Output Reactor for VFD Motor Protection
The SIDAC 4EP3706-0GS01 is a 3-phase AC output reactor (choke) rated for a maximum continuous current of 4.4 A and a rated frequency of 4000 Hz. It provides an inductance of 0.0032 H (3.2 mH) per phase, sized to limit the rate of voltage rise (dV/dt) and peak currents from a variable-frequency drive to the motor windings, extending motor life on long cable runs or with older insulation systems. Rated for a 480 V line (per the description), it is built to EN 61558-2-20 and carries a UL 508 listing, making it suitable for panel builds requiring third-party certification in North American and European markets. Connection is via screw-type terminals, which simplifies field wiring with standard ring or fork lugs.
Thermal and Sizing Considerations
Total power loss splits between the coil (10.7 W) and the iron core (12.6 W), summing to 23.3 W of heat to be dissipated inside the enclosure. The reactor is built to thermal class F (155 °C insulation system per IEC 60085) and is rated for a 60 °C ambient — derate the 4.4 A if cabinet ambient exceeds that. Dimensions are 0.17 m wide by 0.15 m tall by 0.1 m deep — a compact footprint for a 4 A-class reactor, but verify clearance for the screw terminals and airflow when laying out the panel.