Advanced Type B Breaker Delivers Unmatched Electrical Fault Protection

The JCRD4-125 Type B Breaker represents a critical advancement in electrical safety technology, engineered to instantly disconnect circuits upon detecting hazardous leakage currents exceeding 30mA. As a Residual Current Circuit Breaker (RCCB) meeting stringent IEC 61008 and IEC 62423 standards, this device provides superior personal protection against electric shock in commercial and industrial installations. Its Type B classification ensures comprehensive detection of all residual current forms – including smooth DC, pulsating DC, and AC – making it essential for modern electrical environments with photovoltaic systems, EV chargers, and variable-speed drives.  

Precision-engineered for reliability, the JCRD4-125 features a 125A rated current capacity with instantaneous tripping response within 300 milliseconds. The device incorporates advanced electromagnetic tripping technology that functions independently of mains voltage, ensuring fail-safe operation even during voltage drops. Robust construction includes silver-nickel contacts for arc resistance, dual-terminal connections for secure wiring, and a clear visual trip indicator. These design elements collectively achieve an exceptional 10,000 electrical endurance cycles, minimizing maintenance requirements.  

What distinguishes this Type B Breaker is its sophisticated residual current monitoring. Utilizing a high-sensitivity toroidal core transformer, it detects leakage currents as low as 6mA while remaining immune to transient voltage surges up to 4kV. The integrated microcontroller analyzes waveform characteristics to differentiate between actual fault currents and nuisance signals, preventing false tripping. This intelligent discrimination capability makes it suitable for sensitive medical facilities, data centers, and manufacturing plants where operational continuity is paramount.  

Installation flexibility is achieved through DIN-rail mounting compatibility and compact modular design (90mm width). The device supports both single-phase and three-phase configurations up to 400V AC systems. Environmental resilience includes operation from -25°C to +60°C with IP20 protection, while the test button enables regular safety verification. Compatibility with Type AC and Type A RCCBs allows seamless integration into existing electrical panels for comprehensive protection layering.  

The JCRD4-125 Type B Breaker establishes new benchmarks in electrical safety infrastructure. By combining universal fault detection, intelligent discrimination algorithms, and robust construction, it delivers uncompromising protection where lesser devices may fail. For engineers specifying critical power systems, this advanced RCCB provides certified defense against evolving electrical hazards in the era of renewable energy and electronic equipment proliferation.