Shunt trip for SENTRON 3VM breakers
The Siemens 3VM9908-0BL20 is a shunt trip accessory for the SENTRON 3VM molded-case circuit breaker family, rated for breakers up to 630 A. It accepts a control supply voltage of 380–600 V AC at 50/60 Hz, drawing a maximum apparent power of 40 VA. This is the left-side mounted variant, designed to trip the breaker remotely via a control signal — typical for emergency-stop circuits or supervisory shutdown in panel builds.
Dimensions are 25.7 mm wide, 65.1 mm high, and 31.2 mm deep — a compact add-on that clips onto the left side of the 3VM breaker without expanding the DIN-rail footprint. The 10 mm stripped length on the control wiring matches standard ferrule preparation for spring-cage or screw terminals in the panel.
Electrical ratings and environment
Pollution degree 3 means the part tolerates conductive dust or condensation typical in industrial enclosures not hermetically sealed.