Siemens 3RT2518-1BM40 — SIRIUS Size S00 Contactor
The Siemens 3RT2518-1BM40 is a Size S00 contactor from the SIRIUS family, built for switching motor loads and resistive circuits in industrial control panels. It carries a 24 VDC coil with screw-type terminals for the main current circuit and magnet coil, and mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 50022. Rated for DC switching at 24 V (10 A), 48 V (2 A), 60 V (2 A), 110 V (1 A), 125 V (2 A), 220 V (0.3 A), 230 V (10 A), 400 V (3 A), 440 V (0.8 A), and 600 V (0.1 A). These ratings define the DC-1 and DC-3 load curves — useful for solenoid, brake, and DC motor loads where the arc extinction differs from AC. The contactor's footprint is 45 mm wide, 57.5 mm high, and 73 mm deep — a compact S00 frame that fits standard panel layouts. Side-by-side mounting is permitted with 6 mm spacing at the side; zero clearance allowed upwards, downwards, forwards, and backwards, giving flexibility in dense enclosures.
Mounting and Integration
Snap-on mounting onto 35 mm DIN rail per DIN EN 50022 is standard, with screw fixing as an alternative. The mounting position allows +/-180° rotation on a vertical surface and can be tilted forward/backward by +/-22.5° — useful when orienting the panel for cable entry or maintenance access. Terminals accept solid or stranded conductors: 2x (0.5...1.5 mm²), 2x (0.75...2.5 mm²), or 2x 4 mm². The screw-type clamp on both main and coil circuits means a standard Pozidriv bit handles the connection — no special tooling required for panel wiring.