The Siemens SIRIUS 3RT2025-1BB40-0CC0 is a Size S0 power contactor with a 24 V DC screw-type coil. It mounts on 35 mm DIN rail per DIN EN 60715 via screw or snap-on, so it drops into a standard panel without adapter plates. The 45 mm width and 85 mm height keep the footprint compact for multi-contactor assemblies.
Wiring and terminals
Main power terminals accept solid or stranded wire from 1 to 10 mm². Auxiliary terminals accept two conductors per clamp, from 0.5 to 2.5 mm². The screw-type coil connection is standard for the 24 V DC version — no cage-clamp or ring-tongue adapters needed.