Siemens SIRIUS 3RT1023-3BB40-1AA0 — Power Contactor, Size S0, 24 VDC Coil
Rated for AC-3 motor duty, it handles 4.5 kW at 500 V and 5.5 kW at 690 V, with an AC-4 breaking current of 8.5 A at 400 V for reversing or inching applications. The coil draws 5.4 W during both pick-up and hold, so the control transformer sizing is straightforward — no inrush spike to over-spec for. For short-circuit protection, Type 1 coordination calls for a 63 A gL/gG fuse; Type 2 requires 25 A.
Side-by-side mounting is permitted with zero gap, which simplifies busbar and wiring runs in a multi-contactor motor control center. The IP20 front protection means the contactor is safe for finger contact inside a closed panel; the terminals themselves carry IP00, so live parts are exposed only during wiring. Depth of 101 mm leaves clearance for standard 120 mm deep enclosures.
Auxiliary Contact Switching Capacity
The integrated auxiliary contacts (1 NO + 1 NC, instantaneous) are rated for switching at various control voltages: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, and 0.3 A at 220 V DC. These ratings cover most PLC output and relay interface loads without an additional interposing relay.