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Allen-Bradley 20G1G3D361LNDNNNNN PowerFlex 755 AC Drive

1. Product Overview

The Allen-Bradley 20G1G3D361LNDNNNNN is a high-power air-cooled AC variable frequency drive belonging to the PowerFlex 755 family. It is designed for demanding industrial motor-control applications where a combination of high output current, adjustable motor speed, controlled acceleration and deceleration, and integration with an industrial automation system is required.

The model is configured for the 480 VAC, three-phase class and has a 361 A normal-duty output rating. At the normal-duty rating, it corresponds to approximately 300 HP, or roughly 224 kW, making it suitable for large industrial motors.

The same 361 A drive class can also be considered in relation to different duty requirements. For applications requiring heavier overload capability, the available horsepower rating is lower. In other words, the motor should not be selected from horsepower alone. Motor nameplate current, overload requirements, torque characteristics, acceleration requirements, and operating conditions should all be considered.

The drive uses a forced-air cooling system and a floor-mounted industrial enclosure configuration. Its physical size and weight are considerably greater than those of compact variable frequency drives, reflecting the high electrical power handled by the unit.

For large pumps, fans, conveyors, compressors, mixers, processing equipment, and material-handling machinery, this type of drive provides a practical way to control motor speed and torque while allowing the motor to operate as part of a larger automated process.

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2. Basic Product Information

Parameter	Specification
Brand	Allen-Bradley
Product Family	PowerFlex 755
Product Series	PowerFlex 750-Series
Product Type	High-power air-cooled AC packaged drive
Exact Model	20G1G3D361LNDNNNNN
Drive Type	Variable Frequency Drive / Adjustable Frequency Drive
Input Voltage Class	480 VAC
Input Phase	Three-phase
Nominal Input Frequency	60 Hz
Normal-Duty Continuous Output Current	361 A
Normal-Duty Motor Rating	Approximately 300 HP
Approximate Normal-Duty Power	Approximately 224 kW
Heavy-Duty Motor Rating	Approximately 250 HP
Heavy-Duty Current Class	Approximately 302 A
Frame	Frame 7
Cooling Method	Forced air
Mounting	Floor-mounted industrial cabinet
Enclosure Class	IP21 / UL Type 1 class
Input Configuration	AC input with precharge
Motor Control	Programmable AC motor control
Control Platform	PowerFlex 755 / TotalFORCE architecture
Typical Application	Large industrial machinery
Approximate Dimensions	Approx. 2453 × 600 × 800 mm
Approximate Weight	Approx. 623 kg

The dimensions and weight are engineering reference values for the applicable large-frame packaged configuration. Actual shipping dimensions and installed weight can vary depending on factory options, cabinet configuration, disconnect equipment, filters, reactors, control accessories, and other installed components.

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3. Brand and Series

Brand

Allen-Bradley

Product Series

PowerFlex 755

Product Family

PowerFlex 750-Series

The PowerFlex 755 is positioned toward larger and more demanding industrial motor applications. Compared with compact drives, it provides a much higher level of current capacity and configuration flexibility.

The 20G1G3D361LNDNNNNN belongs to the 480 VAC portion of this family and uses the D361 rating code.

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4. Model Number Explanation

The complete catalog number is:

20G1G3D361LNDNNNNN

The individual sections of the catalog number identify different aspects of the drive configuration.

Catalog Section	Meaning	Description
20G	Product family	PowerFlex 755 family
1	Product configuration	Applicable drive configuration identifier
G	Drive/input configuration	Industrial AC drive configuration
3	Enclosure	IP21 / UL Type 1, floor-mounted configuration
D	Input voltage	480 VAC, three-phase
361	Rating	361 A normal-duty rating
L	Filtering configuration	No EMC filtering in this catalog configuration
N	Option position	Factory configuration position
D	Option/control position	Factory configuration identifier
NNNNN	Additional configuration positions	Additional factory configuration positions

The complete catalog number should be used when identifying the product for replacement purposes.

