20A 1 Pole B Curve 6KA MCB (NB1‑63B1P20)

The 20A 1 Pole B Curve 6KA MCB (NB1‑63B1P20) is a reliable miniature circuit breaker from CHINT’s NB1‑63 series, designed to safeguard domestic and commercial electrical circuits. Built to deliver dependable overload and short-circuit protection, this MCB is ideal for new installations or upgrades in consumer units, distribution boards and control panels.

Constructed with a robust plastic enclosure, this single-pole breaker fits neatly on a standard TH35 DIN rail and occupies just one modular width (18 mm), making it perfect for modern compact electrical setups. It is rated for 20 amps continuous current and features a B-curve tripping characteristic, which means it responds quickly to slight overloads typical in lighting circuits and general power outlets without unnecessary nuisance trips.

With a 6 kA breaking capacity, this MCB can interrupt fault currents up to 6000 amps, delivering high-level protection against fault conditions while maintaining safety compliance for standard UK 230 V AC systems. The thermal-magnetic mechanism ensures consistent performance across a wide range of temperatures, while the clear on/off indication makes operation intuitive even for homeowners or DIY electrics enthusiasts.

Installation is straightforward thanks to top and bottom feed terminals that accommodate cable sizes suitable for typical ring or radial circuits, and the compact dimensions help retain valuable space within your consumer unit. Whether you are wiring new circuits, replacing an old breaker, or specifying components for a professional electrical project, the NB1‑63B1P20 delivers effective circuit protection you can trust.

20A 1 Pole B Curve 6KA MCB (NB1‑63B1P20) – Data Sheet