# AutomationDirect GS21-20P2

Hardware · `GS21-20P2` · verification: source checked

The AutomationDirect GS21-20P2 is a DURApulse GS20 series general-purpose AC variable frequency drive in an A1 frame. It accepts single-phase 230 VAC input and provides three-phase 230 VAC output for 3-phase induction and permanent magnet AC motors. It supports SVC, V/Hz, FOC and torque control modes and includes integrated dynamic braking, RS-485 communication and built-in Safe Torque Off.

## Specification

| Property | Value |
|---|---|
| Category | vfd |
| Supply voltage | 230 VAC, 1-phase |
| Rated power | 0.186424968 kW |
| Rated current | 1.6 A |
| Frame size | A1 |
| 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).
- IP20 enclosure; operating temperature range -20 to +50 °C.
- UL Listed File # E198015; CE; RoHS.
- User-supplied external fuse required.

## Study notes

- GS20 series general-purpose drive; A1 frame.
- Single-phase 230 VAC input; three-phase 230 VAC output.
- Control modes: SVC, V/Hz, FOC or torque.
- Integrated dynamic braking; built-in reverse capability; no integrated EMI filter; not internally bypassed.
- RS-485 (RJ45) and USB B ports; Modbus RTU/ASCII slave up to 115.2k baud.
- Optional EtherNet/IP and Modbus TCP card available.
- I/O includes 7 discrete inputs, 3 discrete outputs with one Form C relay, 2 analog inputs and 1 analog output.
- Output frequency range 0.1–599 Hz; carrier frequency range 2–15 kHz; spring clamp terminals.
- For use with 3-phase induction and permanent magnet AC motors; programming language is ladder.
- Variable torque amperage rating is 1.8 A.

## Sources

1. [DURApulse AC General Purpose Drive: 230 VAC, 1/4hp with 1-phase input, (VFD) (PN# GS21-20P2) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/general_purpose_vfds/gs21-20p2) (accessed 2026-10-26)
2. [GS21 20P2 cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/GS21-20P2_cutsheet.pdf) (accessed 2026-10-26)

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