The D361 portion is especially important because it identifies the 480 VAC, 361 A rating class.

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5. Detailed Electrical Parameters

The 361 A rating is one of the most important technical characteristics of this model.

At the normal-duty rating, the drive is associated with approximately 300 HP at 480 VAC. For applications requiring heavier overload performance, the corresponding heavy-duty motor rating is approximately 250 HP.

Electrical Parameter	Specification
Model	20G1G3D361LNDNNNNN
Input Voltage	480 VAC class
Input Phase	Three-phase
Input Frequency	60 Hz nominal
Normal-Duty Continuous Output Current	361 A
Normal-Duty Motor Rating	300 HP
Approx. Normal-Duty Power	224 kW
Heavy-Duty Continuous Output Current	Approx. 302 A
Heavy-Duty Motor Rating	250 HP
Approx. Heavy-Duty Power	186 kW
Output Voltage	Variable, up to motor-rated voltage
Output Frequency	Programmable according to application
Motor Control	Variable-frequency AC motor control
Control Modes	V/Hz and vector-oriented control capabilities
Input Precharge	Yes
DC Bus	Integrated
Dynamic Braking	Configuration dependent
Regeneration	Application-specific
Motor Feedback	Available through compatible feedback options
Communication	Available through compatible communication options
I/O Expansion	Available through compatible option modules
Electronic Overload Protection	Available
Current Limiting	Programmable
Acceleration Time	Programmable
Deceleration Time	Programmable
Speed Reference	Programmable
Fault Monitoring	Integrated
Motor Protection	Integrated functions available
Application Control	Programmable

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6. Normal-Duty and Heavy-Duty Rating

One important point when working with this model is the distinction between normal-duty and heavy-duty operation.

For the 480 VAC D361 rating, the drive is associated with approximately:

• 300 HP / 361 A — Normal Duty

and approximately:

• 250 HP / 302 A — Heavy Duty

This distinction is important for applications with different torque and overload characteristics.

A centrifugal fan or pump may have a different load profile from a conveyor, crusher, mixer, hoist, or extruder.

For this reason, the 300 HP figure should not automatically be interpreted as the maximum motor size for every application.

The correct selection should be based on the motor’s actual full-load current and the required overload profile.

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7. Product Introduction

The 20G1G3D361LNDNNNNN is designed for industrial facilities where large electric motors need variable-speed operation.

Instead of allowing a motor to operate only at a fixed frequency, the drive controls the electrical frequency and voltage supplied to the motor. This allows the motor speed to be adjusted according to the process requirement.

For a large 300 HP-class motor, this type of control can be particularly useful because starting and stopping a large motor can produce significant mechanical and electrical stress.

The drive can provide controlled acceleration, controlled deceleration, adjustable speed references, current limitation, motor protection, fault monitoring, and communication with a larger control system.

Its high current capacity also makes it appropriate for equipment that cannot be served by compact general-purpose drives.

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8. Main Applications

8.1 Large Conveyor Systems

Large conveyor systems are a natural application for this drive class.

Bulk-material conveyors, mining conveyors, aggregate conveyors, production conveyors, and large transfer systems can require substantial motor power.

The drive can gradually accelerate the motor rather than applying full electrical power instantaneously.

This can help reduce mechanical shock to belts, gearboxes, couplings, shafts, and other drivetrain components.

Variable-speed control can also allow conveyor speed to be adjusted to match the production process.

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8.2 Industrial Pumps

Large pumps can use variable-speed operation to match flow and pressure requirements.

Typical applications include:

• Water transfer
• Cooling-water circulation
• Industrial process pumping
• Wastewater handling
• Large circulation systems
• Boiler-related pumping systems
• Process-fluid systems

A properly designed variable-speed pump system can reduce the need for continuous full-speed operation.

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8.3 Large Fans and Blowers

Large industrial fans and blowers often require significant motor power.

The drive can adjust the motor speed according to airflow demand.

