The Siemens 5SY4505-7CC11 is a SENTRON miniature circuit breaker rated 0.5 A at 230 V AC with a C tripping characteristic, meaning it trips between 5 and 10 times rated current — so a 0.5 A C-curve holds through a 2.5 A to 5 A surge before opening. That's sized for protecting a control transformer primary, a small contactor coil circuit, or a signal-conditioning supply where a B-curve would nuisance-trip on inrush but a D-curve would let a sustained fault ride through too long. The 10 kA breaking capacity at 230 V AC per EN 60898 gives enough fault-clearing headroom for most industrial panelboards fed from a 16 A to 63 A upstream device. Two-pole 1P+N construction means the neutral pole switches with the phase — required when the neutral is not bonded to ground downstream, such as in a sub-distribution board or a railway auxiliary panel.
DIN-rail fit and conductor range — what bolts straight in
Width is 36 mm — two modular width units. Depth 76 mm, height 90 mm.
Environmental and compliance specs
Halogen-free and silicon-free construction. Ambient temperature range -40 to +70 °C operating, -40 to +75 °C storage. IP20 with connected conductors — finger-safe once wired. Overvoltage category III. Sealable — a lead seal can be fitted to prevent tampering. Designed for railway applications. Touch protection feature.