Siemens 3RT1336-1AU00 — SIRIUS Size S2 Power Contactor
It is rated 11 kW at AC-2 duty at 400 V (50 Hz), which covers standard squirrel-cage motor starting and stopping — the AC-2 rating is the one that governs motor switching, not the higher AC-1 resistive figure. Side-by-side mounting is permitted, meaning you can gang multiple units without derating for heat buildup between them. The main circuit uses screw-type terminals accepting solid 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), max. 2x (0.75... 4 mm²) and stranded 2x (0.75... 25 mm²). The control circuit also uses screw terminals, so the same wiring tool works across all connections.
Dimensions: 112 mm height, 73 mm width, 115 mm depth. The 60 °C upper operating limit is typical for an IP20 panel-mounted device — no forced cooling required below that threshold. Arcing time at AC is 10 to 15 ms, which is fast enough to clear a fault without stressing upstream fuses or breakers. The recommended fuse for type 2 coordination is gL/gG 63 A. Mechanical life typical 10,000,000 operations. Maximum switching rate at AC-1 is 1,000 cycles per hour.