SIRIUS S00 auxiliary contactor — 4 NO, 24 VDC coil
The Siemens 3RH1140-1BB40-ZW98 is a SIRIUS size S00 auxiliary contactor with a 24 V DC coil, delivering four instantaneous normally-open contacts. It is rated 10 A at 24 V and carries a 30 million mechanical life cycle. The coil draws 3.2 W closing and holding. Screw and snap-on mounting to DIN rail fits standard 45 mm width enclosures. The IP20 front face suits protected panel environments. Operating temperature range is -25 to +60 °C.
Contact ratings by voltage
The auxiliary contacts are rated by utilization voltage: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V. These are thermal current ratings for switching auxiliary loads — not motor starting duty. The 6 kV rated surge voltage provides basic insulation coordination for control circuits. Contact reliability is specified as one incorrect switching operation per 100 million operations at 17 V, 1 mA, suitable for low-energy PLC or signal-level switching.
Termination and wiring
Wire termination accepts solid conductors: 2× (0.5 to 1.5 mm²), 2× (0.75 to 2.5 mm²), or 2× 4 mm². AWG equivalents are 2× (20 to 16), 2× (18 to 14), or 1× 12. The screw terminals are sized for panel wiring with standard ferrule or solid conductors.
Mounting and environment
Mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward. Pollution degree 3 means the contactor tolerates conductive pollution in industrial control panels. Shock resistance is 10g at 5 ms and 5g at 10 ms. Storage and transport temperature range is -55 to +80 °C.