ZW20-12F (M) outdoor high voltage intelligent (permanent magnet) vacuum circuit breaker

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Overview

The ZW20-12F(M) outdoor high-voltage intelligent (permanent magnet) vacuum circuit breaker is an outdoor high-voltage switchgear with a rated voltage of 12kV and a three-phase AC frequency of 50/60Hz. It is mainly used for breaking and closing load current, overload current, and short-circuit current in power systems.

Suitable for protection and control in substations, industrial and mining enterprises, and urban and rural power distribution networks, especially suitable for locations with frequent operations and urban power distribution automation networks. This product, when used with a controller, meets the requirements of power distribution automation systems and reliably and effectively performs the functions of a traditional recloser. It adopts a mature box-type sealed structure with excellent sealing performance, making it unaffected by external environmental factors and a maintenance-free product. Its spring-operated or permanent magnet operating mechanism offers high reliability, making it an excellent choice for pole-mounted circuit breakers.

Model Meaning

ZW20-12F (M) outdoor high voltage intelligent (permanent magnet) vacuum circuit breaker

Features

◆Miniaturized design;

◆The box has an inverted structure, is fully sealed, has a simple sealing effect, and a high level of dirt resistance;

◆The transmission method is novel, simple, and reliable;

◆The main components are sealed inside the enclosure, achieving true maintenance-free operation;

◆Voltage transformers and disconnect switches can be installed externally.

Usage conditions

◆Ambient temperature: not exceeding 40℃; average daily temperature not exceeding 35℃; minimum ambient air temperature -25℃;

◆Relative humidity: daily average not exceeding 95%, monthly average not exceeding 90%; water vapor pressure: daily average not exceeding 2.2 kPa, monthly average not exceeding 1.8 kPa;

◆Altitude: Not exceeding 2000m;

◆The surrounding area is not significantly contaminated by dust, smoke, corrosive and/or flammable gases, vapors, or salt spray;

◆Vibrations or ground movements from outside the switching and control equipment are negligible;

◆The amplitude of induced electromagnetic interference in the secondary system shall not exceed 1.6kV.

Main technical parameters

Main technical parameters of circuit breakers

Project		Unit	Parameter
Rated voltage		kV	12
Rated current		A	630、1250
Rated frequency		HZ	50/60
Power frequency withstand voltage (1 min)	Dry type (phase-to-phase, ground-to-ground/break)	kV	42/48
	Wet test (to ground, external insulation)		34
Lightning impulse withstand current (peak value) (phase-to-phase, to ground/break)		kV	75/85
Rated short-circuit breaking current		kA	20	25
Rated short-circuit making current (peak value)		kA	50	63
Rated peak withstand current		kA	50	63
4S Short-Time Withstand Current		kA	50	25
Rated operating cycle			Score – 0.3s – Score – 180s – Score
Rated short-circuit current breaking times		次 Times	30
Mechanical life		次 Times	10000
Secondary circuit 1min power frequency withstand voltage		kV	2