power in kW alone is not enough to determine the correct drive size.

7. Normal Duty Rating

The 800 kW Normal Duty rating is particularly important when evaluating this model.

Normal Duty applications are typically associated with continuous industrial loads that do not require the higher overload characteristics associated with more demanding Heavy Duty applications.

Typical examples include:

• Large centrifugal pumps.
• Large ventilation fans.
• Cooling-water systems.
• Industrial blowers.
• Certain conveyors.
• Process circulation systems.

8. Heavy Duty Rating

The 630 kW Heavy Duty rating provides a useful reference for applications with higher torque or overload requirements.

Heavy Duty selection becomes important when the motor experiences demanding conditions such as:

• High starting torque.
• Frequent acceleration.
• High mechanical inertia.
• Rapid changes in load.
• Higher overload demand.
• Difficult conveyor starting conditions.
• Certain mining and process applications.

A motor with a nameplate rating below the Heavy Duty rating may still require careful evaluation if the mechanical load is severe.

9. Light Duty Rating

The drive can also support a higher power level in less demanding Light Duty applications.

The approximately 850 kW Light Duty class makes it useful for applications where the motor load profile is relatively smooth and the required overload is lower.

Large centrifugal fan and pump applications are common examples where Light Duty characteristics can be particularly relevant.

10. 400 V AC Three-Phase Configuration

The model belongs to the 400 V AC three-phase class.

This voltage class is widely used in industrial plants and large motor systems.

The three-phase configuration makes the drive suitable for large industrial motors rather than small single-phase machinery.

Typical electrical arrangements include:

400 V AC Three-Phase Supply

↓

PowerFlex 755

↓

400 V-Class AC Motor

↓

Industrial Load

11. Frame 9 Design

The drive uses a Frame 9 construction.

Frame 9 is intended for large-power applications and provides the physical space necessary for high-current power components, cooling equipment, control electronics and large electrical connections.

This is why the equipment is substantially larger and heavier than compact drives.

A Frame 9 drive should therefore be treated as major electrical equipment during engineering, transportation and installation.

12. 600 mm MCC-Style Construction

The model uses a 600 mm deep MCC-style arrangement.

The 600 mm dimension is important when planning the installation cabinet and electrical-room layout.

Mechanical Item	Approximate Specification
Model	20G11BC1K4AN4NNNNN
Frame	Frame 9
Cabinet style	MCC style
Depth	600 mm
Cooling	Air cooled
Protection	IP20 / Type 1 class
Height	Configuration dependent
Width	Configuration dependent
Installation	Electrical cabinet / MCC environment

For engineering drawings, the exact height and width should be confirmed against the specific mechanical drawing associated with the catalog configuration.

13. Dimensions

The 600 mm depth is the key published cabinet dimension associated with this style of high-power Frame 9 arrangement.

However, it would not be good engineering practice to invent an exact height and width when the final packaged configuration can affect the mechanical envelope.

Therefore, the dimensional information should be handled as follows:

Dimension	Value
Depth	600 mm class
Height	Configuration dependent
Width	Configuration dependent
Frame	Frame 9
Cabinet style	MCC style
Cooling	Air cooled

For actual cabinet fabrication, transportation and installation, the final mechanical drawing should be used.

14. Weight

This is a very heavy industrial drive.

For planning purposes, the Frame 9 configuration should be treated as being in approximately the 1,270 kg class.

Weight Information	Approximate Value
Model	20G11BC1K4AN4NNNNN
Approximate weight	~1,270 kg
Approximate metric tons	~1.27 t
Equipment class	Heavy industrial electrical equipment
Transportation	Heavy-duty handling required
Floor loading	Must be checked
Lifting	Appropriate lifting equipment required

The weight should be considered an approximate engineering-planning value rather than a guaranteed shipping weight.

Actual shipping weight can vary depending on the packaged arrangement, accessories, enclosure configuration and supplied equipment.

15. Cooling System

The drive uses an air-cooled design.

Air cooling is practical for large industrial electrical rooms, but it does not eliminate the need for thermal planning.

A drive of this size generates significant heat.

The installation should therefore consider:

• Room ventilation.
• Heat extraction.
• Ambient temperature.
• Airflow.
• Dust accumulation.
• Cooling-fan condition.
• Cabinet temperature.
• Maintenance access.

16. EMC Filter

The exact model is configured with an EMC filter.

This is useful in industrial installations where electromagnetic compatibility is important.

The EMC filter helps control high-frequency electrical noise associated with the drive’s switching operation.

However, an EMC filter should not be viewed as a complete EMC solution by itself.

