What it is and where it goes
The Siemens 5SL4501-7 is a SENTRON miniature circuit breaker (MCB) with a 1P+N pole design — it switches the phase and monitors the neutral, but does not switch the neutral. Rated 1 A at 230 V AC with a C tripping characteristic, it breaks fault currents up to 10 kA per EN 60898 and IEC 60947-2. That 10 kA SCCR means it can safely interrupt a short-circuit up to that level without welding the contacts or cascading the fault upstream — critical for selectivity in a distribution board. It occupies 2 modular width units (36 mm) on a DIN rail and is rated IP20 with conductors connected, so it lives inside an enclosure, not on a washdown line.
What the ratings mean for fit
The C-curve means the magnetic trip operates at 5 to 10 times the rated current — so for a 1 A breaker, the instantaneous trip point is between 5 A and 10 A. That suits lighting, control transformers, and small motor loads with moderate inrush. The 10 kA breaking capacity at 230 V AC is standard for residential and light commercial distribution boards. Temperature derating is baked in: at 40 °C ambient the breaker carries 0.95 A, at 55 °C it drops to 0.86 A — so if the panel runs hot, size up one step. Power loss per pole is 1.2 W at rated current; in a crowded enclosure with several breakers, that heat adds up and affects the derating curve.
Panel integration notes
Mounts in any position on a 35 mm DIN rail. Depth is 76 mm overall; installation depth (behind the panel face) is 70 mm. The housing is halogen-free and silicon-free — relevant if the panel is in a clean room or a zone where outgassing matters. Sealable with a lockable cover or padlock accessory to prevent unauthorized switching. Supplementary devices (auxiliary contacts, shunt trips, alarm switches) can be added on the right side without extra wiring space.