The Siemens 3RU5966-3AA01 is an overload relay adapter bracket accessory designed for the 3RU S10 and S12 frame sizes. It provides the mechanical interface to mount the overload relay onto the contactor, keeping the assembly compact on a DIN rail or screw-fixed panel backplate.
IP20 on the front means the bracket itself offers basic finger-safe touch protection per IEC 60529 — sufficient for enclosed panels where incidental contact during maintenance is the concern. The finger-safe rating applies for vertical contact from the front, so the assembly can be placed near the front of the enclosure without requiring additional shrouding on that face.