Good installation practice should also include:

• Proper grounding.
• Cabinet bonding.
• Appropriate motor-cable selection.
• Shielding where required.
• Separation of power and control cables.
• Appropriate communication-cable routing.

17. AC Input With Precharge

The catalog configuration specifies AC input with precharge.

Precharge is particularly important in large drives because the DC-link capacitors represent a significant electrical load when the drive is energized.

A controlled precharge sequence helps manage the initial charging process.

This is one of the important differences between a large industrial drive and a small machine-mounted inverter.

18. Dynamic Braking

The exact product configuration is listed with no dynamic-braking transistor.

This does not mean that the drive cannot be used in every application involving deceleration.

Instead, the application needs to be evaluated according to its inertia, stopping requirements and regenerative energy.

Applications with relatively slow deceleration may not require a braking system.

Applications involving rapid stopping or high-inertia loads require more detailed braking analysis.

19. Operator Interface

The AN4 portion of the catalog number represents a different configuration from the previously discussed AN0 arrangement.

The exact catalog number should therefore be treated as a complete configuration rather than assuming that every 20G11BC1K4 model has identical operator-interface characteristics.

This is important when ordering replacement equipment.

The last configuration characters should be matched carefully because they can affect options such as the operator interface and other packaged-drive features.

20. Industrial Communication

The PowerFlex 755 family is designed for integration with industrial automation systems.

A typical control arrangement may include:

PLC

↓

Industrial Ethernet

↓

PowerFlex 755

↓

Large AC Motor

↓

Pump / Fan / Conveyor / Process Equipment

This architecture is particularly useful for large plants where the motor drive must exchange status and control information with the central automation system.

21. Product Applications

Application	Suitability
Large water pumps	Excellent
Wastewater pumps	Excellent
Cooling-water pumps	Excellent
Large centrifugal fans	Excellent
Industrial blowers	Excellent
Large conveyors	Excellent
Mining equipment	Excellent
Cement equipment	Excellent
Process pumps	Excellent
Industrial ventilation	Excellent
Material handling	Excellent
Large circulation systems	Excellent
High-inertia equipment	Requires braking evaluation
Compressor systems	Application dependent

22. Application — Water Treatment

Large water-treatment plants can contain many high-power motors.

The 20G11BC1K4AN4NNNNN can be considered for:

• Raw-water pumps.
• Transfer pumps.
• High-lift pumps.
• Cooling-water pumps.
• Process circulation.
• Large blowers.
• Industrial wastewater systems.

The ability to regulate motor speed allows the pump to respond to changing process conditions rather than simply operating at full speed.

23. Application — Large Pumping Stations

Large pumping stations often operate under variable demand.

For example, the required water flow may be low during one operating period and much higher later.

Variable-speed operation allows the motor speed to follow the required process condition.

This can provide:

• Better process control.
• Smoother starting.
• Reduced mechanical shock.
• More flexible operation.
• Centralized monitoring.
• Easier integration with plant automation.

24. Application — Cooling-Water Systems

Large industrial plants often rely on cooling-water systems for:

• Heat exchangers.
• Furnaces.
• Compressors.
• Production equipment.
• Cooling towers.
• Process machinery.

The drive can adjust pump speed according to cooling demand.

This can make the overall system more responsive than a fixed-speed motor combined only with mechanical throttling.

25. Application — Large Fans

Large industrial fans can consume substantial amounts of power.

Potential applications include:

• Furnace exhaust.
• Dust collection.
• Industrial ventilation.
• Mine ventilation.
• Tunnel ventilation.
• Process exhaust.
• Cooling systems.

Variable-speed operation allows airflow to be adjusted according to process requirements.

26. Application — Blowers

Industrial blowers are another suitable application.

Examples include:

• Wastewater aeration.
• Pneumatic material handling.
• Combustion air.
• Process gas circulation.
• Industrial ventilation.
• Dust-control systems.

A high-current drive is useful where the blower motor is very large and continuous operation is required.

27. Application — Mining

Mining environments can contain very large motors.

Possible applications include:

• Long conveyors.
• Dewatering pumps.
• Ventilation fans.
• Material handling.
• Mineral-processing systems.
• Large auxiliary machinery.

Mining applications should receive additional attention regarding dust, vibration, ambient temperature and maintenance access.

28. Application — Cement and Aggregate

Cement and aggregate plants often contain large rotating equipment.

The drive can be considered for:

• Large fans.
• Conveyors.
• Process pumps.
• Blowers.
• Material-handling equipment.
• Dust-collection systems.
• Auxiliary process machinery.

The high-current capacity is particularly valuable when motors are in the several-hundred-kilowatt range.

29. Application — Conveyor Systems

Large conveyors can have substantial mechanical inertia.

