The Siemens SIRIUS 3RT1916-1BC00-ZX90 is a varistor-type surge suppressor designed to plug directly onto S00-size contactors. It handles 48...127 V AC and 70...150 V DC coil circuits, clamping voltage transients that would otherwise weld contacts or damage the coil driver. The multi-unit packaging ships 10 pieces per order code.
The suppressor snaps onto the front of any S00-size SIRIUS contactor — no additional wiring or DIN-rail space needed. The voltage window covers 48...127 V AC and 70...150 V DC.