The SENTRON 5SQ2370-0KA08 is a 3-pole miniature circuit breaker (MCB) in the 5SQ design series, rated 8 A with a C tripping characteristic and a 3 kA breaking capacity per EN 60898 at 400 V AC, 50 Hz. It switches both AC and DC circuits — the AC/DC voltage type means it can protect a DC control bus or an AC distribution feeder without a separate DC-rated breaker.
With a 55 mm installation depth and 3 width units (about 54 mm on a standard DIN rail), this breaker drops into a SENTRON distribution board or any 35 mm DIN-rail enclosure. Overvoltage category 3 suits fixed-installation distribution boards where the breaker sees transient overvoltages from the utility side.
What the approvals mean for compliance
The 3 kA breaking capacity is rated per EN 60898, the harmonized European standard for MCBs in household and similar installations. This breaker carries that rating, so it meets the minimum short-circuit performance expected in a 400 V distribution board. Overvoltage category 3 and energy limiting class 3 are both defined under IEC 60947-2 — the breaker coordinates with downstream equipment to limit thermal and magnetic stress during a fault.