The drive can provide controlled acceleration rather than simply applying full motor voltage and frequency immediately.

This can reduce mechanical stress on:

• Conveyor belts.
• Couplings.
• Gearboxes.
• Shafts.
• Bearings.
• Mechanical transmission components.

30. Application — Industrial Ventilation

Industrial ventilation systems often operate under changing airflow requirements.

A variable-speed drive can adjust the fan speed to match the actual ventilation requirement.

This is particularly useful in:

• Factories.
• Tunnels.
• Mining facilities.
• Process plants.
• Large warehouses.
• Cement facilities.

31. Main Product Advantages

Advantage	Description
High current capacity	Approximately 1,465 A
High Normal Duty capacity	800 kW
High Light Duty capacity	Approximately 850 kW class
Heavy Duty capacity	630 kW
Frame 9	Designed for very large industrial motors
Air cooling	Suitable for engineered industrial electrical rooms
400 V AC class	Suitable for common industrial three-phase systems
600 mm MCC depth	Convenient for MCC-style installations
EMC filtering	Supports electromagnetic-compatibility requirements
AC precharge	Suitable for large DC-link systems
PowerFlex 755 platform	Broad industrial application range
Industrial networking	Suitable for centralized automation
Large rating range	Useful for demanding process equipment

32. Advantage — High Current Capability

The approximately 1,465 A current capability is the most obvious strength of this drive.

It allows the drive to serve motors that are far beyond the practical range of compact VFDs.

This makes the model suitable for major plant equipment rather than small machine applications.

33. Advantage — Large Motor Compatibility

Large industrial motors can be expensive to start and stop repeatedly.

Controlled variable-speed operation allows the drive to manage the motor in a more controlled manner.

This is especially valuable when the mechanical system has substantial inertia.

34. Advantage — Smooth Acceleration

A direct-on-line motor start can produce high starting current and significant mechanical stress.

A properly configured variable-speed drive can accelerate the motor progressively.

This can reduce stress on:

• Motor windings.
• Couplings.
• Gearboxes.
• Pumps.
• Belts.
• Conveyor systems.

35. Advantage — Process Control

Variable-speed control provides more than motor protection.

It can become part of the process itself.

For example:

Pressure Setpoint

↓

PLC / Controller

↓

Drive Speed Reference

↓

Motor Speed

↓

Pump Output

This type of architecture is common in automated industrial processes.

36. Advantage — Centralized Automation

Large industrial plants frequently place operators in a control room rather than beside each motor.

The PowerFlex 755 platform fits well into this architecture.

The operator can monitor:

• Speed.
• Current.
• Frequency.
• Status.
• Faults.
• Alarms.
• Process values.

without physically standing beside the drive.

37. Advantage — Air-Cooled Construction

Air cooling avoids the complexity of a liquid-cooling loop.

There is no dedicated coolant circuit to maintain.

However, the electrical-room ventilation system must be capable of removing the generated heat.

This makes room-level thermal design particularly important.

38. Advantage — Industrial Standardization

A plant using multiple PowerFlex 755 drives can standardize maintenance procedures.

Maintenance personnel can become familiar with:

• Similar parameter structures.
• Similar diagnostics.
• Similar communication architecture.
• Similar spare parts.
• Similar commissioning procedures.

This can reduce training complexity in large facilities.

39. Advantage — EMC Configuration

The integrated EMC filter is useful for installations where electrical noise needs to be managed.

This is particularly important in plants containing:

• PLC networks.
• Ethernet communication.
• Sensitive instrumentation.
• Measurement systems.
• Process-control equipment.
• Multiple variable-frequency drives.

40. Advantages for Pump Applications

For large pumps, the main advantages include:

• Variable flow control.
• Pressure control.
• Controlled starting.
• Reduced mechanical shock.
• Centralized monitoring.
• Process automation.
• Flexible operating speed.
• Easier coordination between multiple pumps.

41. Advantages for Fan Applications

For fans, the main advantages include:

• Adjustable airflow.
• Controlled acceleration.
• Reduced unnecessary full-speed operation.
• Process-pressure control.
• Centralized monitoring.
• Easy speed adjustment.
• Automation-system integration.

42. Advantages for Conveyor Applications

For conveyors, the major advantages include:

• Smooth acceleration.
• Controlled speed.
• Better process coordination.
• Reduced mechanical shock.
• Centralized diagnostics.
• Improved control of large rotating systems.

43. Installation Requirements

A drive of this size requires significantly more planning than a small VFD.

The installation should consider:

• Incoming transformer capacity.
• Short-circuit current.
• Protection coordination.
• Cable size.
• Grounding.
• EMC.
• Motor-cable length.
• Ventilation.
• Service clearance.
• Cabinet arrangement.
• Floor loading.
• Transportation.
• Lifting.

