The Siemens 3RT1015-2BB42-ZW96 is a SIRIUS power contactor in frame size S00, built for switching motor loads and resistive circuits in control panels. The 24 VDC coil pulls in at 85 % of rated voltage and holds at 3.3 W — a steady-state draw low enough that a standard 24 VDC power supply can drive it without headroom issues. Spring-loaded terminals on the main circuit accept 2x (0.25... 2.5 mm²) solid or stranded, so the wireman strips to 8 mm and clicks the conductor in; no screw torque to verify.
Mounting and panel fit
Snaps onto 35 mm DIN rail per EN 50022, or screws directly to a backplate. At 45 mm wide and 73 mm deep, it leaves room alongside other S00 devices for a compact MCC or motor control center bucket. Side-by-side mounting is permitted — no derating gap required — so the panel builder can pack them at 45 mm pitch. Pollution degree 3 rating means it tolerates conductive dust in industrial enclosures without conformal coating.
Switching capacity and coordination
Rated for AC-1 resistive loads up to 10 A at 24 V and AC-12 maximum operating current of 10 A. For motor duty at 400 V, the AC-2 rating is 3 kW and AC-4 breaking current is 6.5 A. With type 2 coordination (no weld risk), the required upstream fuse is gL/gG 20 A; type 1 coordination allows a 35 A fuse. The contactor's mechanical life is 30 million operations typical — relevant for high-cycle applications like conveyor indexing or valve actuation.