# AutomationDirect GS21-10P5

Hardware · `GS21-10P5` · verification: source checked

The GS21-10P5 is a DURApulse GS20 series general-purpose AC variable frequency drive. It accepts 120 VAC single-phase input and provides 230 VAC three-phase output for 3-phase induction and permanent magnet AC motors, rated 1/2 hp with a 2.5 A rating. It supports SVC, V/Hz, FOC and torque control modes and includes RS-485 Modbus RTU/ASCII communication, integrated dynamic braking and an optional EtherNet/IP and Modbus TCP card.

## Specification

| Property | Value |
|---|---|
| Category | vfd |
| Supply voltage | 120 VAC |
| Rated current | 2.5 A |
| Frame size | A3 |
| 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).
- User-supplied external fuse required.
- UL Listed file E198015; CE; RoHS compliant.
- No UL Recognized, UL Hazardous or CSA file listed.

## Study notes

- Single-phase 120 VAC input; three-phase 230 VAC output.
- Variable torque rating is 2.7 A.
- Control modes: SVC, V/Hz, FOC and torque.
- Output frequency range 0.1–599 Hz; carrier frequency 2–15 kHz.
- Integrated dynamic braking and built-in reverse capability.
- RS-485 (RJ45) and USB B ports; Modbus RTU/ASCII slave up to 115.2 kbaud.
- Two analog inputs, one analog output, seven discrete inputs and three discrete outputs.
- Discrete output type is relay/sinking/sourcing with one Form C (SPDT) relay.
- Programming language is ladder; spring clamp terminals.
- Optional EtherNet/IP and Modbus TCP card available.
- For use with 3-phase induction and permanent magnet AC motors.
- Integrated EMI filter: No.

## Sources

1. [DURApulse AC General Purpose Drive: 120 VAC, 1/2hp with 1-phase input, (VFD) (PN# GS21-10P5) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/general_purpose_vfds/gs21-10p5) (accessed 2026-10-26)
2. [GS21 10P5 cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/GS21-10P5_cutsheet.pdf) (accessed 2026-10-26)

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