What this surge suppressor is and why it matters
The Siemens 3RT1926-1CC00 is a SIRIUS RC-element surge suppressor designed to mount directly onto Size S0 contactors, suppressing voltage spikes from the coil circuit during switching. The RC element absorbs the inductive kick from the contactor coil, protecting nearby PLC outputs, relays, and sensitive electronics from conducted transients.
Lifecycle status and the direct replacement path
This part is a phased-out product per the manufacturer's own description, with the official successor being the SIRIUS 3RT2926-1CC00. The preferred successor type is 3RT2926-1CC00, which shares the same Size S0 mounting footprint and RC-element design, so panel layout and wiring remain unchanged.
Mounting and environmental fit for panel integration
Designed for Size S0 contactors, this suppressor clips directly onto the contactor's coil terminals — no additional wiring or DIN-rail space needed. The AC/DC control supply voltage type means it handles both line-frequency and DC-coil contactors within the stated voltage windows.