# AutomationDirect DURApulse GS4-2050

Hardware · `GS4-2050` · verification: source checked

The DURApulse GS4-2050 is an open-frame AC variable frequency drive in the GS4 series. It accepts 230 VAC input, either 3-phase or 1-phase, and produces 3-phase output, rated 50 hp on 3-phase input and 10 hp on 1-phase input. Control is sensorless vector (SVC) or V/Hz, and the drive communicates over an RS-485 (RJ12) port using Modbus RTU, Modbus ASCII or BACnet.

## Specification

| Property | Value |
|---|---|
| Category | vfd |
| Weight | 53.9775 kg |
| Supply voltage | 230 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.
- UL Listed, File # E198015; no UL Recognized file and no UL Hazardous file.
- No CSA file number is listed.
- CE declaration available and RoHS status compliant (see CE document); EU REACH document available.

## Study notes

- Amperage rating 139 A with 3-phase input and 33 A with 1-phase input; variable torque amperage rating 9 A.
- Control modes are SVC or V/Hz; output type is PWM.
- Output frequency range 0.1-599 Hz; carrier frequency range 2-15 kHz.
- Discrete I/O: 8 inputs at 24 VDC (sinking/sourcing), 4 outputs rated 240 VAC and 48 VDC (relay/sinking/sourcing) with two Form C (SPDT) relays, 3 A/point relay and 50 mA/point discrete.
- Analog I/O: 3 input channels (0-20 mA and 4-20 mA, +/-10 VDC, 11-bit resolution) and 2 output channels (0-20 mA and 4-20 mA, 0-10 VDC, 10-bit resolution).
- Input signal options are 4-20 mA, voltage or potentiometer input.
- Single RS-485 (RJ12) communication port with speeds up to 115.2k baud; optional EtherNet/IP and Modbus TCP cards available.
- Open frame construction, panel or wall mounting; enclosure is rated both IP00 and IP20.
- No integrated EMI filter and not internally bypassed; an external dynamic braking unit is required.
- Built-in reverse capability; programming language is ladder; screw terminal connectors.
- A user-supplied external fuse is required.
- Intended for use with 3-phase induction motors.

## Sources

1. [DURApulse AC High-performance Drive: 230 VAC, 50hp with 3-phase input, 10hp with 1-phase input, (VFD) (PN# GS4-2050) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/high-performance_vfds/gs4-2050) (accessed 2026-10-26)
2. [GS4 2050 cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/GS4-2050_cutsheet.pdf) (accessed 2026-10-26)

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