What this part is and where it lands
The 3RT2926-1CB00-ZX90 is a Siemens SIRIUS surge suppressor with RC elements, designed to clip onto size S0 contactors. It suppresses voltage spikes from the coil circuit when the contactor de-energises, protecting nearby electronics and extending contact life.
Voltage coverage and supply type
Rated for AC 24-48V at 50 Hz and DC 24-70V, it handles both control supply types with a single unit. The AC/DC designation means you can run it off either rail without swapping parts. At 60 Hz the rated range is 48-24V — note the reversed order, which is how the manufacturer lists it. The part covers the same 24-48V window regardless of line frequency.
Mechanical fit and panel integration
Clip-on fastening to the contactor front, no DIN rail footprint needed. The 12 mm depth, 30 mm width, and 19 mm height keep it inside the contactor envelope, so it doesn't eat panel space. Mounting position is any — no derating required for horizontal or inverted orientation. Operating temperature range is -25 to +60 °C, storage -40 to +80 °C.
Lifecycle and sourcing posture
Sourced to order against the BOM quantity through independent distribution.