What it is and what the ratings mean
The Siemens 5SL4232-8 is a SENTRON miniature circuit breaker — 2-pole, D-curve, rated 32 A at 400 V AC. The D tripping characteristic means it tolerates high inrush currents (5–10× rated current), so it's the right choice for motor loads, transformers, or welding equipment where the start-up surge would nuisance-trip a C-curve breaker. Breaking capacity is 10 kA under both EN 60898 and IEC 60947-2, which covers most distribution panels in residential and light commercial infrastructure. At 2 modular width units (36 mm), it fits standard DIN-rail enclosures.
Panel fit and integration
Mounts in any position on DIN rail, with an installation depth of 70 mm and overall depth of 76 mm. The 2-pole footprint takes up 2 modular width units (36 mm). IP20 with connected conductors — suitable for enclosed distribution boards, not for wet or outdoor locations. Sealable, halogen-free, and silicon-free construction. Accepts supplementary devices (auxiliary switches, shunt trips, undervoltage releases) for expanded functionality.
Electrical specs at a glance
Rated for 400 V AC, 50/60 Hz, with a maximum operating voltage of 440 V AC in multi-phase operation. DC rating caps at 72 V. Power loss per pole is 2.7 W in hot operating state at rated current. Mechanical service life is 10,000 operating cycles typical. Overvoltage category III, pollution degree 2, energy limitation class 3.