Purpose:
ZKTJ and ZKTD ceramic vacuum switch tubes use high alumina ceramics as the insulation shell and high vacuum as the medium inside the tube. Therefore, they have small volume, high voltage resistance, strong breaking ability, long service life, and do not require maintenance of the contacts. Especially due to their advantages of not exposing the arc and being safe and reliable, they are widely used in industries such as coal, electricity, chemical, metallurgy, and petroleum.

This product is equipped with a suitable operating mechanism and can be assembled into high, medium, and low voltage AC circuit breakers or AC contactors. It is used in high, medium, and low voltage distribution control devices for remote connection and disconnection of motors, transformers, capacitor banks, etc. It is particularly suitable for forming explosion-proof magnetic starters.  
Technical parameters
Rated working voltage 6KV; rated working current 630A; rated connection capacity 6.3KA, 100 times
Rated breaking capacity 5.04KA, 25 times; Rated short-time withstand current 5.04KA; Rated short-circuit duration 10S;;
Power frequency withstand voltage 23KV; electrical life 100000 times; Mechanical lifespan of 1 million cycles
The rated opening distance of the contact is 3 ± 0.3mm; the self closing force of the contact is 125 ± 12.5mm; the reaction force at the rated opening distance of the contact is 130 ± 13N;
The contact resistance under the self closing force of the contact is ≤ 120 μ Ω
The allowable wear thickness of the contact is 1mm
Equipped with contactor CKG3-630 type.   

External dimensions and installation dimensions:

ZKTJ-630/6KV (1) type ceramic vacuum switch tube