Typical applications include:

• Industrial ventilation
• Process exhaust
• Furnace airflow
• Combustion-air systems
• Cooling systems
• Large air-handling equipment

Variable-speed control can also provide smoother startup than direct-on-line starting.

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8.4 Compressors

Large compressors can require controlled acceleration because compressor loads can place substantial demands on the motor during startup.

The drive can be incorporated into suitable compressor applications when the compressor and motor are approved for variable-frequency operation.

The specific compressor torque curve and process requirements should always be considered.

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8.5 Mixers and Agitators

Large mixers may require controlled torque at low and medium speeds.

The PowerFlex 755 platform can be configured for applications where motor speed and torque need to be controlled according to the process.

This can be useful in chemical processing, material preparation, industrial mixing, and other process equipment.

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8.6 Material Handling Equipment

Large material-handling equipment can benefit from programmable acceleration and deceleration.

Potential applications include:

• Bulk-material systems
• Feeders
• Transfer machinery
• Large conveyors
• Processing lines
• Lifting-related equipment

For hoisting applications, braking and feedback requirements must be carefully engineered.

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8.7 Industrial Processing Machines

The drive can also be used for:

• Mills
• Rollers
• Extrusion machinery
• Process machinery
• Large rotating equipment
• Industrial production machines
• High-power mechanical systems

The ability to adjust motor speed provides greater flexibility when the process requires different operating speeds.

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9. Main Product Advantages

9.1 High Current Capacity

The 361 A normal-duty output rating is one of the most important advantages of this model.

It places the drive well above compact machine-level variable frequency drives.

This makes it appropriate for large motors and large mechanical systems.

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9.2 Large Motor Compatibility

At approximately 300 HP normal duty, this model can control substantially larger motors than small and medium-size inverter products.

This makes it useful for heavy industrial machinery.

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9.3 Controlled Starting

Large motors can create significant electrical and mechanical stress during startup.

A variable-frequency drive can control the acceleration process and gradually increase motor speed.

This can reduce mechanical shock and provide smoother machine operation.

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9.4 Adjustable Speed

The drive allows motor speed to be adjusted according to production requirements.

This can be useful for applications where process demand changes throughout the operating cycle.

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9.5 Programmable Acceleration and Deceleration

Acceleration and deceleration parameters can be programmed to match the characteristics of the connected equipment.

A high-inertia machine may require a different acceleration profile from a relatively light mechanical load.

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9.6 Flexible Motor Control

The PowerFlex 755 platform supports multiple motor-control strategies.

This gives engineers more flexibility when configuring the drive for different motor and machine characteristics.

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9.7 Automation System Integration

The drive can operate as part of a larger industrial control system.

Operating commands, speed references, status information, alarms, and drive data can be exchanged through compatible communication and I/O configurations.

This is particularly useful in large plants where drives are supervised by a centralized automation system.

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9.8 Expandable Configuration

The PowerFlex 755 architecture supports additional options for communication, feedback, I/O, and other application requirements.

This allows the drive to be adapted to the machine instead of forcing every application into the same fixed configuration.

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9.9 Industrial Cabinet Construction

The floor-mounted cabinet arrangement is appropriate for large industrial installations.

Unlike compact wall-mounted drives, the cabinet configuration provides a practical structure for handling high-current power electronics and associated cooling requirements.

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10. Dimensions and Weight

Because the model is a large industrial drive, mechanical installation should be planned before ordering.

A representative cabinet configuration is approximately:

2453 mm high × 600 mm wide × 800 mm deep

with an approximate weight of:

623 kg

Mechanical Parameter	Specification
Model	20G1G3D361LNDNNNNN
Frame	Frame 7
Mounting	Floor mount
Enclosure	IP21 / UL Type 1
Height	Approx. 2453 mm
Width	Approx. 600 mm
Depth	Approx. 800 mm
Approx. Overall Dimensions	Approx. 2453 × 600 × 800 mm
Approx. Weight	623 kg
Weight Unit	kg
Cooling	Forced air
Installation Orientation	Upright
Cabinet Construction	Industrial floor-mounted cabinet
Service Access	Front/service access required
Lifting	Mechanical lifting equipment normally required

The exact dimensions and weight should be confirmed against the dimensional drawing for the particular factory configuration before transportation or installation.

