ZW20B-12(G) Outdoor High-Voltage AC Vacuum Circuit Breaker

Three-phase AC 50Hz outdoor high-voltage switchgear, used in the 10kV electrical power systems of rural power grid and urban power grid as opening and closing load current, overload current, and short circuit current, and in other similar applications.

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Catalog

ZW20B-12(G) Outdoor High-Voltage AC Vacuum Circuit Breaker Catalog.pdf

Certificate

Overview

Working environment conditions:

1.1 Ambient air temperature: Max. temperature: +45°C; Min. temperature: -40°C; Max. daily temperature difference: 25K;

1.2 Relative humidity: Daily mean is not greater than 95%, and monthly mean is not greater than 90%;

1.3 Altitude: Not exceed 2,000 meters;

1.4 Wind: Not exceed 35m/s (equivalent to air pressure 700Pa);

1.5 Pollution degree 4;

1.6 Radial thickness of ice: 10mm;

1.7 Earthquake resistance: horizontal acceleration: 0.3g/s2; vertical acceleration: 0.2g/s2;

1.8 Installed in places free of fire, explosion, chemical corrosion and frequent severe vibration. Please contact the manufacturer for customizing those failed to follow the normal working conditions.

Rated frequency			Hz	50
Rated insulation level	Power frequency withstand voltage for 1 minute	Dry test	kV	P/phase to phase, P/phase to earth: 42 O/open contacts: 48
		Wet test		34
	Lightning impulse withstand voltage (peak)			P/phase to phase, P/phase to earth: 75 O/open contacts: 85
Rated circuit-breaker breaking current			kA	20	25
Rated short-circuit making current (peak)			kA	50	63
Rated peak withstand current			kA	50	63
4s thermal stability current			kA	20	25
Rated operating sequence				O-0.3s-CO-180s-CO
Closing time			ms	≤50

Opening time				≤45
Rated short-circuit breaking current ON/			Times	30
OFF times
Mechanical life				10,000
Control circuit and auxiliary circuit, power frequency withstand voltage for 1 minute			V	2000

Rated operating voltage and auxiliary voltage				AC/DC220、DC110/48/24
Rated current of overcurrent trip coil			A	5
Allowable wear thickness of dynamic and static contacts in arc extinguish chamber			mm	3
SF6 gas pressure in box (gauge pressure)			MPa	0