The Siemens SENTRON 5SY4205-7CC is a 2-pole miniature circuit breaker with a C tripping characteristic, rated at 0.5 A for 400 V AC circuits. For UL 489 or CSA C22.2 No. 235 jurisdictions, the interrupting rating is 5 kA — a common derating for North American branch-circuit applications. The 0.5 A rating is unusual for a 2-pole MCB; it is sized for lightly loaded control circuits, instrumentation supplies, or small transformer primaries where a standard 1 A or higher breaker would not provide adequate overcurrent protection.
At 36 mm wide (2 width units), it occupies two adjacent 18 mm slots in a standard distribution board. Terminal capacity accepts solid or stranded conductors from 0.75 mm² up to 35 mm², with a tightening torque of 2.5 to 3.5 N·m on the screw terminals. The IP20 rating applies only with connected conductors; the terminals are touch-protected per the product feature listing.
Overvoltage category III and energy limiting class 3 indicate it is designed for fixed-installation distribution boards, not for plug-in equipment.