44. Electrical Room Requirements

The electrical room should have sufficient capacity for:

• Heat removal.
• Air circulation.
• Maintenance access.
• Cable installation.
• Electrical isolation.
• Safe working space.

The 600 mm cabinet depth should be considered during the initial electrical-room layout.

45. Heat Dissipation

The larger the drive, the more important thermal management becomes.

The installation should prevent:

• Excessive room temperature.
• Blocked airflow.
• Dust accumulation.
• Cooling-fan obstruction.
• Recirculation of hot air.

A well-designed electrical room should remove heat continuously rather than relying only on the drive’s internal fans.

46. Maintenance Recommendations

A practical maintenance program should include:

Maintenance Item	Recommended Check
Cooling fans	Inspect operation
Air passages	Keep clean
Cabinet	Check dust accumulation
Power connections	Inspect for abnormal heating
Grounding	Verify continuity
Control wiring	Inspect connections
Communication	Check network stability
Fault history	Review regularly
Motor cable	Inspect insulation and termination
Parameter backup	Maintain current backup
Ambient temperature	Monitor
Vibration	Investigate unusual changes

47. Parameter Backup

Large industrial drives should have their operating parameters backed up.

A useful backup should include:

• Motor voltage.
• Motor current.
• Motor frequency.
• Motor speed.
• Acceleration time.
• Deceleration time.
• Minimum speed.
• Maximum speed.
• Control mode.
• Start-command source.
• Speed-reference source.
• Network settings.
• Fault configuration.
• Process-control settings.

48. Commissioning Procedure

The commissioning process should normally begin with the electrical system rather than immediately running the motor.

Step 1 — Verify the Catalog Number

Confirm:

20G11BC1K4AN4NNNNN

The complete catalog number matters because configuration suffixes can change important options.

Step 2 — Verify the Supply

Check:

• Voltage.
• Phase.
• Frequency.
• Grounding.
• Protective equipment.

Step 3 — Verify the Motor

Check the motor nameplate for:

• Voltage.
• Current.
• Frequency.
• Power.
• Speed.
• Power factor.
• Efficiency.

Step 4 — Configure Motor Data

Enter the correct motor information.

Do not copy settings from another motor without checking compatibility.

Step 5 — Check Rotation

Perform a controlled rotation check before connecting the motor to the full process.

Step 6 — Perform a Low-Speed Test

Monitor:

• Current.
• Frequency.
• Speed.
• Vibration.
• Noise.
• Drive status.

Step 7 — Increase Speed Gradually

Observe the motor and mechanical equipment throughout the speed range.

Step 8 — Test the Automation Network

Verify:

• Start command.
• Stop command.
• Speed reference.
• Status feedback.
• Fault feedback.
• HMI indication.

49. Same-Series / Related Model Recommendations

The following models are useful alternatives within the PowerFlex 755 family.

Model	Voltage	Current Class	Normal Duty	Heavy Duty	Frame	Depth	Approx. Weight
20G11BC910AN4NNNNN	400 V	~910 A	~500 kW	~400 kW	9	600 mm	~1,250 kg class
20G11BC1K0AN4NNNNN	400 V	~1,045 A	~560 kW	~500 kW	9	600 mm	~1,250 kg class
20G11BC1K2AN4NNNNN	400 V	1,175 A	710 kW	560 kW	9	600 mm	~1,250 kg class
20G11BC1K4JN4NNNNN	400 V	1,465 A	800 kW	630 kW	9	600 mm	~1,270 kg class
20G11BC1K5JN4NNNNN	400 V	~1,480 A	~850 kW	~710 kW	9	600 mm	Configuration dependent

The PowerFlex 755 catalog contains closely related BC1K0, BC1K2, BC1K4 and BC1K5 configurations, as well as multiple AN and JN option variants.

50. Recommended Model 1 — 20G11BC910AN4NNNNN

The 20G11BC910AN4NNNNN is a lower-current member of the same general PowerFlex 755 family.

Parameter	Specification
Model	20G11BC910AN4NNNNN
Series	PowerFlex 755
Voltage	400 V AC class
Output current	Approximately 910 A
Normal Duty	Approximately 500 kW
Heavy Duty	Approximately 400 kW
Frame	Frame 9
Cooling	Air cooled
Enclosure	IP20 / Type 1 class
Cabinet	600 mm MCC style
EMC filter	Yes
Dynamic braking	None
Depth	600 mm
Dimensions	Frame 9; exact height and width configuration dependent
Weight (kg)	Approximately 1,250 kg class

This is suitable when the motor does not require the full 1,465 A capability.

