# AutomationDirect DURApulse GS4-4125

Hardware · `GS4-4125` · verification: source checked

The GS4-4125 is an open-frame AC variable frequency drive in the AutomationDirect DURApulse GS4 series. It takes a 460 VAC three-phase input and is rated 125 hp with three-phase input, driving three-phase induction motors in either sensorless vector control (SVC) or V/Hz mode. It provides an RS-485 (RJ12) port, analog and discrete I/O, and requires an external dynamic braking unit.

## Specification

| Property | Value |
|---|---|
| Category | vfd |
| Supply voltage | 460 VAC |
| Frame size | E |
| 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.
- UL Listed file # E198015; UL Recognized and UL Hazardous file numbers listed as none; CE and RoHS compliant.
- Operating temperature rating -10 to +50 deg C.
- A user-supplied external fuse is required.

## Study notes

- Open frame enclosure, panel or wall mounting, frame size E.
- Enclosure rating is IP00 and IP20.
- Control mode SVC or V/Hz; carrier frequency range 2-15 kHz; output frequency range 0.1-599 Hz.
- Rated 460 VAC input and output, 3 input phases and 3 output phases, 125 hp with 3-phase input.
- Amperage rating 171 A; variable torque amperage rating 180 A.
- 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; an external dynamic braking unit is required.
- Discrete I/O: 8 sinking/sourcing inputs at 24 VDC, 4 outputs (240 VAC and 48 VDC, relay/sinking/sourcing) with 2 Form C (SPDT) relays.
- Analog I/O: 3 current/voltage inputs (11-bit, 0-20 mA and 4-20 mA, +/-10 VDC) and 2 current/voltage outputs (10-bit, 0-20 mA and 4-20 mA, 0-10 VDC).
- Programming language is ladder; connectors are screw terminals; no integrated EMI filter and not internally bypassed.
- Item shipping weight is 160 lb; country of origin Taiwan.

## Sources

1. [DURApulse AC High-performance Drive: 460 VAC, 125hp with 3-phase input, (VFD) (PN# GS4-4125) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/high-performance_vfds/gs4-4125) (accessed 2026-10-26)
2. [GS4 4125 cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/GS4-4125_cutsheet.pdf) (accessed 2026-10-26)

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