Accessories and additional equipment can change the final shipping weight and envelope.

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11. Installation Environment

Large industrial drives require an appropriate installation environment.

Temperature is particularly important because the power electronics generate heat during operation.

The installation area should provide sufficient ventilation and should not obstruct the cooling airflow.

The following conditions should be considered:

• Ambient temperature
• Altitude
• Humidity
• Dust
• Corrosive gases
• Vibration
• Cooling airflow
• Cabinet clearance
• Service access
• Electrical grounding
• Incoming power quality
• Motor cable arrangement

A drive of this size should be installed by personnel familiar with high-power industrial electrical equipment.

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12. Maintenance

The forced-air cooling system should be maintained properly throughout the operating life of the equipment.

Cooling fans, air passages, cabinet ventilation, power connections, control wiring, and other components should be inspected according to the maintenance plan.

Dust accumulation can reduce cooling performance and increase the thermal stress on power components.

Routine inspection should include:

Maintenance Item	Recommended Attention
Cooling fans	Check operation and abnormal noise
Air passages	Keep clear
Cabinet ventilation	Check airflow
Power terminals	Inspect for loose or overheated connections
Grounding	Verify integrity
Control wiring	Inspect connections
Motor cables	Inspect insulation and terminations
DC bus components	Inspect according to maintenance procedure
Filters	Clean or replace where applicable
Cabinet interior	Keep free of excessive dust
Fault history	Review recurring faults
Ambient temperature	Monitor operating conditions

Maintenance intervals should be determined according to the actual operating environment and plant maintenance requirements.

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13. Recommended Same-Series / Related Models

The following models are useful for comparison with the 361 A version. They represent nearby rating classes within the same high-power family.

Model	Voltage	Normal-Duty Current	Normal-Duty HP	Heavy-Duty HP	Frame	Cooling	Approx. Dimensions	Approx. Weight
20G1G3D302LNDNNNNN	480 VAC, 3-phase	302 A	250 HP	200 HP	7	Forced air	Approx. 2453 × 600 × 800 mm	Approx. 623 kg
20G1G3D361LNDNNNNN	480 VAC, 3-phase	361 A	300 HP	250 HP	7	Forced air	Approx. 2453 × 600 × 800 mm	Approx. 623 kg
20G1G3D430LNDNNNNN	480 VAC, 3-phase	430 A	350 HP	300 HP	7	Forced air	Approx. Frame 7 cabinet	Approx. 623 kg class
20G1G3D505LNDNNNNN	480 VAC, 3-phase	505 A	400 HP	350 HP	7	Forced air	Approx. Frame 7 cabinet	Approx. 623 kg class
20G1G3D617LNDNNNNN	480 VAC, 3-phase	617 A	500 HP	400 HP	7	Forced air	Approx. Frame 7 cabinet	Approx. 623 kg class

These models form a practical comparison range around the D361 model.

The D302 is appropriate where a lower current rating is sufficient, while the D430, D505, and D617 provide progressively greater capacity for larger motors.

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14. Larger Related Models

For applications requiring substantially more power, the PowerFlex 755 family extends into larger frames.

Model	Voltage	Normal-Duty Current Class	Approx. Normal-Duty HP	Heavy-Duty HP	Frame	Cooling	Approx. Weight Class
20G1G3D710LNDNNNNN	480 VAC, 3-phase	710 A class	600 HP	450 HP	8	Forced air	Large cabinet
20G1G3D740LNDNNNNN	480 VAC, 3-phase	740 A class	650 HP	500 HP	8	Forced air	Large cabinet
20G1G3D800LNDNNNNN	480 VAC, 3-phase	800 A class	700 HP	600 HP	9	Forced air	Approx. 1,000 kg class
20G1G3D960LNDNNNNN	480 VAC, 3-phase	960 A class	800 HP	700 HP	9	Forced air	Approx. 1,000 kg class
20G1G3D1K0LNDNNNNN	480 VAC, 3-phase	1045 A class	900 HP	750 HP	9	Forced air	Approx. 1,000 kg class

These models are useful when a machine requires considerably more motor power than the D361 rating.

