The Siemens 5SL3210-7CC is a SENTRON 5SL3 miniature circuit breaker — a 2-pole, C-curve device rated 10 A at 400 V AC with a 4.5 kA breaking capacity per EN 60898 and IEC 60947-2. Two poles in a 36 mm wide package (2 width units) fit standard DIN-rail distribution boards.
Width 36 mm (2 MW), height 90 mm. Mounting position any, so you can lay it sideways in a shallow gland plate if needed. IP20 with connected conductors; pollution degree 2 (non-conductive, occasional condensation).
Rated 400 V AC, multi-phase operation up to 440 V AC. At DC the maximum is 72 V. Overvoltage category III.