The Siemens 3RT7926-1CF00 is a SIRIUS RC surge suppressor designed to clip directly onto 3RT7 S0-size contactors. It suppresses voltage spikes across the coil terminals, protecting the control circuit from inductive kickback when the contactor de-energizes. The RC element design handles the transient energy without the polarity constraints of a diode, making it a drop-in fit for AC coil circuits. Dimensions are compact: 12 mm deep, 30 mm wide, 19 mm tall. The clip-on fastening means no wiring is needed — it pushes onto the contactor's coil terminals and is held by the existing connection springs.
Integration
Mounts in any position — vertical, horizontal, or flat — on the contactor face. The RC element is self-contained; no additional wiring or panel space is consumed beyond the contactor's own footprint. Operating temperature range is -10 to +55 °C; storage range extends from -25 to +70 °C. Suitable for standard industrial control panels without derating in most indoor environments.