The 15 kW rating at 400 V in AC-2 duty (slip-ring motors) and 18.5 kW at 500 V in AC-3 duty (squirrel-cage motors) define the motor sizes this contactor handles — 15 kW for a 400 V slip-ring motor, 18.5 kW for a 500 V squirrel-cage motor. Mechanical life is 10 million operations typical, with maximum operating rates of 1 000 cycles/hour in AC-3 and 250 cycles/hour in AC-4 — the AC-4 limit governs jogging or inching applications where the contactor makes and breaks stalled-rotor current. The contactor carries IP20 on the front (finger-safe for panel builders) and IP00 at the terminals — meaning the wiring zone is unprotected, so it must sit inside an enclosure rated for the environment.
The screw-type terminals on the main circuit accept solid conductors from 2x 0.5 mm² up to max 2x 4 mm², and stranded from 2x 0.75 mm² up to 2x 25 mm². The control circuit terminals take solid 0.5–1.5 mm² and stranded up to 4 mm². Strip lengths and torque specs follow standard Siemens SIRIUS practice — no special tooling needed. Side-by-side mounting is permitted, so multiple contactors can pack tightly on the rail without derating gaps.