51. Recommended Model 2 — 20G11BC1K0AN4NNNNN

The 20G11BC1K0AN4NNNNN provides another step in the PowerFlex 755 current range.

Parameter	Specification
Model	20G11BC1K0AN4NNNNN
Series	PowerFlex 755
Voltage	400 V AC class
Output current	Approximately 1,045 A
Normal Duty	Approximately 560 kW
Heavy Duty	Approximately 500 kW
Frame	Frame 9
Cooling	Air cooled
Enclosure	IP20 / Type 1 class
Cabinet	600 mm MCC style
EMC filter	Yes
Dynamic braking	None
Depth	600 mm
Dimensions	Frame 9; exact height and width configuration dependent
Weight (kg)	Approximately 1,250 kg class

This model is appropriate when the required motor current is lower than the target 1K4 configuration.

52. Recommended Model 3 — 20G11BC1K2AN4NNNNN

The 20G11BC1K2AN4NNNNN is a particularly useful lower-capacity alternative.

Parameter	Specification
Model	20G11BC1K2AN4NNNNN
Series	PowerFlex 755
Voltage	400 V AC class
Output current	1,175 A
Normal Duty	710 kW
Heavy Duty	560 kW
Frame	Frame 9
Cooling	Air cooled
Enclosure	IP20 / Type 1 class
Cabinet	600 mm MCC style
EMC filter	Yes
Dynamic braking	None
Depth	600 mm
Dimensions	Frame 9; exact height and width configuration dependent
Weight (kg)	Approximately 1,250 kg class

This model is useful when a plant wants to remain within the same PowerFlex 755 architecture while reducing current capacity.

53. Recommended Model 4 — 20G11BC1K4JN4NNNNN

The 20G11BC1K4JN4NNNNN is the most important alternative because it is identified as the direct replacement for the discontinued target model.

Parameter	Specification
Model	20G11BC1K4JN4NNNNN
Series	PowerFlex 755
Voltage	400 V AC class
Output current	Approximately 1,465 A
Light Duty	Approximately 850 kW class
Normal Duty	800 kW
Heavy Duty	630 kW
Frame	Frame 9
Cooling	Air cooled
Enclosure	IP20 / Type 1 class
Cabinet	600 mm MCC style
EMC filter	Yes
Dynamic braking	None
Depth	600 mm
Dimensions	Frame 9; exact height and width configuration dependent
Weight (kg)	Approximately 1,270 kg class
Status	Active replacement configuration

This should normally be the first model evaluated for a direct replacement project.

54. Recommended Model 5 — 20G11BC1K5JN4NNNNN

The 20G11BC1K5JN4NNNNN is a higher-capacity related configuration.

Parameter	Specification
Model	20G11BC1K5JN4NNNNN
Series	PowerFlex 755
Voltage	400 V AC class
Output current	Approximately 1,480 A
Normal Duty	Approximately 850 kW
Heavy Duty	Approximately 710 kW
Frame	Frame 9
Cooling	Air cooled
Enclosure	IP20 / Type 1 class
Cabinet	600 mm MCC style
EMC filter	Yes
Dynamic braking	None
Depth	600 mm
Dimensions	Frame 9; exact height and width configuration dependent
Weight (kg)	Configuration dependent

It is useful when the motor current requirement is slightly higher than the target 1K4 configuration.

55. Direct Replacement Model

The direct replacement deserves separate attention.

The original:

20G11BC1K4AN4NNNNN

is listed as discontinued, with:

20G11BC1K4JN4NNNNN

identified as the direct replacement.

Item	Original	Replacement
Model	20G11BC1K4AN4NNNNN	20G11BC1K4JN4NNNNN
Series	PowerFlex 755	PowerFlex 755
Voltage	400 V class	400 V class
Current	~1,465 A	~1,465 A
Normal Duty	~800 kW	~800 kW
Heavy Duty	~630 kW	~630 kW
Frame	9	9
Cooling	Air cooled	Air cooled
Cabinet depth	600 mm	600 mm
Product status	Discontinued	Replacement configuration
Replacement relationship	Original	Direct replacement

The manufacturer lists the discontinuation date as June 30, 2024.

56. Five Same-Brand Recommended Models

For broader comparison, the following models are useful same-brand alternatives covering different power levels and applications.

