It is designed for switching motor loads in control panels and industrial machinery, rated for 5.5 kW at 400 V in AC-3 duty and 12.5 A in AC-4 duty at the same voltage.
Front-side protection is IP20, meaning the contactor is touch-safe from the front once installed in an enclosure. The terminal area itself is rated IP00, so the wiring compartment requires the panel door or additional guarding to meet IP2X requirements.
Main current circuit terminals are screw-type, accepting solid or stranded conductors: 2x (0.25 to 2.5 mm²), 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), or a single conductor up to 10 mm². AWG equivalents are 2x (16 to 12), 2x (14 to 10), and 1x 8. This range covers most motor and feeder wiring in control panels. The auxiliary contact block (not included) can be added on the side; the contactor has no built-in auxiliary contacts.
For short-circuit protection, the required fuse size depends on coordination type: 25 A gL/gG for Type 2 coordination, 63 A gL/gG for Type 1.
Sourcing posture
This is a current-production Siemens SIRIUS contactor. For BOM-line commitment, the key fit parameters are the S0 frame size, 24 V DC coil, 3-pole NO main contacts, and screw terminals. The AC-3 motor rating at 400 V (5.5 kW) and AC-4 current (12.5 A) define the load it can switch.