# AutomationDirect GS21-20P5

Hardware · `GS21-20P5` · verification: source checked

The GS21-20P5 is an enclosed DURApulse GS20 series general purpose AC variable frequency drive. It takes single-phase 230 VAC input and produces three-phase output for 3-phase induction and permanent magnet AC motors, rated 2.8 A continuous and 1/2 hp with 1-phase input. It supports SVC, V/Hz, FOC and torque control modes and includes integrated dynamic braking, an attached keypad and RS-485/USB communications.

## Specification

| Property | Value |
|---|---|
| Category | vfd |
| Supply voltage | 230 VAC, 1-phase |
| Rated current | 2.8 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

- Safe Torque Off (STO) is built in.
- Enclosure rating IP20.
- Temperature rating -20 to +50 deg C.
- A user-supplied external fuse is required.
- UL Listed File # E198015; CE declaration and RoHS status available.

## Study notes

- Control modes: SVC, V/Hz, FOC or torque.
- Input: 230 VAC single-phase; output: 230 VAC three-phase.
- Amperage rating 2.8 A; variable torque amperage rating 3.2 A.
- Output frequency range 0.1-599 Hz; carrier frequency range 2-15 kHz.
- Communications: RS-485 (RJ45) and USB B; Modbus RTU Slave and Modbus ASCII Slave, up to 115.2k baud.
- Optional EtherNet/IP and Modbus TCP card available (not built in).
- Analog I/O: 2 input channels (10-bit and 12-bit) accepting +/-10 VDC or 0-20/4-20 mA; 1 output channel (10-bit) 0-10 VDC or 0-20/4-20 mA.
- Discrete I/O: 7 sinking/sourcing inputs at 24 VDC; 3 relay/sinking/sourcing outputs at 240 VAC and 48 VDC, including one Form C (SPDT) relay.
- Load current 3 A/point for relay outputs, 50 mA/point for discrete outputs.
- Programming language: ladder; spring clamp terminals.
- Frame size A3; panel or wall mounting; integrated dynamic braking; no integrated EMI filter; reverse capability built in.
- Supplied with an attached keypad (GS20A-KPD) and a quick start insert.

## Sources

1. [DURApulse AC General Purpose Drive: 230 VAC, 1/2hp with 1-phase input, (VFD) (PN# GS21-20P5) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/general_purpose_vfds/gs21-20p5) (accessed 2026-10-26)
2. [GS21 20P5 cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/GS21-20P5_cutsheet.pdf) (accessed 2026-10-26)

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