Model	Series	Voltage	Current	Normal Duty	Frame	Dimensions	Weight
20G11BC1K4JN4NNNNN	PowerFlex 755	400 V	~1,465 A	~800 kW	9	600 mm deep MCC style	~1,270 kg
20G11BC1K2JN4NNNNN	PowerFlex 755	400 V	1,175 A	710 kW	9	600 mm deep MCC style	~1,250 kg class
20G11BC1K5JN4NNNNN	PowerFlex 755	400 V	~1,480 A	~850 kW	9	600 mm deep MCC style	Configuration dependent
20F1ANC456JA0NNNNN	PowerFlex 753	400 V	456 A	250 kW	7	Frame 7 configuration	Configuration dependent
25B-D030N114	PowerFlex 525	380–480 V	30 A	15 kW	D	Compact frame	~18 kg class

These models should not be treated as electrically interchangeable.

The first three are close PowerFlex 755 alternatives, while the PowerFlex 753 and PowerFlex 525 represent significantly smaller drive classes.

57. Same-Brand Model — PowerFlex 753

The 20F1ANC456JA0NNNNN belongs to the PowerFlex 753 family.

It is considerably smaller than the target model but remains a useful industrial-drive option.

Parameter	Specification
Model	20F1ANC456JA0NNNNN
Series	PowerFlex 753
Voltage	400 V AC class
Output current	456 A
Normal Duty	250 kW
Heavy Duty	200 kW
Frame	Frame 7
Cooling	Forced air
Enclosure	Industrial IP20/IP00 class
EMC filter	Yes
Dynamic braking	Configuration dependent
Communication	Industrial Ethernet options available
Dimensions	Frame 7; configuration dependent
Weight (kg)	Configuration dependent

This is better suited to large but lower-power industrial motors.

58. Same-Brand Model — PowerFlex 525

The 25B-D030N114 belongs to the PowerFlex 525 family.

This is a compact drive and therefore represents a completely different application class.

Parameter	Specification
Model	25B-D030N114
Series	PowerFlex 525
Voltage	380–480 V AC
Input	Three phase
Output current	30 A
Normal Duty	15 kW
Heavy Duty	11 kW
Frame	D
Enclosure	IP20 / NEMA Open Type
Cooling	Forced air
Communication	Embedded EtherNet/IP
Safety	Safe Torque Off
Keypad	Integral keypad
Dimensions	Compact Frame D configuration
Weight (kg)	Approximately 18 kg class

This model is appropriate for compact industrial machines rather than the large motor applications associated with the 20G11BC1K4.

59. Current-Based Selection Guide

Model Class	Approx. Current	Typical Normal Duty	Application Scale
BC910	~910 A	~500 kW	Large industrial
BC1K0	~1,045 A	~560 kW	Large industrial
BC1K2	1,175 A	710 kW	Very large industrial
BC1K4	~1,465 A	800 kW	Very large industrial
BC1K5	~1,480 A	~850 kW	Very large industrial
BC2K1	~2,150 A class	~1,250 MW class	Extremely large industrial

The exact motor nameplate current should be used when making the final selection.

60. Motor Selection Considerations

A drive should not be selected solely by motor kW.

The following information should be reviewed:

Motor Parameter	Importance
Motor voltage	Must match drive voltage class
Motor current	Primary sizing parameter
Motor power	General capacity reference
Motor frequency	Required operating base
Motor speed	Determines speed range
Motor torque	Important for load selection
Starting torque	Important for demanding loads
Overload requirement	Determines duty class
Acceleration	Determines current demand
Deceleration	Determines braking requirement
Duty cycle	Determines thermal loading
Cable length	Affects EMC and motor stress
Motor insulation	Important for inverter operation

61. Why Current Is More Important Than kW

A motor’s kW rating provides useful information, but it does not tell the entire story.

Two motors with similar power ratings can have different current requirements because of differences in:

• Voltage.
• Efficiency.
• Power factor.
• Motor design.
• Duty.
• Operating conditions.

Therefore, the correct procedure is to compare the actual motor nameplate current with the drive’s current rating under the required duty condition.

62. Installation Environment

The drive is designed for an industrial electrical environment.

The installation should avoid uncontrolled exposure to:

• Water.
• Condensation.
• Excessive dust.
• Corrosive chemicals.
• Extreme temperatures.
• Excessive vibration.

The IP20 / Type 1 class arrangement should not be interpreted as a weatherproof outdoor enclosure.

63. Floor Loading

Because the drive is approximately in the 1.27-tonne class, floor loading deserves attention.

The project should verify:

• Cabinet support.
• Floor strength.
• Raised-floor capacity where applicable.
• Transportation route.
• Lifting access.
• Final installation location.

64. Transportation

Moving a Frame 9 high-power drive is a major logistics task.

Before delivery, the project should check:

• Door width.
• Door height.
• Corridor clearance.
• Elevator capacity.
• Forklift capacity.
• Crane capacity.
• Floor loading.
• Temporary storage location.
• Final positioning method.

65. Lifting and Installation

The equipment should only be lifted using suitable lifting points and procedures.

