What it is and what it does
The Siemens 3RT1034-1AV60 is a SIRIUS power contactor in size S2, built for switching motor loads in industrial control panels. It fastens onto a 35 mm DIN rail per EN 50022 with either screws or a snap-on clip, and the main circuit uses screw-type terminals. Rated motor power: 18.5 kW at 500 V (60 Hz) and 10 kW at 690 V (60 Hz), and 15 kW at 400 V under AC-2 duty. That covers standard three-phase induction motors on 400 V, 480 V, and 690 V grids. Auxiliary contacts handle 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V — enough for control-circuit interlocking or status feedback. The coil hold-in range is 0.8 to 1.1 times rated voltage at 60 Hz, with an arcing time of 10 to 15 ms.
Mounting and wiring fit
The contactor is 55 mm wide and 115 mm deep, with a height of 112 mm. It mounts side-by-side without derating (side-by-side mounting is permitted). The screw terminals accept solid wire up to 2x 4 mm² (max) or stranded up to 2x 25 mm². For a panel builder, that means you can land a 16 mm² stranded cable on the main circuit and still have room for auxiliary wiring. Degree of pollution 3 means it's rated for industrial environments with conductive dust or occasional condensation — no extra conformal coating needed in most panel builds.