Auxiliary contactor, SIRIUS, size S00, 24 VDC coil, 3 NO
The Siemens 3RH1131-1BB40-ZW96 is a SIRIUS auxiliary contactor in the S00 frame size, carrying three normally-open instantaneous contacts and a 24 VDC magnet coil. The coil draws 3.2 W during both closing and holding, so the power supply budget is flat — no inrush spike to size for.
Switching capacity and contact ratings
Contact ratings are given per the IEC utilization categories, with the 24 VDC rated value at 10 A. At 230 V the contactor switches 6 A; at 400 V it drops to 3 A; at 690 V it is rated for 1 A. For DC switching at 110 V the rating is 1 A, and at 220 V it is 0.27 A. These are the values to use when sizing for a specific load voltage — the 10 A figure at 24 V is the highest, but the derating curve above that is steep.
Mechanical endurance and contact reliability
If you are switching logic-level signals, the contact metallurgy is designed for that regime.
Shock resistance is 10g / 5 ms and 5g / 10 ms.
The auxiliary contact terminals accept solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and 2x 4 mm². For AWG, the range is 2x (20 to 16), 2x (18 to 14), and 1x 12. Surge voltage withstand is rated at 6 kV. The contactor is designed for screw-type terminals, so torque values per the Siemens installation instructions apply.