# AutomationDirect GS33-4020

Hardware · `GS33-4020` · verification: source checked

The GS33-4020 is an enclosed DURApulse GS30 series AC variable frequency drive for 460 VAC three-phase input, rated 20 hp. It controls three-phase induction and permanent magnet AC motors with SVC, V/Hz, FOC, encoder, or torque modes. It provides RS-485 Modbus RTU/ASCII communication, integrated dynamic braking, and built-in Safe Torque Off (STO).

## Specification

| Property | Value |
|---|---|
| Category | vfd |
| Weight | 5.1618811706 kg |
| Supply voltage | 460 VAC |
| Rated power | 14.91399744 kW |
| Rated current | 32 A |
| Frame size | E |
| Output type | PWM output |
| IP rating | IP20 |
| Operating temp min | -20 °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) function is stated.
- Enclosure rating is IP20; the drive is for panel or wall mounting.
- Operating temperature range is -20 to +50 °C.
- A user-supplied external fuse is required.
- Agency approvals stated: UL Listed File E198015, CE, and RoHS. No UL Recognized, UL Hazardous, or CSA file is stated.

## Study notes

- Control modes: SVC, V/Hz, FOC, encoder, or torque.
- Integrated dynamic braking is built in.
- Communication ports: one RS-485 (RJ45) and one USB B.
- Modbus RTU and Modbus ASCII slave protocols, up to 115.2k baud.
- Carrier frequency range: 2–15 kHz; output frequency range: 0.1–599 Hz.
- Analog I/O: 2 input channels (12-bit, current/voltage) and 1 output channel (10-bit, current/voltage).
- Discrete I/O: 7 sinking/sourcing inputs at 24 VDC and 3 relay/sinking/sourcing outputs rated 240 VAC and 30 VDC.
- Variable torque amperage rating is 36 A.
- Designed for 3-phase induction and permanent magnet AC motors.
- Programming language: ladder.
- Optional communication, encoder, and I/O modules are available.
- Input signals: 4–20 mA, voltage, potentiometer, or pulse train.

## Sources

1. [DURApulse AC High-performance Drive: 460 VAC, 20hp with 3-phase input, (VFD) (PN# GS33-4020) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/high-performance_vfds/gs33-4020) (accessed 2026-10-26)
2. [GS33 4020 cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/GS33-4020_cutsheet.pdf) (accessed 2026-10-26)

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