The IP20 rating on the front with cover or box terminal means the live parts are finger-safe once the panel door is closed — standard for enclosed industrial gear. The terminal area itself is IP00, so keep the panel locked during operation.
That is the heavy-use rating; at 55 A it handles frequent reversals on a motor up to roughly 30 kW at 400 V without welding the main contacts. For standard across-the-line starting (AC-3), the contactor is sized for 37 kW at 500 V and 18.6 kW at 690 V. The 500 V figure covers most 480 V North American installations with headroom; the 690 V rating suits 600 V Canadian or 690 V European industrial networks. AC-2 duty (slip-ring motor starting) is rated at 30 kW at 400 V — a lower switching frequency than AC-3 because the rotor circuit sees higher making current.
Terminal wiring and panel integration
Main power terminals are screw-type, accepting 2x (10... 50 mm²) stranded or 2x (2.5... 16 mm²) solid/stranded. The control circuit (coil) terminals take 2x (0.25... 2.5 mm²) solid. Strip lengths and torque values follow standard Siemens practice for S3 frame — no special tooling needed. Dimensions are 146 mm high, 70 mm wide, 139 mm deep. The 70 mm width matches the S3 footprint; side-by-side mounting is permitted without derating for AC-3 duty, though AC-4 cycling may need a 10 mm gap depending on ambient. Check the thermal derating curve above 40 °C.
Lifecycle and compliance posture
RoHS compliance date is 05/01/2012, meaning it meets the EU RoHS directive for substances of concern. The pollution degree rating of 3 suits industrial environments with conductive pollution (condensation, light dust).