# AutomationDirect GS21-10P2

Hardware · `GS21-10P2` · verification: source checked

The GS21-10P2 is an enclosed DURApulse GS20 series general-purpose AC variable frequency drive. It runs from a single-phase 120 VAC supply and produces three-phase 230 VAC output for a 1/4 hp motor. It supports SVC, V/Hz, FOC and torque control modes, has an RS-485 port for Modbus RTU/ASCII, integrated dynamic braking and built-in Safe Torque Off.

## Specification

| Property | Value |
|---|---|
| Category | vfd |
| Supply voltage | 120 VAC |
| Rated current | 1.6 A |
| Frame size | A1 |
| 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.
- A user-supplied external fuse is required.
- UL Listed File # E198015; CE declaration and RoHS status Yes; EU REACH document available; CSA file: none.
- The drive has no integrated EMI filter.
- Rated temperature range -20 to +50 deg C; enclosure type IP20, panel or wall mounting.

## Study notes

- Rated 1/4 hp with 1-phase input; 1.6 A amperage rating and 1.8 A variable torque rating.
- Input is 120 VAC single-phase; output is 230 VAC three-phase.
- Control modes: SVC, V/Hz, FOC or torque.
- Carrier frequency range 2-15 kHz; output frequency range 0.1-599 Hz.
- Communications: one RS-485 (RJ45) port and one USB B port; Modbus RTU Slave and Modbus ASCII Slave up to 115.2k baud.
- EtherNet/IP and Modbus TCP require an optional communication card; they are not built in.
- I/O: 7 discrete inputs (24 VDC, sinking/sourcing), 3 discrete outputs (relay/sinking/sourcing, one Form C SPDT relay), 2 analog inputs and 1 analog output.
- Analog input ranges 0-20 mA and 4-20 mA, +/-10 VDC, with 10-bit and 12-bit resolution; analog output 0-20 mA, 4-20 mA, 0-10 VDC at 10-bit.
- Input signals accepted: 4-20 mA, voltage, potentiometer or pulse train; output type is PWM.
- Programming language is ladder; connector type is spring clamp terminals.
- Intended for 3-phase induction and permanent magnet AC motors.
- AutomationDirect lists the item shipping weight as 2.3 lb and country of origin as India.

## Sources

1. [DURApulse AC General Purpose Drive: 120 VAC, 1/4hp with 1-phase input, (VFD) (PN# GS21-10P2) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/general_purpose_vfds/gs21-10p2) (accessed 2026-10-26)
2. [GS21 10P2 cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/GS21-10P2_cutsheet.pdf) (accessed 2026-10-26)

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