The Siemens 3RT1916-1BB00-ZX90 is a SIRIUS varistor-type surge suppressor designed to plug directly onto Size S00 contactors, protecting the coil circuit from voltage transients. It covers a control voltage range of 24...48 V AC and 24...70 V DC, and ships in multi-unit packaging of 10 units.
This part carries a lifecycle status of 'current' but the manufacturer's own description flags it as a phased-out product. The official successor is the SIRIUS 3RT2 series. For BOM continuity, the 3RT2 equivalent should be evaluated for new designs; for existing panels, the 3RT1916-1BB00-ZX90 can still be sourced through independent distribution channels against an RFQ.
Integration & Fit
Designed for snap-on mounting onto the coil terminals of S00 contactors — no additional wiring or DIN-rail space needed. The varistor clamps voltage spikes at the coil, extending contactor life in inductive switching applications like motor starters or valve controls.