Siemens 3RV1031-4FA10 Motor Controller Circuit Breaker

Siemens 3RV1031-4FA10 is a three-pole Sirius motor protection circuit breaker (size S2) from the 3RV1 family, designed to protect AC motors in control panels and motor starters. It combines overcurrent protection and short-circuit interruption in a compact form factor and is rated for a nominal voltage of 690 V and AC-3 duty. The overload release is adjustable within 28–40 A, enabling protection tuned to motor full-load currents and starting characteristics. The device uses screw-terminal connections and carries an IP20 front rating for indoor panel installation. With a short-circuit current rating of up to 50 kA at 400 V, it can rapidly interrupt faults to safeguard motors and drives. This variant is specified without an auxiliary switch, consistent with distributor listings for 3RV1031-4FA10, and it is part of Siemens' Sirius 3RV1 motor protection lineup intended for compact motor protection in industrial panels.