SIRIUS S12 Contactor — 72 V DC Coil, 192 A at 600 V
The Siemens 3RT1476-2XJ46-0LA2 is a SIRIUS S12 frame contactor with a 72 V DC coil, rated for 192 A at 600 V AC-1 and 180 A at 480 V AC-1 — those are the resistive load curves, so it handles heater banks, lighting, or transformer primary switching at those currents. The S12 frame size (214 mm high, 160 mm wide, 225 mm deep) is a panel-mount unit using screw fixing through an 11 mm hole; it's not a DIN-rail snap-on, so plan for four bolts and a backplate. The DC coil pulls in at 0.7 of rated voltage and drops out with a delay of 80 to 100 ms after power is removed — that dropout delay matters for sequencing in safety circuits where you want a controlled off-sequence rather than an instant drop. Arcing time runs 10 to 15 ms, which is typical for a DC-switched contactor of this size. Mounting position is flexible: vertical surface with +/-90° rotation and +/-22.5° tilt front-to-back. Clearance requirements are modest — 10 mm upwards, 20 mm forwards, 10 mm downwards, 10 mm at the side — so it fits in a standard 600 mm deep enclosure with room for wiring ducts.
Auxiliary Contact Ratings and Switching Capacity
This contactor carries an integrated auxiliary switch, rated for 6 A at 24 V DC and 6 A at 230 V AC. The DC auxiliary curve drops to 2 A at 48 V and 60 V, then 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, 3 A at 400 V, and 2 A at 500 V. That's a steep derating as voltage climbs — if you're switching a 125 V DC pilot light, you're limited to 0.9 A, so check the load against the curve before wiring. Maximum switching frequency is 600 operations per hour under AC-1 duty and 250 ops/h under DC-1. Mechanical life is rated at 10 million cycles typical, so for a conveyor line cycling once every 6 seconds, that's roughly 17,000 hours before mechanical wear becomes a consideration.
Environmental Range and Wiring
Operating temperature spans -40 to +70 °C, storage from -55 to +80 °C. That covers most indoor industrial environments and unheated warehouses. The main power terminals accept 2x (0.25 to 2.5 mm²) solid or stranded wire — spring-cage or screw terminals aren't specified here, so confirm the termination style from the full datasheet before panel wiring.