The Siemens SIRIUS 3RT1916-1JL00 is a varistor-type surge suppressor designed to clip voltage transients across the coil of a contactor. It mounts directly onto S00-frame contactors in the SIRIUS family, protecting the coil from inductive kickback that would otherwise shorten its life or cause nuisance tripping in the control circuit.
Voltage range and control supply
Rated for mixed AC/DC control voltage: 127...240 V at 50 Hz, 240...127 V at 60 Hz, and 70...150 V DC. The AC range is wide enough to cover common 120 V and 230 V line supplies; the DC range suits 110 V and 125 V battery-backed control buses. The varistor clamps across these voltages, so verify the coil's operating range falls within these limits before specifying.
Deployment context
Snaps onto the front of a SIRIUS S00 contactor — no extra DIN rail space needed. The varistor body and LED indicator (if present) sit within the contactor's envelope, so panel layout and wireway clearance remain unchanged. Standard for suppressing coil transients in motor starter and relay panels where the control voltage matches the ranges above.