What it is and what the ratings mean
The Siemens 5SL6520-7CC is a SENTRON miniature circuit breaker (MCB) with a 1P+N pole design, meaning it switches both the phase and neutral but only the phase is protected against overcurrent. It's rated 20 A with a C tripping characteristic — the standard choice for general-purpose loads like lighting circuits, small motor starters, and socket outlets in residential and light commercial infrastructure. The 6 kA breaking capacity per EN 60898 is enough for most domestic and small commercial distribution boards where the prospective fault current stays under that threshold. It operates on a single-phase 230 V AC supply at 50/60 Hz.
Panel fit and integration
Occupies 2 modular width units (36 mm) on a DIN rail, with a depth of 76 mm and a standard 70 mm installation depth behind the panel. Mounting position is any, so it fits in vertical or horizontal distribution boards. IP20 with connected conductors — fine inside a closed panel, not for wet locations. Sealable design allows padlocking in the OFF position for lockout/tagout. Accepts supplementary devices (auxiliary contacts, shunt trips, alarm switches) for remote status or emergency shutdown integration.