This is a Siemens SIRIUS power contactor, order code 3RT1076-6AB36, in the Size S12 frame. It's a screw-fixed unit with a 23-26 V DC-rated magnet coil terminated to screw-type terminals. The contactor carries an auxiliary switch block, so you get one less add-on to order when building a motor starter. Rated for AC-3 duty at 420 operating cycles per hour, this contactor handles motor switching in conveyors, pumps, and fan starters inside a control panel. The AC-1 resistive rating sits at 500 ops/h, and AC-4 (inching/plugging) at 130 ops/h — that 130 figure is the one to watch if you're reversing or jogging a load repeatedly. Mechanical life is typical 10,000,000 operations, so it's a fit-and-forget part for most medium-duty lines.
Mounting and wiring reality
Mounting position is flexible: vertical surface, rotatable +/-90°, or tiltable +/-22.5° front to back. That buys you options when the backpanel is already crowded. Fastening is screw fixing — four 11 mm holes on a 214 x 160 x 225 mm (H x W x D) footprint. No DIN-rail clip on this frame; you'll need a drill and M8 or similar hardware. That's tighter than some older contactor families — check your existing enclosure depth before committing the BOM line. Power wiring takes stranded cable from 70 to 240 mm² — substantial lugs, so plan for a crimping tool that handles that range. The auxiliary/control wiring accepts solid or stranded 0.5 to 4 mm², with screw terminals.
Coil and switching performance
Coil pick-up and drop-out times are 60-100 ms on both AC and DC supplies. Arcing time is 10-15 ms. The coil's rated operating range is 23-26 V, with a pick-up threshold of 0.8 x rated and a drop-out of 0.9 x rated at both 50 and 60 Hz. That means it holds in down to about 20.7 V and drops out reliably around 23.4 V — tight, so a sagging DC bus could drop it out before a drive faults. Auxiliary contact ratings: 10 A at 24 V, 2 A at 48 V, 2 A at 60 V, 1 A at 110 V. That's enough for a PLC input or a small relay coil, but not for direct solenoid drive at the higher voltages.