# AutomationDirect GS33-4025

Hardware · `GS33-4025` · verification: source checked

The GS33-4025 is a DURApulse GS30 series enclosed AC variable frequency drive for 460 VAC three-phase input and 25 hp motors. It supports SVC, V/Hz, FOC, encoder and torque control modes, includes integrated dynamic braking, and communicates over RS-485 using Modbus RTU or Modbus ASCII. Optional communication, encoder and I/O modules expand its interfaces.

## Specification

| Property | Value |
|---|---|
| Category | vfd |
| Supply voltage | 460 VAC |
| Rated power | 18.6424968 kW |
| Rated current | 38 A |
| Frame size | F |
| 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

- Safe Torque Off (STO) is built-in.
- UL Listed File # E198015.
- CE marked; RoHS compliant; EU REACH document available.
- User-supplied external fuse required.

## Study notes

- Control modes: SVC, V/Hz, FOC, encoder or torque.
- Integrated dynamic braking and built-in reverse capability.
- Communication ports: one RS-485 (RJ45) and one USB B; baud rate up to 115.2k.
- Carrier frequency range 2–15 kHz; output frequency range 0.1–599 Hz.
- Two analog inputs: 12-bit, 0–20 mA and 4–20 mA, or ±10 VDC.
- One analog output: 10-bit, 0–20 mA and 4–20 mA, or 0–10 VDC.
- Seven discrete inputs: 24 VDC, sinking/sourcing, two non-isolated commons.
- Three discrete outputs: relay/sinking/sourcing, 240 VAC and 30 VDC; one Form C (SPDT) relay.
- Programming language: ladder.
- For use with 3-phase induction and permanent magnet AC motors.
- Optional communication, encoder and I/O modules available.
- Variable torque amperage rating: 41.5 A.

## Sources

1. [DURApulse AC High-performance Drive: 460 VAC, 25hp with 3-phase input, (VFD) (PN# GS33-4025) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/high-performance_vfds/gs33-4025) (accessed 2026-10-26)
2. [GS33 4025 cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/GS33-4025_cutsheet.pdf) (accessed 2026-10-26)

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