Rated coil voltage is 380-420 VAC, with a pickup threshold of 0.8 x rated value and a dropout below the 1.1 x full-scale hold level — typical for directly controlled AC coils in MCC buckets or panel-mounted contactor assemblies. Mounting is via screw fixing with four 11 mm holes on a 160 x 214 mm footprint, 225 mm deep.
Rated for AC-3 duty (squirrel-cage motor switching) at up to 750 operations per hour, and AC-4 (inching/plugging) at 250 ops/h. AC-1 resistive load switching tops out at 700 ops/h. These figures tell you the thermal capacity of the contactor under repeated make-break cycles — AC-3 is the normal running duty, AC-4 is the severe case that generates more arc energy. That's fast enough for most motor-starting sequences but worth noting if you're coordinating with upstream short-circuit protection devices. Auxiliary contact ratings: 10 A at 24 V, 2 A at 48 V or 60 V, and 1 A at 110 V — sufficient for signaling back to a PLC input module or holding in a control relay.
Wiring and environmental limits
Main power terminals accept stranded cable from 70 to 240 mm² — sized for the full rated current of an S12 frame. Auxiliary and coil connections use screw-type terminals accepting 2x 0.5-1.5 mm² solid or 2x 0.75-2.5 mm² stranded, with a max of 2x 4 mm² per clamp. These are minimum air gaps for arc flash and heat dissipation — don't crowd the contactor against cable ducts or panel walls.
The 3RT1275-6AV36 is in a current lifecycle stage, meaning Siemens continues to manufacture and support this order code. No phase-out or last-time-buy has been announced. Typical mechanical endurance for this contactor size is 10 million operations — a solid figure for high-cycle applications like conveyor systems or pump stations.