The approximate 1,270 kg mass means that ordinary workshop lifting equipment may not be sufficient.

The installation plan should be prepared before the equipment arrives at the plant.

66. Maintenance Philosophy

The best maintenance approach for a large drive is preventive rather than purely corrective.

The maintenance team should monitor:

• Fan condition.
• Temperature.
• Dust.
• Electrical connections.
• Grounding.
• Communication.
• Fault history.
• Motor condition.
• Cabinet condition.
• Parameter integrity.

67. Typical Fault Investigation

When a high-power drive trips, troubleshooting should normally begin with the basic operating conditions.

Check:

1. Incoming power.
2. Drive status.
3. Fault code.
4. Motor current.
5. Motor temperature.
6. Mechanical load.
7. Cooling airflow.
8. Network status.
9. Motor cables.
10. Grounding.

A large-drive fault should not automatically be assumed to be an internal drive failure.

68. Application Matching

Application	Recommended Approach
Large centrifugal pump	Excellent fit
Large cooling pump	Excellent fit
Large wastewater pump	Excellent fit
Large ventilation fan	Excellent fit
Large blower	Excellent fit
Conveyor	Good fit; evaluate torque
Mining machinery	Good fit; evaluate environment
Cement machinery	Good fit
High-inertia machine	Evaluate braking carefully
Rapid-stop machinery	Braking analysis required
Small machine	Oversized; use smaller drive
Outdoor installation	Requires appropriate enclosure/system design

69. Five Closest PowerFlex 755 Alternatives

Model	Current	Normal Duty	Heavy Duty	Frame	Depth	Approx. Weight
20G11BC910AN4NNNNN	~910 A	~500 kW	~400 kW	9	600 mm	~1,250 kg
20G11BC1K0AN4NNNNN	~1,045 A	~560 kW	~500 kW	9	600 mm	~1,250 kg
20G11BC1K2AN4NNNNN	1,175 A	710 kW	560 kW	9	600 mm	~1,250 kg
20G11BC1K4JN4NNNNN	~1,465 A	800 kW	630 kW	9	600 mm	~1,270 kg
20G11BC1K5JN4NNNNN	~1,480 A	~850 kW	~710 kW	9	600 mm	Configuration dependent

The first three provide lower-capacity alternatives, the JN4 1K4 model is the direct replacement, and the 1K5 model provides a higher-capacity alternative.

70. Five Broader Same-Brand Alternatives

Model	Series	Approx. Current	Approx. Power	Application Scale	Dimensions	Weight
20G11BC1K4JN4NNNNN	PowerFlex 755	1,465 A	800 kW ND	Very large	600 mm deep	~1,270 kg
20G11BC1K2JN4NNNNN	PowerFlex 755	1,175 A	710 kW ND	Very large	600 mm deep	~1,250 kg
20G11BC1K5JN4NNNNN	PowerFlex 755	~1,480 A	~850 kW ND	Very large	600 mm deep	Configuration dependent
20F1ANC456JA0NNNNN	PowerFlex 753	456 A	250 kW ND	Large	Frame 7	Configuration dependent
25B-D030N114	PowerFlex 525	30 A	15 kW ND	Compact	Frame D	~18 kg

71. Why the Direct Replacement Is Important

When dealing with discontinued industrial equipment, the closest replacement is normally preferable to changing to a completely different drive family.

The direct replacement retains the same basic PowerFlex 755 architecture and rating class.

This can reduce the amount of engineering work required for:

• Cabinet planning.
• Motor matching.
• PLC integration.
• HMI configuration.
• Spare-parts planning.
• Maintenance training.

72. Important Replacement Checks

Even when the replacement catalog number is listed as direct, the following should be checked before installation:

Check	Importance
Motor current	Critical
Motor voltage	Critical
Duty rating	Critical
Cabinet dimensions	Critical
Weight	Critical
Cable arrangement	High
EMC configuration	High
Grounding	High
Network configuration	High
Parameter compatibility	High
Firmware	High
Safety configuration	High
Mechanical installation	High

73. Product Strengths at a Glance

The 20G11BC1K4AN4NNNNN can be summarized by several major strengths.

First, it provides a very high current rating for large industrial motors.

Second, its 800 kW Normal Duty rating makes it suitable for large continuous industrial processes.

Third, the Frame 9 architecture provides a platform specifically intended for large drive applications.

Fourth, the air-cooled design is practical for properly engineered electrical rooms.

Fifth, the PowerFlex 755 architecture provides a strong foundation for industrial automation integration.

Sixth, the EMC-filtered configuration is useful in electrically complex industrial environments.

Seventh, the 600 mm MCC-style configuration is well suited to centralized electrical installations.

