The ZN73A-12 series permanent magnet high-voltage vacuum circuit breaker is an indoor switching device designed for three-phase AC 50Hz systems with a rated voltage of 12kV. Equipped with our self-developed permanent magnet operating mechanism, it serves industrial and mining enterprises, power plants, and substations for the control and protection of electrical facilities. This product features extremely high reliability and long service life, making it particularly suitable for harsh conditions such as frequent operation and multiple interruptions of short-circuit currents.