The Siemens SIRIUS 3RT1936-1CD00 is an RC-type surge suppressor designed to bolt onto S2 and S3 contactors, suppressing voltage spikes across the coil terminals. It handles 127...240 V at 50 Hz and 240...127 V at 60 Hz, plus 150...250 V DC — so it covers both AC and DC control circuits common in mixed-voltage panels. The RC element snubs the inductive kick when the contactor drops out, which keeps transients off the PLC output or relay contacts driving the coil.
Siemens 3RT1936-1CD00 SIRIUS Surge Suppressor, RC, 127-240V
MPN3RT1936-1CD00
Siemens SIRIUS 3RT1936-1CD00 RC surge suppressor, 127...240V AC / 150...250V DC, for contactors size S2 and S3.
Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026
Specifications
| Parameter | Value |
|---|---|
| Control supply voltage type | AC/DC |
| Rated value @ 50 Hz | 127 ... 240V |
| Parameter | Value |
|---|---|
| At DC | 150 ... 250V |
| At 60 Hz | 240 ... 127V |
| 1 rated value | 50Hz |
| 2 rated value | 60Hz |
| Design of the surge suppressor | with RC elements |
Product details
Frequently asked questions
Will 3RT1936-1CD00 fit a contactor size S0 like 3RT1023-1AL20?
No. This suppressor is sized for S2 and S3 contactor frames only. The S0 frame uses a different physical interface — the 3RT1936-1CD00 will not latch onto an S0 contactor.
MPN
3RT1936-1CD00