# AutomationDirect DURApulse GS4-4020

Hardware · `GS4-4020` · verification: source checked

The GS4-4020 is a DURApulse GS4 series AC variable frequency drive rated for 20 hp on a 460 VAC three-phase input. It runs three-phase induction motors in either sensorless vector (SVC) or V/Hz mode, with an output frequency range of 0.1 to 599 Hz and integrated dynamic braking. It provides 8 discrete inputs, 4 discrete outputs and analog I/O, plus an RS-485 port using Modbus RTU, Modbus ASCII or BACnet.

## Specification

| Property | Value |
|---|---|
| Category | vfd |
| Supply voltage | 460 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

- Safe Torque Off (STO) is built-in.
- IP20 rating with NEMA 1 enclosure.
- Operating temperature rating -10 to +50 degrees C.
- UL Listed File # E198015; RoHS status yes (see CE declaration); no CSA file listed.
- A user-supplied external fuse is required.

## Study notes

- Series GS4, high-performance controller type; enclosure NEMA 1, panel or wall mounting, frame size B.
- Rated 20 hp with 3-phase input; amperage rating 30 A, variable torque rating 32 A; 460 VAC nominal input and output.
- Control mode is SVC or V/Hz; carrier frequency 2-15 kHz; output frequency range 0.1-599 Hz.
- Digital I/O: 8 discrete inputs at 24 VDC (sinking/sourcing) and 4 discrete outputs rated 240 VAC and 48 VDC (relay/sinking/sourcing), with 2 Form C (SPDT) relays.
- Analog I/O: 3 input channels (current/voltage, 11-bit, 0-20 mA and 4-20 mA, +/-10 VDC) and 2 output channels (10-bit, 0-20 mA and 4-20 mA, 0-10 VDC).
- 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; no integrated EMI filter; not internally bypassed.
- Reverse capability is built in; programming language is ladder logic (GSLOGIC drive PLC software and GSOFT2 configuration software).
- Shipping weight is 15.5 lb (about 7.03 kg); country of origin India.

## Sources

1. [DURApulse AC High-performance Drive: 460 VAC, 20hp with 3-phase input, (VFD) (PN# GS4-4020) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/high-performance_vfds/gs4-4020) (accessed 2026-10-26)
2. [GS4 4020 cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/GS4-4020_cutsheet.pdf) (accessed 2026-10-26)

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