The actual frame, dimensions, weight, and duty capability should be verified against the complete catalog number and final configuration.

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15. Five Representative Same-Brand Models

The following five models represent commonly encountered products from the same brand’s PowerFlex range.

They are included as practical comparison products rather than as a formal ranking of market popularity.

Model	Product Series	Voltage Class	Approx. Current	Approx. Motor Rating	Typical Application	Approx. Dimensions	Approx. Weight
25B-D010N114	PowerFlex 525	480 VAC class	10 A	Approx. 4–5.5 kW	Small machines / pumps / fans	Approx. 180 × 100 × 200 mm	Approx. 2–3 kg
25B-D017N114	PowerFlex 525	480 VAC class	17 A	Approx. 7.5–11 kW	General industrial machinery	Approx. 180 × 100 × 200 mm	Approx. 3 kg
25B-D024N114	PowerFlex 525	480 VAC class	24 A	Approx. 11–15 kW	Pumps / conveyors / fans	Approx. 180 × 100 × 200 mm	Approx. 3–4 kg
25A-D017N114	PowerFlex 523	480 VAC class	17 A	Approx. 7.5–11 kW	Compact machine control	Approx. 180 × 100 × 200 mm	Approx. 2–3 kg
20F1ANC030JA0NNNNN	PowerFlex 753	480 VAC class	Approx. 30 A class	Approx. 15–22 kW class	Advanced industrial machinery	Approx. 300 × 200 × 250 mm class	Approx. 15–20 kg

Compared with the 20G1G3D361LNDNNNNN, all of these products are physically much smaller and have substantially lower current capacity.

The compact models are generally more appropriate for smaller machines, while the PowerFlex 753 and PowerFlex 755 families are intended for larger and more demanding industrial applications.

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16. Comparison With Compact Drives

The difference between the 20G1G3D361LNDNNNNN and compact drive products is substantial.

The D361 model is intended for a large 300 HP-class motor.

A compact 10 A or 17 A drive, by comparison, is designed for a much smaller motor.

This difference affects much more than the output current.

Large-drive installations typically require:

• Larger electrical cabinets
• Larger incoming power connections
• Larger motor cables
• More substantial grounding
• Larger cooling capacity
• Mechanical lifting equipment
• Greater service clearance
• More detailed commissioning procedures

The physical size of the drive therefore reflects the scale of the application.

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17. Advantages for Industrial Automation

The drive is particularly useful in systems where motor operation needs to be coordinated with other equipment.

For example, a large conveyor can receive a speed reference from the main control system.

A pump can change speed according to a pressure or flow setpoint.

A fan can change speed according to temperature or airflow requirements.

A process mixer can operate at different speeds during different production stages.

The drive therefore becomes part of the overall control architecture rather than functioning simply as a motor starter.

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18. Energy and Process Control Benefits

Variable-speed operation can provide process advantages in applications where the required motor speed changes over time.

This is especially relevant to centrifugal pumps and fans.

Rather than continuously running a motor at full speed and using a mechanical restriction to reduce process output, the drive can reduce motor speed when the process requires less flow or airflow.

The actual energy savings depend on the load profile, motor efficiency, process design, operating hours, and control strategy.

Therefore, energy savings should be calculated for the specific machine rather than assumed solely from installing a variable frequency drive.

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19. Selection Considerations

Before selecting this model for a new application, the following information should be checked.

