What It Is and Where It Fits
The Siemens 3RT2336-1NB30 is a SIRIUS contactor in the size S2 frame, designed for switching motor loads and resistive loads in industrial control panels. It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, making it a standard fit for most European-style enclosures. The coil accepts 20-33 V AC/DC. Inrush current peaks at 3 A.
Key Ratings and What They Mean for Your Panel
The auxiliary contact block (attachable up to 2 units) carries rated currents that vary by voltage: 10 A at 24 V AC, 10 A at 230 V AC, and 3 A at 400 V AC. For DC switching, it handles 2 A at 48 V, 6 A at 60 V, and 1 A at 110 V. These ratings define the maximum continuous current the auxiliary contacts can break — useful for signaling to a PLC or holding in a control relay. Operating temperature range is -40 to +70 °C, with storage from -55 to +80 °C. That covers most indoor industrial environments, including unheated warehouses and enclosures near ovens or chillers. Mechanical life is rated at 10,000,000 operations typical.
Mounting and Wiring Notes
The contactor accepts solid or stranded conductors: 2x 0.5-1.5 mm² and 2x 0.75-2.5 mm² per terminal. The screw-type terminals are straightforward for panel wiring — no special tooling needed beyond a standard screwdriver. Mounting position is flexible: +/-180° rotation on a vertical surface, and can be tilted forward/backward by +/-22.5°. Clearance requirements: 10 mm upward, 10 mm forward, 10 mm downward, and 6 mm at the side. That 6 mm side gap is tight — ensure adjacent devices or wiring ducts don't crowd the arc-chamber vents.