# AutomationDirect GS4-4075

Hardware · `GS4-4075` · verification: source checked

The GS4-4075 is a DURApulse GS4 series AC variable frequency drive in an open frame. It takes 460 VAC three-phase input and is rated 75 hp with three-phase input, driving three-phase induction motors in SVC or V/Hz control mode. It has an RS-485 port for Modbus RTU, Modbus ASCII and BACnet, and accepts optional EtherNet/IP and Modbus TCP cards.

## Specification

| Property | Value |
|---|---|
| Category | vfd |
| Supply voltage | 460 VAC |
| Frame size | D |
| Output type | PWM output |
| 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

- Safe Torque Off (STO) is built-in.
- An external dynamic braking unit is required.
- A user-supplied external fuse is required.
- Open frame enclosure; the document lists IP00 and IP20 ratings.
- Operating temperature range is -10 to +50 °C.
- Certifications stated: UL Listed File # E198015, CE declaration and RoHS compliant.

## Study notes

- GS4 series, frame size D, open frame, panel or wall mounting.
- Three-phase 460 VAC input and three-phase output; 75 hp with 3-phase input.
- Current ratings: 105 A amperage rating and 100 A variable torque rating.
- Control modes: 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; these are not built-in.
- A keypad (GS4-KPD) is included and attached to the drive.
- Discrete I/O: 8 inputs at 24 VDC and 4 outputs; outputs include Form C (SPDT) relays plus sinking/sourcing.
- Analog I/O: 3 input channels and 2 output channels.
- Programming language is ladder; GSLOGIC drive PLC software is listed.
- No integrated EMI filter; reverse capability is built-in.
- External dynamic braking unit is required.

## Sources

1. [DURApulse AC High-performance Drive: 460 VAC, 75hp with 3-phase input, (VFD) (PN# GS4-4075) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/high-performance_vfds/gs4-4075) (accessed 2026-10-26)
2. [GS4 4075 cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/GS4-4075_cutsheet.pdf) (accessed 2026-10-26)

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