DC-rated MCB for industrial control circuits
The Siemens SENTRON 5SY5204-6CC is a 2-pole miniature circuit breaker rated 4 A with a B-curve tripping characteristic, designed specifically for 440 V DC circuits. Its 10 kA breaking capacity at 440 V DC (per IEC 60947-2) means it can safely interrupt a fault current up to that level without welding contacts or cascading failure upstream — critical for DC bus protection in drives, solar combiner boxes, or battery-backed control panels.
Snaps onto 35 mm DIN rail, occupies 2 modular width units (36 mm). Installation depth 70 mm. Rated IP20 with connected conductors. The sealable design allows panel builders to lock the toggle position with a lead seal after commissioning.