The Siemens SIRIUS 3RV1936-3AB4 is a motor remote operating mechanism designed specifically for S2-size circuit-breakers. It provides remote motorized open/close control of the breaker, running on a 24 V DC control supply (rated value 24 V, operating range 20.4... 26.4 V). This is a phased-out product, so sourcing goes through independent distribution channels — quoted to order against an RFQ.
What the ratings mean for fit
The mechanism is sized for S2-frame circuit-breakers — that's the physical interface. Mounting is by screw fixing in any position, with zero clearance required upwards, forwards, backwards, downwards, and at the sides. That means it fits tight in a panel without needing breathing gaps around the mechanism body. The 224 mm height, 148 mm width, and 211 mm depth define the envelope; verify your enclosure door clearance and DIN-rail backplane layout against those numbers. Operating frequency is capped at 25 operations per hour — that's the mechanical limit for the motorized drive. Not a part for high-cycle jogging; it's for occasional remote switching of the breaker, say for emergency stop reset or remote disconnect.
Environmental and compliance
Operating temperature range is -20... +70 °C; storage range is -50... +80 °C. Shock resistance is rated at 25g / 11 ms, so it survives handling and moderate vibration in the panel. The part carries a substance prohibitance date of 03/01/2017 (RoHS / REACH compliance cutoff).