ZW8-12 Outdoor high voltage vacuum circuit breaker

Product Overview
The ZW8-12 outdoor high-voltage vacuum circuit-breaker is an outdoor power distribution device with a rated voltage of 12
kV and a three-phase AC frequency of 50 Hz. This circuit-breaker is primarily used to open and close the load current,
overload current and short-circuit current in power systems. It features overload, short-circuit and instantaneous protection, as
well as ground fault protection, with optional multiple reclosing, local remote control and remote communication functions.It is
suitable for use in substations and the power distribution systems of industrial and mining enterprises for protection and control
purposes.
In the event of a fault occurring within a user’s premises on a 12 kV distribution line with a T-type connection, or where the
fault occurs on the upstream side of the user’s feeder switch but the protection time delay is incompatible with that of the
substation’s feeder switch,this will result in the substation’s feeder switch tripping. If the fault is permanent and the
substation’s reclosing fails, a fault within a single medium-voltage user’s premiseswill cause a power outage along the entire
distribution feeder. Such cascading faults, which are common in power grids, can cause significant losses to society.
When the ZW8-12 outdoor high-voltage vacuum circuit breaker is installed at the point of responsibility demarcation on
overhead distribution lines, it will automatically isolate single-phase earth faults and phase-to-phase short-circuit faults
occurring upstream of the customer’s service entrance. This prevents faults within the customer’s premises from propagating to
the transmission trunk line, ensuring the safety of power supply to non-fers and enhancing the reliability of the power supply.

Main technical parameters