People Electric, in collaboration with Hebei University of Technology, has successfully completed the acceptance of its R&D project: Research on Key Technologies and Industrialization of Intelligent Miniature Full-Current Sensitive Residual Current Operated Circuit Breaker.
The project targets B+ type residual current protection technology. Our team solved core challenges including wide-band full-current detection, surge immunity and modular integration. Adopting voltage-type magnetic modulation measurement strategy combined with magnetic-modulated transformer, electromagnetic transformer and active compensation circuit, the device supports residual current detection from DC to 150kHz. It can accurately detect and protect 30mA fault leakage under 30A high-frequency leakage noise.
We built a nonlinear simulation model for residual current transformers, and developed algorithms to identify surge & short-circuit current with combined protection design. The product achieves surge immunity over 10kA. Prototypes remain stable without unwanted tripping or damage under 30kA lightning impulse current.
Equipped with STM32 digital control and fully domestic components, this RCD features rated current up to 80A and breaking capacity of 10kA. A smart cloud platform is integrated to enable remote monitoring and control.
This achievement demonstrates our R&D strength in smart low-voltage electrical appliances. The B+ residual current breaker is suitable for smart power distribution networks, EV charging stations, 5G base stations and data centers, delivering reliable leakage protection for high-end electrical applications.
Post time: Oct-30-2026
