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AutomationDirect DURApulse GS21-21P0

The GS21-21P0 is a DURApulse GS20 series general-purpose AC variable frequency drive sold by AutomationDirect in an enclosed B2 frame. It takes single-phase 230 VAC input and drives a three-phase induction or permanent magnet AC motor rated 1 hp, using SVC, V/Hz, FOC or torque control modes. It has integrated dynamic braking, an RS-485 port with Modbus slave protocols, discrete and analog I/O, and a keypad mounted on the drive.

Source checked12/12 values · 2026-10-26AutomationDirectVFD
Rated power
0.7457kW
Rated current
4.8A
IP rating
IP20
Weight
1.2927kg

Specification

2 sources
Categoryvfd
Supply voltage230 VAC
Frame sizeB2
Output typePWM output
Operating temp min-20 °C
Operating temp max50 °C

Quick answers

How much does the AutomationDirect DURApulse GS21-21P0 weigh?
1.2927 kg, per DURApulse AC General Purpose Drive: 230 VAC, 1hp with 1-phase input, (VFD) (PN# GS21-21P0) | AutomationDirect (automationdirect.com).
What is the IP rating of the AutomationDirect DURApulse GS21-21P0?
IP20, per DURApulse AC General Purpose Drive: 230 VAC, 1hp with 1-phase input, (VFD) (PN# GS21-21P0) | AutomationDirect (automationdirect.com).

Study notes

  • Control modes are SVC, V/Hz, FOC and torque; output frequency range is 0.1-599 Hz and carrier frequency range is 2-15 kHz.
  • Discrete I/O: 7 inputs at 24 VDC (sinking/sourcing) and 3 outputs rated 240 VAC / 48 VDC, including one Form C (SPDT) relay; relay load 3 A per point, discrete 50 mA per point.
  • Analog I/O: 2 inputs (0-20 mA, 4-20 mA, +/-10 VDC, 10-bit and 12-bit resolution) and 1 output (0-20 mA, 4-20 mA, 0-10 VDC, 10-bit).
  • Communications: one RS-485 port on RJ45 and one USB B port, up to 115.2k baud, Modbus RTU Slave and Modbus ASCII Slave.
  • EtherNet/IP and Modbus TCP are only available through an optional communication card, not built in.
  • Programming language stated as ladder; GSLOGIC drive PLC software and GSOFT2 configuration software are listed for the drive.
  • Connector type is spring clamp terminals; mounting is panel or wall; drive has no integrated EMI filter and is not internally bypassed.
  • Rated 4.8 A continuous and 5 A for variable torque duty with single-phase 230 VAC input; the 1 hp figure applies to 1-phase input.
  • Item shipping weight is stated as 2.85 lb (about 1.29 kg), not the net drive weight.
  • Supplied with a keypad (GS20A-KPD) attached to the drive and a quick start insert.

Safety

  • Safe Torque Off (STO) is built in.
  • Enclosure rating is IP20, so the drive is not protected against water or dust ingress.
  • Rated ambient temperature range is -20 to +50 deg C.
  • A user-supplied external fuse is required.
  • Agency approvals: UL Listed file E198015; CE declaration; RoHS compliant; no UL Recognized, UL Hazardous or CSA file listed.
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