# AutomationDirect GS4-27P5

Hardware · `GS4-27P5` · verification: source checked

The GS4-27P5 is a DURApulse GS4 series AC variable frequency drive in a NEMA 1 enclosure. It accepts 230 VAC input and provides 7-1/2 hp with 3-phase input or 3 hp with 1-phase input, using SVC or V/Hz control. It has RS-485 communication, integrated dynamic braking, and optional EtherNet/IP and Modbus TCP cards.

## Specification

| Property | Value |
|---|---|
| Category | vfd |
| Weight | 5.624545388 kg |
| Supply voltage | 230 VAC |
| Frame size | B |
| Output type | PWM output |
| IP rating | IP20 |
| Operating temp min | -10 °C |
| Operating temp max | 50 °C |

## Connected

- Manufacturer: [AutomationDirect](https://machineschema.com/manufacturer/automationdirect.md)
- Protocols: [MODBUS ASCII](https://machineschema.com/protocol/modbus-ascii.md), [MODBUS RTU](https://machineschema.com/protocol/modbus-rtu.md)

## Safety

- Built-in Safe Torque Off (STO) function.
- A user-supplied external fuse is required.
- UL Listed File # E198015.
- CE and RoHS compliance are stated; CSA file # is None.

## Study notes

- GS4 series; controller type is high-performance.
- Input phases: 3 and 1; output phases: 3.
- Horsepower by input phase: 7-1/2 hp with 3-phase input, 3 hp with 1-phase input.
- Amperage rating: 24 A with 3-phase input and 11 A with 1-phase input; variable torque rating 25 A.
- Control mode: SVC or V/Hz.
- RS-485 (RJ12) port supports Modbus RTU, Modbus ASCII, and BACnet at up to 115.2k baud.
- Optional EtherNet/IP and Modbus TCP cards are available.
- Carrier frequency range 2-15 kHz; output frequency range 0.1-599 Hz.
- Analog I/O: 3 inputs and 2 outputs; discrete I/O: 8 inputs and 4 outputs.
- Programming language: ladder; connector type: screw terminals.
- For use with 3-phase induction motors.
- Integrated dynamic braking and built-in reverse capability.

## Sources

1. [DURApulse AC High-performance Drive: 230 VAC, 7-1/2hp with 3-phase input, 3hp with 1-phase input, (VFD) (PN# GS4-27P5) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/high-performance_vfds/gs4-27p5) (accessed 2026-10-26)
2. [GS4 27P5 cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/GS4-27P5_cutsheet.pdf) (accessed 2026-10-26)

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