{"id":"automationdirect-gs4-21p0","model_id":"GS4-21P0","name":"AutomationDirect GS4-21P0","summary":"The GS4-21P0 is a DURApulse GS4 series AC high-performance variable frequency drive in a NEMA 1 enclosure. It operates from 230 VAC with either 3-phase or 1-phase input and provides 1 hp or 1/2 hp respectively. It supports SVC or V/Hz control, has an RS-485 port, and includes integrated dynamic braking.","study_notes":["Input phases: 3 and 1; output phases: 3.","Horsepower: 1 hp with 3-phase input, 1/2 hp with 1-phase input.","Amperage: 4.8 A with 3-phase input, 2.4 A with 1-phase input; variable torque rating 5 A.","Control modes: SVC or V/Hz.","RS-485 (RJ12) port supports Modbus RTU, Modbus ASCII, and BACnet at up to 115.2k baud.","Optional EtherNet/IP and Modbus TCP cards are available.","Input signal: 4–20 mA, voltage, or potentiometer input.","Output frequency range: 0.1–599 Hz; carrier frequency range: 2–15 kHz.","8 discrete inputs (24 VDC, sinking/sourcing); 4 discrete outputs (relay/sinking/sourcing).","3 analog inputs (11-bit) and 2 analog outputs (10-bit).","Integrated dynamic braking and built-in reverse capability.","For use with 3-phase induction motors; programming language: ladder; screw terminals."],"safety_notes":["Built-in Safe Torque Off (STO) function.","UL Listed, file E198015.","CE marked and RoHS compliant; EU REACH documentation available.","Rated ambient temperature range: -10 to +50 °C.","External fuse is user-supplied."],"sources":[{"url":"https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/high-performance_vfds/gs4-21p0","title":"DURApulse AC High-performance Drive: 230 VAC, 1hp with 3-phase input, 1/2hp with 1-phase input, (VFD) (PN# GS4-21P0) | AutomationDirect","accessed":"2026-10-26"},{"url":"https://cdn.automationdirect.com/static/specs/cutsheet/GS4-21P0_cutsheet.pdf","title":"GS4 21P0 cutsheet","accessed":"2026-10-26"}],"verification":{"status":"source_checked","checked_at":"2026-10-26","values":9,"method":"llm_source_check"},"updated_at":"2026-10-26","type":"hardware","spec":{"category":"vfd","manufacturer":"automationdirect","controllers":[],"supply_voltage":"230 VAC","frame_size":"A","output_type":"PWM output","ip_rating":"IP20","operating_temp_min_c":-10,"operating_temp_max_c":50,"joints":[],"protocols":["modbus-rtu","modbus-ascii"],"standards":[],"error_codes":[]},"url":"https://machineschema.com/hardware/automationdirect-gs4-21p0","license":"https://creativecommons.org/licenses/by/4.0/"}