SIRIUS 3RT1024-1BB44-3MA0 — Power Contactor, Size S0, 24 VDC
The Siemens SIRIUS 3RT1024-1BB44-3MA0 is a Size S0 power contactor with a 24 V DC magnet coil, designed for screw-and snap-on mounting onto 35 mm standard mounting rail per DIN EN 50022. It carries a 5.5 kW motor rating in AC-2 duty at 400 V and reaches 7.5 kW at both 500 V and 690 V, with an AC-4 reversing-duty current of 12.5 A at 400 V. The coil draws 5.4 W during both closing and holding, and the contactor is rated for 10 million mechanical cycles typical. The 45 mm wide, 85 mm high, 150 mm deep footprint fits standard panel layouts. The front face carries an IP20 rating; the terminal area is IP00, meaning the wiring zone is open and requires enclosure protection in service. Screw-type terminals on both the main and auxiliary/control circuits accept the listed wire ranges: 2x (0.5–1.5 mm²) and 2x (0.75–2.5 mm²) solid, up to 2x (0.75–4 mm²) max for control wiring; main contacts take 2x (1–2.5 mm²) and 2x (2.5–6 mm²) solid or stranded, max 2x 10 mm².
Coil and Switching Characteristics
The 24 V DC coil picks up at 0.8× rated (19.2 V) and drops out at 1.1× rated (26.4 V) — the dropout margin is tight, so verify supply stability under load. The coil holds at 5.4 W continuously. For the auxiliary contacts, the 24 V DC switching capacity is 10 A; at 60 V it drops to 2 A, at 110 V to 1 A, at 220 V to 0.3 A. The AC-12 maximum operational current for auxiliary contacts is also 10 A. Operating temperature range is -25 to +60 °C during operation, with pollution degree 3 (conductive pollution typical in industrial enclosures). Side-by-side mounting is permitted without derating — useful when packing multiple contactors on a rail.
Fault Coordination and Compliance
For type of coordination 2 (no welding after short circuit), the required backup fuse is gL/gG 25 A. For type of coordination 1 (welding allowed), it is gL/gG 63 A. The contactor is in current lifecycle stage — no phase-out or last-time-buy notice on record. RoHS compliance date is 01.07.2006, covering the EU RoHS baseline. The reference code per IEC 81346-2 is Q (power switching device).
Sourcing and Availability
This is an active, current-production Siemens SIRIUS contactor. Sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time.