# AutomationDirect GS4-4050

Hardware · `GS4-4050` · verification: source checked

The GS4-4050 is a DURApulse GS4 series AC variable frequency drive for 3-phase induction motors. It operates at 460 VAC nominal with 3-phase input, a 50 hp rating, and SVC or V/Hz control. It has a NEMA 1 enclosure, RS-485 communications, and built-in Safe Torque Off (STO).

## Specification

| Property | Value |
|---|---|
| Category | vfd |
| Supply voltage | 460 VAC |
| Rated power | 37.28499357911351 kW |
| Rated current | 69 A |
| Frame size | D0 |
| 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).
- A user-supplied external fuse is required.
- UL Listed File # E198015.
- CE marked; RoHS compliant.

## Study notes

- Controller type is high-performance; series GS4; control mode is SVC or V/Hz.
- Nominal input and output voltage is 460 VAC; input and output phases are 3.
- Amperage rating is 69 A, with a 73 A variable torque rating; horsepower is 50 hp with 3-phase input.
- RS-485 (RJ12) port supports Modbus RTU, Modbus ASCII and BACnet at up to 115.2 kbaud.
- Optional EtherNet/IP and Modbus TCP cards are available.
- Eight discrete inputs are 24 VDC sinking/sourcing; four discrete outputs are relay/sinking/sourcing.
- Analog input resolution is 11-bit and analog output resolution is 10-bit; input signal ranges include 0–20 mA, 4–20 mA and ±10 VDC.
- Output frequency range is 0.1–599 Hz; carrier frequency range is 2–15 kHz.
- Programming language is ladder; connectors are screw terminals; reverse capability is built-in.
- External dynamic braking unit required; integrated EMI filter is not included; internally bypassed is no.
- For use with 3-phase induction motors.

## Sources

1. [DURApulse AC High-performance Drive: 460 VAC, 50hp with 3-phase input, (VFD) (PN# GS4-4050) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/high-performance_vfds/gs4-4050) (accessed 2026-10-26)
2. [GS4 4050 cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/GS4-4050_cutsheet.pdf) (accessed 2026-10-26)

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