VB4/S medium-voltage indoor vacuum circuit breaker is applicable for three-phase AC power
system of rated voltage up to 7.2kV~24kV and frequency 50/60HZ,widely used in many fields
such as power plant, transformer substation, petrol chemical industry, metallurgy,
manufacturing industry, airport, residential area, etc., to control and protect the electric
equipment, especially, It is used for the occasion that needs infrequent operation at rated
current or multi-breaking short circuit current, may be mounted in the indoor air insulating
switchgear like type HXGN ring main uint series, etc. This circuit breaker is standards as
GB1984-2003 AC high voltage circuit breaker,JB3855 3.6-40.5Kv indoor AC High voltage
circuit breaker,DL/T403 Specification of 12-40.5Kv indoor High voltage vacuum circuit breaker
for order as well as IEC60694.
This circuit breaker is made with mature APG technology. The application of VB4/S terminal
buffer guarantees the indoor terminal is ever more reliable in nay operation environment.
VB4/S can fully meet the requirement of GB, DL, IEC, DIN, VDE as well as standards of other
advanced industrial countries.
a) Air temperature: Maximum temperature: +40ºC; Minimum temperature:-25ºC
b) Humidity: Monthly average humidity 95%; Daily average humidity 90% .
c) Altitude above sea level: Maximum installation altitude: 2500m
d) Ambient air not apparently polluted by corrosive and flammable gas, vapor etc.
e) No frequent violent shake
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