Siemens 5SY6104-6CC SENTRON MCB — 1P B-Curve, 6 kA
It is rated for 400 V AC (single-phase or multi-phase) and 230 V AC single-phase operation, with a frequency of 50/60 Hz. The DC rating is 72 V maximum. The unit occupies 1 modular width (18 mm) and is designed for quick assembly on a DIN rail, mountable in any position. The IP20 rating applies with connected conductors. This is a current-production part, actively sourced.
The 6 kA breaking capacity per EN 60898 tells you it can safely interrupt a fault current up to that level at 400 V AC; under UL 1077 / CSA C22.2 No. 235 the rating is 5 kA. The 10,000 mechanical operating cycles are typical for an MCB in a distribution board — not a switching device for frequent load cycling.
At 18 mm wide (1 MW), it fits standard 18 mm pitch distribution boards. The combined terminal at top and bottom accepts both busbar and conductor connections. Sealable design allows lockout/tagout.