The Siemens 3RV1952-1EF0 is a SIRIUS shunt release — a remote-trip accessory for the size S00 and S0 motor-protective circuit breakers in the 3RV13 and 3RV10 families. It sits on the left side of the breaker, wired to a control voltage, and when energized it mechanically trips the breaker independent of any overload or short-circuit condition. That makes it the part you spec when a safety circuit, an E-stop button, or a PLC digital output needs to kill motor power remotely without waiting for the thermal overload to heat up. The coil accepts 220…240 V AC or 220…250 V DC — dual-rated, so it works on either supply without a separate rectifier. The front is finger-safe per IEC 60529 (IP20), meaning an operator reaching into the panel from the front cannot contact live terminals. That matters for panel builders who need to keep the IP20 rating on the enclosure door open.
The part is at a current lifecycle stage.