40A 1 Pole B Curve 6KA MCB (NB1‑63B1P40)

The 40A 1 Pole B Curve 6KA MCB (Model NB1‑63B1P40) from CHINT is a high-quality, compact miniature circuit breaker designed to protect electrical circuits from overload and short-circuit faults. Built to trusted industrial standards, this single-pole MCB delivers reliable interruption performance and long-lasting service in domestic and commercial distribution systems.

Constructed with robust, durable materials and engineered for consistent performance, this MCB features a 40 ampere rating and a B-curve tripping characteristic, which means it is sensitive enough to protect standard lighting and general power circuits without nuisance tripping. The 6 kiloampere breaking capacity ensures dependable protection even under high fault conditions, making it an excellent choice for both new installations and upgrades.

Thanks to its single pole design, this breaker occupies only 18mm of DIN rail space, making it ideal for neat, space-efficient consumer units and distribution boards. Installation is straightforward on standard TH35 DIN rails, and the breaker is suitable for use in environments with operating temperatures from -5 °C to +40 °C.

Whether you are protecting lighting circuits, power outlets, or control panels, the NB1‑63B1P40 provides simple yet robust circuit protection that meets everyday electrical safety needs throughout homes, offices, and light commercial spaces.

40A 1 Pole B Curve 6KA MCB (NB1‑63B1P40) – Data Sheet