NDB2ZB-63

The NDB2ZB-63 series miniature circuit breaker features three-stage protection: overload long-time delay, short-circuit short-time delay, and short-circuit instantaneous tripping. Designed for DC distribution systems with a rated operating current up to 63A, it enables full selective coordination with downstream circuit breakers. This ensures reliable short-circuit fault protection while effectively preventing nuisance tripping of upstream breakers caused by downstream fault currents, thereby guaranteeing system safety and reliability. It also provides isolation functionality.