74. Limitations to Consider

No large industrial drive is suitable for every application.

The main limitations and considerations for this model include:

• Large physical size.
• High equipment weight.
• Significant heat generation.
• Need for proper ventilation.
• Significant installation cost.
• Heavy transportation requirements.
• Need for correct electrical protection.
• Need for proper motor selection.
• No built-in dynamic-braking transistor.
• Discontinued original catalog configuration.

These points do not make the drive unsuitable.

They simply mean that it should be treated as major industrial equipment and engineered accordingly.

75. Best Applications

The model is particularly attractive for applications involving:

Large Pumps

Large Fans

Large Blowers

Water Treatment

Cooling Systems

Mining

Cement

Material Handling

Large Conveyors

Industrial Process Equipment

These applications commonly benefit from variable-speed control and centralized motor management.

76. Applications Where Extra Evaluation Is Needed

Some applications require more detailed engineering.

These include:

• Very high-inertia loads.
• Frequent rapid stopping.
• Regenerative loads.
• Four-quadrant operation.
• Extremely short acceleration times.
• Extremely short deceleration times.
• Severe ambient conditions.
• High-altitude operation.
• Outdoor installations.
• Hazardous-area installations.

The drive’s basic power rating does not automatically guarantee suitability for these conditions.

77. Overall Technical Assessment

The 20G11BC1K4AN4NNNNN is a high-power industrial variable-frequency drive designed for large three-phase AC motors.

Its approximately 1,465 A output-current capability and 800 kW Normal Duty class make it suitable for some of the largest motor applications found in conventional low-voltage industrial systems.

The Frame 9 air-cooled architecture provides a practical platform for large pumps, fans, blowers, conveyors and process machinery.

Its EMC-filtered AC-input-with-precharge configuration is another important part of the overall design.

The PowerFlex 755 family also gives plant engineers a way to standardize drive architecture across multiple motor sizes.

This can simplify commissioning, troubleshooting, maintenance and operator training.

78. Final Technical Summary

Category	Specification
Model	20G11BC1K4AN4NNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Product type	PowerFlex Air Cooled 755 AC Drive
Sub-family	755 AC Packaged Drive
Input voltage	400 V AC class
Input phase	3 phase
Output current	Approximately 1,465 A
Light Duty	Approximately 850 kW class
Normal Duty	800 kW
Heavy Duty	630 kW
Frame	9
Cooling	Air cooled
Enclosure	IP20 / Type 1 class
Cabinet style	600 mm Deep MCC Style
Input	AC Input with Precharge
EMC filter	Yes
Dynamic braking	None
Operator configuration	AN4
Depth	600 mm class
Height	Configuration dependent
Width	Configuration dependent
Approximate weight (kg)	Approximately 1,270 kg class
Product status	Discontinued
Discontinued date	June 30, 2024
Direct replacement	20G11BC1K4JN4NNNNN

The exact catalog page confirms that 20G11BC1K4AN4NNNNN is a PowerFlex Air Cooled 755 AC Drive, identifies it as discontinued and specifies 20G11BC1K4JN4NNNNN as the direct replacement.

79. Final Conclusion

The 20G11BC1K4AN4NNNNN is a high-capacity industrial AC drive designed for large motor applications where high current, controlled speed and reliable industrial automation integration are required.

Its key characteristics are the 400 V AC class, approximately 1,465 A output current, approximately 850 kW Light Duty capability, 800 kW Normal Duty rating, 630 kW Heavy Duty rating, Frame 9 construction, air cooling, EMC filtering, AC input with precharge and 600 mm MCC-style depth.

It is particularly well suited to large pumps, fans, blowers, conveyors, water-treatment systems, cooling systems, mining equipment, cement plants and other high-power process machinery.

The approximate 1,270 kg equipment weight also means that installation planning should include transportation, lifting, floor loading, ventilation and maintenance access from the beginning of the project.

For a new project, the most important model to evaluate is the 20G11BC1K4JN4NNNNN, because it is identified as the direct replacement for the discontinued 20G11BC1K4AN4NNNNN.

For applications requiring less capacity, the 20G11BC1K2 and BC1K0 classes are useful alternatives.

For applications requiring more capacity, the BC1K5 class provides a higher-power option.

For substantially smaller motors, the PowerFlex 753 and PowerFlex 525 families offer more appropriately sized solutions.

Overall, the 20G11BC1K4AN4NNNNN should be viewed as a large industrial PowerFlex 755 drive for high-power motor control, rather than as a general-purpose compact VFD. Its greatest value is in large, continuously operating industrial processes where precise speed control, high current capability, centralized automation and robust plant-level integration are important.