SIRIUS Size S6 Power Contactor — 42-48 V Coil
The Siemens 3RT1054-2AD36 is a SIRIUS power contactor in the Size S6 frame, designed for switching motor and resistive loads in industrial control panels. The coil is rated for 42-48 V (VAC or VDC), making it suitable for control circuits operating in that voltage band — common in 48 VDC auxiliary supplies or 42 VAC step-down transformer feeds. Switching capacity at 24 V rated value is 10 A, at 48 V it drops to 2 A, and at 110 V it handles 1 A, so the auxiliary contacts are sized for signal-level loads, not main power. The contactor mounts via screw fixing on a vertical surface, rotatable ±90° and tiltable ±22.5° front-to-back, which covers most panel layouts without special brackets.
Duty Cycles and Switching Frequency
Rated switching frequency varies by duty class: AC-1 (resistive loads) allows up to 800 operations per hour, AC-3 (squirrel-cage motor starting) permits 1000 ops/h, AC-4 (plugging/inching) limits to 130 ops/h. The AC-3e rating matches the AC-3 figure at 1000 ops/h. For high-cycle applications like conveyor indexing or frequent reversing, the AC-4 ceiling is the binding constraint — plan around 130 cycles per hour maximum for heavy inching duty.
Termination and Wiring
Main power circuit accepts stranded conductors from 25 to 120 mm² — substantial cross-section for the Size S6 current rating. The magnet coil uses spring-type terminals, accepting solid or stranded wire 2x (0.25 to 2.5 mm²). Auxiliary switch wiring shares the same 2x (0.25 to 2.5 mm²) spring-cage range. The single 9 mm mounting hole per fixing point is standard for this frame class. Dimensions: 172 mm height, 120 mm width, 170 mm depth. Clearance requirements: 10 mm upwards, 20 mm forwards, 10 mm downwards, 10 mm at the side — factor these into enclosure sizing.
Environmental and Operating Range
Operating ambient temperature spans -25 to +60 °C; storage range is -55 to +80 °C. The arcing time is 10 to 15 ms, and mechanical operating life is rated at 10 million cycles typical for the contactor itself.
Lifecycle and Sourcing
The 3RT1054-2AD36 carries a current-production lifecycle stage. Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time.