Chint 20A B Curve RCBO 30mA 1 Pole + Neutral

The CHINT NB1L-B20 is a compact and reliable Residual Current Circuit Breaker with Overcurrent Protection (RCBO) designed to provide dual-layer electrical safety by combining the functions of an MCB (Miniature Circuit Breaker) and an RCD (Residual Current Device) in a single modular unit. It is engineered to protect electrical installations from overload, short-circuit faults, and earth leakage currents, ensuring enhanced safety for both people and equipment.

Part of CHINT’s widely used NB1L series, the B20 variant (20A rating) is ideal for standard final circuits such as lighting, socket outlets, and light-duty appliances in residential, commercial, and small industrial environments. Its compact design allows for efficient use of space in distribution boards, making it especially suitable for modern consumer units where DIN rail space is limited.

The device features a Type B tripping curve, which provides fast disconnection for circuits with low inrush current, making it well-suited for general-purpose electrical loads. With a typical 30mA residual current sensitivity, it offers additional protection against electric shock and significantly reduces the risk of electrical fire caused by leakage currents.

Designed according to international safety standards (IEC 61009-1), the NB1L-B20 ensures dependable performance and long service life even under demanding operating conditions. Its thermo-magnetic release mechanism enables precise fault detection and rapid interruption of faulty circuits.