The Siemens 3RT2916-1BF00-ZX90 is a varistor-type surge suppressor from the SIRIUS family, designed specifically for S00-size contactors and control relays. It clips directly onto the contactor's coil terminals — no wiring required — and suppresses voltage spikes from inductive switching. The 9 mm depth keeps the assembly within the contactor's own envelope — no extra panel depth needed. Clip-on mounting means zero additional wiring labour; the suppressor simply snaps onto the coil terminals of any S00 contactor or relay.
The varistor design handles the inrush energy of the contactor's magnet coil without additional derating.
The 400-600 V AC range covers 50 Hz and 60 Hz control circuits without derating. The 28 mm width and 46 mm height match the S00 contactor footprint exactly — the suppressor sits flush against the contactor body, maintaining the same panel layout. Storage range of -40 to +80 °C accommodates warehouse and shipping extremes.