What the 3RT6926-1BE00 varistor does in the panel
This is a varistor-type surge suppressor designed to clamp voltage transients across the coil of a SIRIUS S0 contactor — it protects the PLC output or relay driving the contactor from the inductive kickback when the coil de-energises. The clip-on fastening method means it snaps directly onto the S0 contactor without tools — no wiring needed, it bridges the coil terminals internally.
Physical fit — S0 footprint and mounting
Dimensions are 12 mm deep, 30 mm wide, and 19 mm high — the S0 size matches the standard SIRIUS contactor frame, so it adds negligible depth to the assembly.
RoHS compliance date is 05/01/2012, meaning it meets the EU substance restrictions for current manufacturing.