1. General:
VW1-12 mid-voltage embedded poles circuit breaker is applicable for three-phase AC power system of rated voltage up to 7.2Kv~12Kv and frequency 50Hz，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 KYN28 or KYN96.This circuit breaker is standards as GB1984 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 IEC62271-100.
This circuit breaker is made with mature APG technology. The application of VW1 terminal buffer guarantees the solid encapsulated terminal is ever more reliable in nay operation environment. VW1 can fully meet the requirement of GB, DL, IEC, DIN, VDE as well as standards of other advanced industrial countries.

2.Service Environment
Altitude:1000m and below;
Environmental temperature is from:-15~40°C;
Environmental humidity:
Daily average of relative humidity≤95%
Daily average saturated vapor pressure≤2.2×10-3Mpa
Monthly average of relative humidity≤90%
Monthly average saturated vapor pressure≤1.8×10-3Mpa
No operating in such environment as subject to dust, dirt, smog, corrosive/flammable gas, vapor and salt pollution. Earthquake intensity: No more than 8 degree.
The circuit breaker should be operated in the normal service condition. If there is any difference between actual service condition and normal service condition, for example, the altitude of installed place is above 1000m, the value of ambient air temperature exceed specified limit or the place with high humidity where easy to course moist, it should be conformed by the manufacturer.