ZKTJ-250/1140 type ceramic vacuum switch tubeDetailed product description：

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 1140V;	Rated working current 250A;	Rated connection capacity 2.5KA, 100 times
Rated breaking capacity of 2KA, 25 times;	Ultimate breaking capacity 4.5KA, 3 times	Rated short-time withstand current of 2KA;
Rated short-circuit duration of 10S;	Power frequency withstand voltage 10KV;	Electrical lifespan AC4 60000 times
Mechanical lifespan of 1 million cycles;	The rated opening distance of the contact is 2.0 ± 0.2mm;	Contact self closing force 50 ± 5N;
The reaction force at the rated opening distance of the contact is 65 ± 6.5N;
The contact resistance under the self closing force of the contact is ≤ 120 μ Ω;
The allowable wear thickness of the contact is 1mm;
The maximum mass of the switch tube is 0.5Kg;
Equipped with contactor CKJ5-250 type.

ZKTJ-250/1140 Ceramic Vacuum Switch Tube Dimensions and Installation Dimensions

ZKTJ-250/1140 Ceramic Vacuum Switch Tube