Mounting and integration
The 3RT1025-1AR04: Mounts via screw or snap-on onto 35 mm standard rail per DIN EN 50022. The S0 frame is 45 mm wide, 85 mm tall, and 140 mm deep — a compact footprint for DIN-rail panels. Side-by-side mounting is allowed without derating, so you can pack multiple units on a rail for multi-motor groups. Main-circuit terminals are screw-type, accepting up to 2x 10 mm² stranded or 1x 8 AWG.
Duty ratings and coordination
For motor starting applications, the AC-2 rating of 7.5 kW at 400 V fits slip-ring motor loads. The AC-4 rating of 15.5 A at 400 V is the key figure for reversing or inching duty — the most demanding switching category for a contactor, where it must interrupt locked-rotor current. Type 1 coordination requires a 63 A gL/gG fuse; Type 2 coordination needs a 25 A gL/gG fuse. The contactor is rated for pollution degree 3, suitable for industrial environments.
Environmental and auxiliary ratings
Operates from -25 °C to +60 °C during operation, with a maximum altitude of 2 000 m. The front of the terminal is IP20 (finger-safe); the terminal itself is IP00 (open-terminal). Auxiliary contact ratings cover DC loads: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V, and 6 A at 230 V AC. Mechanical life is 10 million operations typical.