ZW8-12 outdoor high voltage vacuum circuit breaker

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Overview

The ZW8-12(G) series vacuum circuit breakers are high-voltage outdoor switchgear with a rated voltage of 12 kV and a three-phase AC 50 H2 rating. They are primarily used for interrupting and closing load currents, overload currents, and short-circuit currents in rural power grids, urban power grids, and small power systems. This product features a three-phase, shared-chamber design with vacuum interrupters housed within a metal enclosure. SMC insulation is used for phase-to-phase and ground insulation, ensuring reliable performance and high dielectric strength. The ZW8-12G combines a ZW8-12 circuit breaker with a disconnect switch, known as a combination circuit breaker. This series utilizes a CT23 spring-energy storage operating mechanism, available in both electric and manual versions. The circuit breaker features closing inrush current control, meeting control and measurement requirements.

Equipped with electronic control unit, it can realize "four remote" monitoring.

Model meaning

ZW8-12 outdoor high voltage vacuum circuit breaker

Main technical parameters

Project		Unit	ZW8-12(G)/630-6.3kA	ZW8-12(G)/630-12.5KA	ZW8-12(G)/630-20kA
Rated voltage		kV	12
Rated current		A	630
Rated short-circuit breaking current		kA	6.3	12.5	20
Rated short-circuit making current (peak value)		kA	16	31.5	50
Rated peak withstand current		kA	16	31.5	50
Rated short-time withstand current		kA	6.3	12.5	20
Rated insulation level	Lightning impulse withstand voltage (peak)	kV	75
Rated insulation level	1min power frequency withstand voltage	kV	42
Rated operating sequence			分-0.3s-合分-180s-合分
Mechanical life		次	10000
Rated short-circuit breaking current breaking times		次	30
Rated closing voltage of operating mechanism		V	110,220
Rated opening voltage of operating mechanism		V	110,220
Contact opening distance		mm	11±1
Overtravel (contact spring compression length)		mm	3±0.3
Three-phase opening and closing at different times		ms	≤2
Contact closing bounce time		ms	≤2
Average opening speed		m/s	1.0±0.2
Average closing speed		m/s	0.7±0.15
Opening time	At maximum operating voltage	ms	15-50
Opening time	At minimum operating voltage	ms	30-60
Closing time		ms	25-50
Main circuit resistance of each phase		mo	≤120(带G≤200)
Allowable cumulative wear thickness of moving and static contacts		mm	3
weight		kg	152(带G180)
Phase center distance		mm	175±1.5