The Siemens 3RT1476-6AU36 is a SIRIUS S12 contactor — the frame size that bridges the gap between the S10 and the larger S3 builds. The S12 footprint — 214 mm high, 160 mm wide, 225 mm deep — is sized for a 400 V motor branch that needs more than the S10 can deliver but doesn't justify the jump to the S3 panel cutout.
The coil is rated 240-277 V, AC/DC type, with a pickup threshold of 0.8 × rated value and a dropout below that. Arcing time runs 10-15 ms, and the opening times at both AC and DC fall in the 60-100 ms window — consistent for a contactor this size driving an inductive load. The auxiliary contacts are rated for switching: 10 A at 24 V, 6 A at 230 V, and derated down to 0.3 A at 220 V DC. That auxiliary set is what you'd use to signal a PLC input or seal in a holding circuit; verify the DC switching curve if you're breaking an inductive DC load at the higher voltage end.
Termination reality for the power circuit
The main power terminals accept stranded cable from 70 mm² up to 240 mm² — that's a serious conductor, consistent with the S12 frame's current rating. The auxiliary and coil terminals take solid or stranded wire: 2 × (0.5-1.5 mm²), 2 × (0.75-2.5 mm²), or max 2 × (0.75-4 mm²). Fastening is screw fixing, with a single 11 mm hole for mounting.
The 3RT1476-6AU36 is listed at the current lifecycle stage — no phase-out notice, no NRND flag. That means it's still a valid BOM line for new builds and spares.