ZKBD-630/12-20 type vacuum switch tubeDetailed product description：

purpose
The ZKBD vacuum switch tube uses oxidized glass as the insulating shell and high vacuum as the medium inside the tube. Therefore, it has a small volume, high voltage resistance, strong breaking ability, long service life, and does not require maintenance of the contacts. Especially due to its advantages of not exposing the arc and being safe and reliable, it is widely used in industries such as coal, electricity, chemical, metallurgical, textile, and high-rise buildings.
This product, equipped with a suitable operating mechanism, can be assembled into an AC high-voltage circuit breaker, used as a distribution device in three-phase AC power generation and supply systems, and as a centralized control device for electric motors.

technical parameters

Rated voltage 12KV	Rated peak withstand current 80KA	Contact resistance under rated contact pressure ≤ 30 μ Ω
Rated working current 1250, 1600A	Rated power frequency withstand voltage 42KV	The allowable wear thickness of the contact is 3mm
Rated short-circuit breaking current 25, 31.5KA	Rated short-time withstand current 31.5KA	Storage period of 20 years
Rated current breaking times 30 times	Rated short-time withstand time 4S	Equipped with circuit breaker ZN28-12 type
Rated impulse withstand voltage 75KV	Contact self closing force 190 ± 40N
Rated short-circuit closing current 80KA	Contact reaction force at rated torque of 240 ± 40N

External dimensions and installation dimensions

ZKBD-630/12-20 vacuum switch tube