Siemens 3RT1336-1AU00 — SIRIUS Size S2 Power Contactor
The Siemens 3RT1336-1AU00 is a SIRIUS power contactor, size S2, designed for switching motor loads in industrial control panels. 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. Mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 50022, so it integrates directly into a standard panel enclosure without extra brackets. 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. Pollution degree 3 (industrial environment) and insulation voltage rated 690 V — this contactor is built for the dirty, humid conditions inside a typical panel near a production line.
Integration & Mounting
Dimensions: 112 mm height, 73 mm width, 115 mm depth. The 73 mm width is the key panel-space figure — it fits a standard 35 mm DIN rail footprint with room for adjacent devices. Operating temperature range -25 to +60 °C; storage -55 to +80 °C. 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.