S00 auxiliary contactor with 5 NO
The Siemens 3RH2353-1CU00-0KA0 is a SIRIUS auxiliary contactor in size S00, carrying five normally-open instantaneous contacts. It is designed for control-circuit switching — interlocks, signal feedback, and logic-level isolation inside a motor starter or contactor assembly. At 400 V AC it still switches 3 A, so it can break control transformer primaries or small solenoid valves directly.
The DC arc extinguishes more slowly than AC, so the current drops sharply above 110 V — a factor to check if this contactor is used in a DC control bus or battery-backed circuit. The degree of pollution is 3, meaning it tolerates conductive dust and condensation typical of industrial enclosures without conformal coating.
Panel fit and mounting flexibility
These are the minimum air gaps to adjacent metalwork or other devices — crowding them reduces the dielectric withstand and can cause tracking under pollution degree 3 conditions.
The part carries RoHS compliance with a substance prohibition date of 07/01/2006.