ZKTD-400/1140 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 of ZKTD-400/1140 ceramic vacuum switch tube

Rated working voltage 1140V;	Rated working current 400A;	Rated short-circuit breaking current 8KA
Rated short-circuit breaking frequency 16 times;	Rated current breaking frequency 3000 times;	Mechanical lifespan of 20000 cycles;
Rated short-time withstand current 8KA;	Rated short-time withstand time of 4S;	Rated power frequency withstand voltage 10KV
The rated opening distance of the contact is 4 ± 0.4mm;	Contact self closing force 115 ± 11N;
The reaction force at the rated opening distance of the contact is 140 ± 14N;
The contact resistance under the self closing force of the contact is ≤ 100 μ Ω;
Equipped with circuit breaker ZN7-400 type.

External dimensions and installation dimensions