Zw32P-12 Series outdoor prepaid & metering vacuum circuit breaker is a 3-phase AC, 50, 60 Hz, rated voltage of 12 KV outdoor vacuum circuit breaker, having metering function to be a integrated switching unit. Equipped with 3-phase multi-function meter the unit realizes switching off or closing load current, overload current and short-circuit current of distribution system. As a high-precision medium-voltage metering device, it also has multi-function display that are displaying active power, reactive power, active demand, power factors, prepaid amount, rate of payment, all measurement, settlement, accounting functions. Having used International standard IC card and RS485 interface, infrared communication, large screen LCD display and many other advanced technologies, it can flexibly pre-set a variety of functions, such as overload alarm and automatic power off, phase missing alarm, recording, automatic meter reading. This function can be make use of IC card or laptop computer as a medium to exchange information transmission between user and compute of power supply department. The power sector can choose one or more transmission modes according to local specific conditions. It is convenient for the electric power department to realize computer network management, so as to meet the requirement of effective and timely modern management for users.