The Siemens 3RH1140-1BG40-0AA6 is a SIRIUS auxiliary contactor — a control-circuit device that provides four normally-open (NO) instantaneous contacts for signaling, interlocking, or extending the contact count of a main contactor or starter. Rated operational current is 10 A at 24 V, derating to 6 A at 230 V and 1 A at 690 V.
The 3RH1140-1BG40-0AA6 occupies a 45 mm wide by 57.5 mm high by 72 mm deep footprint on the DIN rail. Screw terminals accept solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm².
Electrical and environmental ratings
Shock resistance is rated at 10g for 5 ms and 5g for 10 ms. Mechanical endurance is typical 30 million switching cycles.