What it is and what the ratings mean for fit
The Siemens 5SL3332-7MB is a SENTRON 3-pole miniature circuit breaker (MCB) with a C-trip curve, rated 32 A at 400 V AC. The C-curve means it trips between 5 and 10 times rated current — standard for mixed resistive and moderate inductive loads like lighting banks, small motor circuits, and general distribution in residential and infrastructure panels. The 4.5 kA breaking capacity per EN 60898 tells you the maximum fault current it can safely interrupt; for a 400 V AC sub-distribution board with a service entrance SCCR above that, you'd need an upstream limiting device. The 3 MW width (54 mm) snaps onto standard DIN rail and occupies three 18 mm modular slots.
Integration notes
Mounts in any position on standard 35 mm DIN rail. IP20 with connected conductors — suitable for enclosed distribution boards, not for wet or washdown areas. The sealable design lets panel builders lock the toggle position to prevent unauthorized operation after commissioning. Halogen-free and silicon-free construction matters for environments where outgassing during a fault could damage sensitive electronics. Mechanical life is 10,000 operating cycles typical — adequate for normal switching duty, but if the breaker cycles daily under load, factor that into your maintenance interval.