What it is and what it fits
The Siemens 3RT1476-6PP35 is a SIRIUS contactor in the S12 frame size, designed for switching motor loads and resistive loads in industrial control panels. The S12 frame is the largest in the SIRIUS contactor family, sized for high-current applications where the main power circuit needs 70 to 240 mm² stranded cable on the lugs. It measures 214 mm high by 180 mm wide by 225 mm deep, which means it needs a full-depth enclosure or a deep backpanel — not a shallow 200 mm box. The mounting is via screw fixing through 11 mm holes, and the contactor can be rotated ±90° on a vertical surface or tilted ±22.5° forward/back, giving panel builders some layout flexibility. The coil is rated for 200 to 277 V AC/DC. Pickup and dropout timing is 80 to 100 ms for both AC and DC supplies. Operating temperature range is -25 to +60 °C, which covers most indoor panel environments but not extended high-heat applications like furnace controls without derating. Storage range is -55 to +80 °C.
Auxiliary contact ratings — what they mean for your control circuit
This contactor includes an auxiliary switch block, and the breaking capacity varies significantly with voltage — something that catches people out when they reuse the same contactor across different control voltages. At 24 V it switches 10 A, but at 220 V that drops to 0.3 A. The 230 V rating jumps back to 6 A, which suggests that rating is for a different load type (likely AC resistive vs DC inductive). If you're switching a 220 VDC solenoid with this auxiliary, the 0.3 A limit is real — don't assume the 24 V rating scales. The mechanical endurance is rated at 10 million operations typical, which is standard for a power contactor of this size — not a high-cycle application part, but fine for normal motor starting duty.
Wiring and integration notes
Main power lugs accept 70 to 240 mm² stranded cable — that's heavy cable, typically 4/0 AWG to 500 kcmil equivalent. The auxiliary/coil terminals are screw-type, accepting solid or stranded from 0.5 to 4 mm² (roughly 20 to 12 AWG). Keep the control wiring separate from the power lugs to avoid noise coupling; the contactor itself is a noise source during switching. Clearance requirements: 10 mm upwards, 10 mm downwards, 10 mm at the sides, and 20 mm forwards. Plan your enclosure depth to account for the 225 mm body plus the 20 mm forward clearance.