The Siemens 3RT1916-1BB00 is a varistor-type surge suppressor from the SIRIUS family, designed to clip onto Size S00 contactors to suppress voltage spikes across the coil. It accepts both AC and DC control supply voltages: 24 to 48 V AC at 50/60 Hz, and 24 to 70 V DC. The clip-on fastening method means it snaps directly onto the contactor without additional wiring or DIN-rail space — a clean retrofit for an existing S00 panel layout.
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The 24 to 48 V AC range covers standard 24 V and 48 V control transformers; the 24 to 70 V DC range handles nominal 24 V DC supplies with headroom for a 48 V or 60 V DC bus. A varistor clamps the coil voltage at a fixed threshold — no polarity concerns, unlike a diode suppressor. The varistor derates above 60 °C; no derating curve is published here, so keep ambient below 60 °C for full clamping performance.
Clip-on mounting in any position — no DIN-rail slot consumed. The suppressor sits on the contactor's coil terminals.