The Siemens SIRIUS 3RT1025-1BF44 is a size S0 power contactor rated for 7.5 kW at AC-2 duty on a 400 V supply, with a 110 VDC coil. Front-side protection is IP20, which is standard for enclosed panel mounting; the terminals themselves carry an IP00 rating, meaning the wiring compartment expects to be inside a cabinet or shrouded.
Side-by-side mounting is permitted with zero clearance — the 6 mm side spacing is the minimum for heat dissipation, not a mandatory gap. The S0 frame keeps the height at 85 mm and depth at 150 mm, so it fits most 200 mm deep enclosures without crowding the door. Main circuit terminals accept screw-type connections: solid conductors up to 2x 4 mm², stranded up to 2x 6 mm², or a single 10 mm². Auxiliary contacts (2 N.O. instantaneous) use the smaller 0.5–2.5 mm² range. For North American builds, the AWG equivalents are 2x 16–12 for the aux and 2x 14–10 for the mains, with a single 8 AWG allowed.
The pollution degree is 3, so it's rated for conductive environments typical of industrial panels — no additional conformal coating needed for normal factory floor conditions.