DC-rated 4-pole MCB for infrastructure and residential panels
The Siemens SENTRON 5SL5432-7RC is a 4-pole miniature circuit breaker with C-curve tripping characteristic, rated 32 A at 30 °C and derated to 25.9 A at 60 °C. It is designed for DC circuits up to 880 V maximum, with a breaking capacity of 10 kA per the description. The 4-pole design (4 modular width units at 72 mm wide) suits three-phase-plus-neutral DC distribution in residential and infrastructure panels, where the C-curve handles moderate inrush from lighting and small motor loads without nuisance tripping.
Current derating and thermal behavior
Rated current drops from 32 A at 30 °C to 30.1 A at 40 °C, 29.1 A at 45 °C, 28.5 A at 50 °C, 27.2 A at 55 °C, and 25.9 A at 60 °C. The 3.5 W power loss per pole at rated current in hot operating state means the breaker self-heats about 14 W total in a 4-pole assembly — factor that into enclosure thermal calculations, especially when ganged with other breakers in a crowded DIN-rail panel.
Mounting and integration
Mounts on standard DIN rail in any position. Installation depth is 70 mm behind the panel; overall depth is 76 mm. The 72 mm width (4 MW units) and 90 mm height fit standard SENTRON enclosures. IP20 with connected conductors — suitable for enclosed distribution boards, not for wet or washdown locations. Pollution degree 2 and overvoltage category II cover normal residential and commercial environments. Sealable for tamper-proofing in metered or shared-access panels. Halogen-free and silicon-free construction matters for life-safety and sensitive equipment zones.