The Siemens 5SL6525-6BB is a SENTRON 5SL6 miniature circuit breaker (MCB) rated 25 A at 230 V AC with a B tripping characteristic and 1P+N pole configuration — switching both phase and neutral, with the neutral switched but not protected. It carries a 6 kA breaking capacity per EN 60898 and also per IEC 60947-2, so it safely interrupts fault currents up to that level in residential or light commercial distribution boards. The B curve trips between 3 and 5 times rated current, making it the standard choice for resistive and general-purpose loads where inrush is modest — lighting circuits, socket outlets, small appliances.
What the ratings mean for fit
At 25 A and 230 V AC, this MCB handles a nominal load of roughly 5.75 kVA on a single-phase circuit. The B characteristic means it will hold through a short motor start or capacitor charge but trip promptly on a hard fault — it is not suited for high-inrush loads like large transformers or motor drives (those need C or D curves). The 1P+N format saves one DIN width unit (36 mm total) compared to a 2-pole breaker, but note the neutral pole is switched only, not protected — the overcurrent protection is on the phase pole alone. Wire range accepts 0.75 to 25 mm² solid or stranded, and the screw terminals require 2.5 to 3 N·m torque — consistent with standard panel-building practice for this conductor size.
Panel integration notes
The MCB snaps onto a standard 35 mm DIN rail and occupies 2 width units (36 mm). Installation depth is 70 mm; total depth with the housing is 76 mm — enough clearance for a standard distribution board with a 100 mm back panel. Mounting position is any, so it can be installed horizontally or vertically without derating. IP20 with connected conductors means it is protected against finger contact but not against moisture — keep it inside a closed enclosure. Ambient temperature range is -25 to +45 °C, with periodic excursions to +55 °C and up to 95% humidity. The housing is halogen-free and silicon-free, which matters for environments sensitive to outgassing (e.g., clean rooms, medical facilities).