The Siemens 3RT1936-1ER00 is a SIRIUS surge suppressor with diode assemblies, designed for 24 V DC control supply voltage. It suppresses the inductive kickback from a contactor coil when de-energized, protecting nearby electronics and prolonging contact life.
The 3RT1936-1ER00 is marked as a phased-out product. The official SIRIUS 3RT2 preferred successor is the 3RT2936-1ER00, which shares the same diode design and 24 V DC rating but is built for the current 3RT2 contactor platform. Availability is confirmed per inquiry.
Rated for 24 V DC only — the diode assemblies are polarity-sensitive, so verify the control circuit orientation before installation. Installing on an AC coil will not suppress correctly and may damage the diode stack. The suppressor clips directly onto the contactor's coil terminals, adding minimal depth to the existing DIN-rail assembly. No additional wiring or enclosure space is needed beyond the contactor footprint.