ZW□ Q-12 series outdoor dual power supply automatic switching vacuum circuit breaker, when the common power supply fails, the switching device can complete the automatic switching with the equipment power supply to ensure reliability and safety. It can also select and switch between two power sources according to the needs of the load. The product has overload and short-circuit protection functions and an interlock design. It is especially suitable for important places where power interruption is not allowed. As an important electrical control device to ensure continuous power supply, it is a self-injection and self-recovery dual-circuit power automatic switching device matched with a high-voltage vacuum circuit breaker. It is a new generation of dual power supply automatic switching products with novel design, perfect performance, safety and reliability, high degree of automation and wide application range. The products are widely used in 10KV power distribution lines in oil fields and mines, and 10KV lines in industrial and mining industries.