Selection Parameter	What Should Be Checked
Motor voltage	Confirm compatibility with 480 VAC class system
Motor current	Compare motor nameplate current with drive rating
Motor horsepower	Confirm approximately 300 HP ND or 250 HP HD requirement
Motor frequency	Confirm 50/60 Hz requirements
Load type	Fan, pump, conveyor, mixer, compressor, etc.
Torque requirement	Constant torque or variable torque
Overload requirement	Determine normal-duty or heavy-duty operation
Starting requirement	Determine acceleration and starting torque
Braking	Determine whether dynamic braking is required
Regeneration	Determine whether regenerative operation is required
Feedback	Determine whether encoder/feedback is needed
Communication	Determine required industrial network
Environment	Temperature, altitude, dust, humidity
Cabinet	Confirm enclosure and installation requirements
Harmonics	Evaluate system harmonic requirements
Motor cable	Confirm cable size and installation method
Service space	Provide sufficient maintenance clearance
Weight	Plan transportation and lifting for approximately 623 kg class

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20. Product Application Summary

Application	Suitability	Typical Reason
Large conveyors	High	High current and adjustable speed
Industrial pumps	High	Variable flow and pressure control
Large fans	High	Adjustable airflow
Industrial blowers	High	Large motor speed control
Compressors	High with engineering review	Controlled acceleration and process control
Mixers	High	Adjustable speed and torque
Material handling	High	Controlled movement
Mills	Application dependent	High-power motor operation
Rollers	High	Speed regulation
Crushers	Application dependent	High torque and overload
Hoists	Application dependent	Requires detailed braking/feedback design
Small machines	Usually oversized	Excessive power capacity

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21. Product Strengths at a Glance

Feature	Benefit
361 A normal-duty rating	Supports large industrial motors
Approx. 300 HP ND class	Suitable for high-power machinery
480 VAC three-phase	Compatible with common industrial power systems
Forced-air cooling	Suitable for large power electronics
Floor-mounted cabinet	Practical for high-power installations
Programmable speed	Allows process-based motor control
Programmable acceleration	Helps manage large mechanical loads
Programmable deceleration	Provides controlled stopping
Vector-oriented control capability	Supports demanding motor-control applications
Expandable architecture	Allows application-specific options
Communication capability	Integrates with automation systems
Feedback options	Supports applications requiring enhanced speed control
Motor protection functions	Helps monitor and protect the motor system
High-power architecture	Suitable for large industrial machinery

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22. Overall Product Summary

The Allen-Bradley 20G1G3D361LNDNNNNN is a high-power PowerFlex 755 variable frequency drive designed for large industrial motor applications.

Its principal electrical rating is 361 A at 480 VAC, three-phase, corresponding to approximately 300 HP / 224 kW under normal-duty conditions.

For heavy-duty applications requiring greater overload capability, the corresponding motor class is approximately 250 HP / 186 kW.

The drive uses a forced-air cooling system and a floor-mounted industrial cabinet configuration.

A representative mechanical envelope is approximately 2453 × 600 × 800 mm, with an approximate weight of 623 kg.

Because of its size and power level, it is intended for industrial applications rather than compact machinery.

Typical applications include large conveyors, industrial pumps, fans, blowers, compressors, mixers, material-handling systems, mills, rollers, and other large rotating machines.

One of the strongest characteristics of this model is the combination of high current capability and flexible motor-control functionality.

The drive can provide adjustable speed, controlled acceleration, controlled deceleration, current limitation, motor protection, fault monitoring, and integration with a larger automation system.

When selecting this model, the motor nameplate current should be given priority over horsepower alone. The application duty, overload requirement, torque profile, braking requirements, environmental conditions, motor feedback requirements, and communication architecture should also be reviewed.

The neighboring D302, D430, D505, and D617 models provide useful alternatives when the required motor current is respectively lower or higher than the D361 rating.

For substantially larger motors, the D710, D740, D800, D960, and D1K0 classes provide a path into larger PowerFlex 755 installations.

Overall, the 20G1G3D361LNDNNNNN can be regarded as a large-frame, 480 VAC, 361 A PowerFlex 755 AC drive for approximately 300 HP normal-duty industrial motor applications, with the physical construction and control flexibility expected from a high-power industrial variable-frequency drive.