Residual Current Circuit Breaker(RCCB) provide personal safety and equipment protection for low-voltage power distribution systems. The core product is an electromagnetic residual current circuit breaker with a 2P-4P full-pole configuration, suitable for residential, commercial and industrial power distribution. Its core advantages lie in precise residual current protection, electromagnetic fast tripping and high-reliability safety design. The RCCB has a built-in zero-sequence current transformer, which monitors 0.03A-0.3A residual current in real time (in compliance with IEC 61008) and quickly cuts off the fault circuit within 0.1 second, effectively preventing electric shock and electrical fires. Key parameters include 6kA/10kA breaking capacity (AC 400V), 25A-100A rated current, -5℃ to +40℃ operating temperature range and IP20 protection level. The NRC7 series adopts a modular design and can be combined with MCB; the NRC9 series integrates overvoltage protection. The products are CE certified, compatible with international standards, and are widely used in residential, hotel and factory power distribution systems.