The Siemens 3RT2916-1CE00 is a surge suppressor built as an RC element (resistor-capacitor snubber) for the SIRIUS S00 contactor family. It clips directly onto the contactor coil terminals — no wiring, no additional DIN-rail space. The 9 mm depth and 28 mm width mean it adds negligible footprint inside the panel; the contactor itself remains the dimension driver.
Voltage range and what it suppresses
Without it, the inductive kick from the coil can arc across auxiliary contacts, degrade the coil insulation over repeated cycles, or couple noise into nearby control wiring. The RC snubber gives the stored energy a low-impedance path, so the coil voltage decays cleanly.
Which contactors it fits
This suppressor is designed for the S00 frame size — specifically the 3RT2.1 power contactors and 3RH2 auxiliary contactor series. It clips onto the coil terminals; no screwdriver, no additional wiring. If you are sourcing for a 3RT2.1 or 3RH2 on a BOM, this is the intended RC snubber.