Siemens SIRIUS 3RT1036-1BG40 is a size S2 power contactor rated for motor switching up to 30 kW at 500 V and 11.4 kW at 690 V, with an AC-4 rating of 41 A at 400 V for reversing or inching duty. The 55 mm wide frame snaps onto 35 mm DIN rail per EN 50022 and accepts screw-type terminals on the main circuit — stranded up to 2x 25 mm², solid up to 2x 4 mm².
Dimensions are 55 mm wide, 112 mm high, 130 mm deep — the depth is the panel-space figure you need for enclosure depth clearance.
Duty ratings and operating limits
AC-3 switching (starting/running motors) is rated at 800 operations per hour maximum; AC-4 (plugging/reversing) is limited to 300 ops/h. The coil dropout time on DC is 20 to 25 ms, arcing time 10 to 15 ms — useful when timing interlock sequences. Substance prohibitance compliance dated 05/01/2012 covers RoHS and REACH requirements.