SIRIUS S2 power contactor — 52 A at 480 V, spring-type coil terminals
The Siemens 3RT2036-3AP06 is a SIRIUS S2 power contactor rated for 52 A at 480 V, sized for motor switching in industrial control panels. Coil connection uses spring-type terminals, which cuts wiring time on the line — strip, push, done. No retorquing on thermal cycles. The main contact configuration is 18...1, meaning three normally-open power poles plus one auxiliary normally-open, all rated for the full AC-3 switching duty. Switching frequency limits vary by duty class: 1 000 ops/h at AC-1 (resistive), 800 ops/h at AC-3 (motor start/run), 600 ops/h at AC-2 (slip-ring motors), and 250 ops/h at AC-4 (plugging/inching). At AC-3e the limit matches AC-3 at 800 ops/h. Stay under these for coil life — the mechanical endurance is 10 million cycles typical, but contact wear accelerates above the rated frequency.
Panel fit and mounting flexibility
Dimensions: 75 mm wide, 114 mm tall, 130 mm deep. That 130 mm depth is the total body depth including terminals — measure your gland plate clearance before sliding it onto the rail. The width is a standard 75 mm, so it takes up three 25 mm module slots on the DIN rail. That 6 mm side gap is tight — adjacent devices can sit close, but leave the full 10 mm vertical for air circulation and arc-chamber venting.
Environmental and wiring specs
Wire capacity: 2x (0.5 to 2.5 mm²) solid or stranded. That's enough for the control wiring and main power tails on a 52 A device — use ferrules on stranded wire for the spring terminals to avoid frayed strands under the cage.