The Siemens 5SL6305-7 is a SENTRON miniature circuit breaker (MCB) rated 0.5 A on a C-curve, 3-pole, with a 6 kA breaking capacity per both EN 60898 and IEC 60947-2. This is the part for a 400 V AC three-phase branch circuit where the load draws half an amp — a control transformer primary, a small contactor coil supply, or a signal-conditioner feed.
DIN-rail fit and panel integration
The sealable option lets you lock the toggle position after commissioning to prevent tampering on a critical circuit.
If your panel's prospective short-circuit current exceeds 6 kA, step up to the 10 kA sibling 5SL4363-7 — same footprint, same curve, same poles, but rated 10 kA. The 0.5 A rating is unusual for a 3-pole MCB; most three-phase branches are 1 A or higher. It is sized for a low-current control circuit where a standard 1 A or 2 A breaker would not provide adequate overcurrent discrimination. Mechanical endurance is 10,000 cycles typical — fine for a branch circuit that sees infrequent operation; not rated for daily switching duty.
Overvoltage category III, pollution degree 2, suitable for residential and infrastructure applications per the manufacturer's suitability listing.