# AutomationDirect DURApulse GS31-21P0

Hardware · `GS31-21P0` · verification: source checked

The GS31-21P0 is an enclosed DURApulse GS30 series AC variable frequency drive. It accepts 230 VAC single-phase input and provides three-phase output for a 1 hp motor, using SVC, V/Hz, FOC, encoder or torque control modes. It includes RS-485 Modbus RTU/ASCII communication, USB, integrated dynamic braking and built-in Safe Torque Off (STO).

## Specification

| Property | Value |
|---|---|
| Category | vfd |
| Supply voltage | 230 VAC |
| Rated power | 0.745699872 kW |
| Frame size | B2 |
| 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.
- A user-supplied external fuse is required.

## Study notes

- Single-phase 230 VAC input, three-phase output.
- Control modes: SVC, V/Hz, FOC, encoder or torque.
- Communication: one RS-485 (RJ45) port and one USB B port; Modbus RTU Slave and Modbus ASCII Slave, up to 115.2k baud.
- Integrated dynamic braking.
- Carrier frequency range 2–15 kHz; output frequency range 0.1–599 Hz.
- Mounting: 35 mm DIN rail, panel or wall.
- Programming language: Ladder.
- For use with 3-phase induction and permanent magnet AC motors.
- Optional communication, encoder and I/O modules are available.
- Integrated EMI filter: No.
- Analog inputs: 2 channels, current/voltage, 12-bit; analog outputs: 1 channel, current/voltage, 10-bit.
- Discrete I/O: 7 inputs (24 VDC sinking/sourcing) and 3 outputs (relay/sinking/sourcing).

## Sources

1. [DURApulse AC High-performance Drive: 230 VAC, 1hp with 1-phase input, (VFD) (PN# GS31-21P0) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/high-performance_vfds/gs31-21p0) (accessed 2026-10-26)
2. [GS31 21P0 cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/GS31-21P0_cutsheet.pdf) (accessed 2026-10-26)

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