ZKTJ-400/1140 type ceramic vacuum switch tubeDetailed product description：

purpose
The ZKTJ-400/1140 ceramic vacuum switch tube uses high alumina ceramic as the insulation 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, 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 of ZKTJ-400/1140 ceramic vacuum switch tube

Rated working voltage 1140V;	Rated working current 400A;	Rated connection capacity 4KA, 100 times
Rated breaking capacity of 3.2KA, 25 times;	Ultimate breaking capacity 4.5KA, 3 times	Rated short-time withstand current 3.2KA;
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 100 ± 10N;
The reaction force at the rated opening distance of the contact is 125 ± 12N;
The contact resistance under the self closing force of the contact is ≤ 100 μ Ω;
The allowable wear thickness of the contact is 1mm;
The maximum mass of the switch tube is 0.75kg;
Equipped with contactor CKJ5-400 type.

External dimensions and installation dimensions:

ZKTJ-400/1140 ceramic vacuum switch tube