AFCI circuit breaker

AFCI circuit breakers operate with highly sensitive arc fault detection circuitry designed to identify high-frequency electrical signatures associated with dangerous arc events. In real-world power distribution environments, these circuits are continuously exposed to lightning-induced surges, switching transients, electrostatic discharge and electromagnetic interference from connected loads. Without coordinated transient suppression, overvoltage stress can distort detection signals, trigger nuisance tripping or permanently damage control electronics.

By implementing a multi-layer protection architecture combining high-energy MOVs and gas discharge tubes at the power input stage with fast-response TVS diodes and ultra-low capacitance ESD protection on signal and control lines, AFCI systems achieve both robust surge immunity and stable arc fault sensing performance. This coordinated protection strategy significantly enhances system safety, reduces field failure rates and ensures long-term compliance with electrical safety standards in residential and industrial power distribution applications.