The ZN20-500 vacuum circuit breaker is suitable for industrial and mining enterprises, power plants, substations, and frequent operations with AC 50HZ, rated voltage up to 1140KV, and rated current up to 500A. Mainly used for the protection and control of electrical equipment.
The contact belongs to the vacuum medium, therefore, it has small volume, high pressure resistance, high breaking capacity, long service life, and does not require maintenance. Especially due to its advantages of not exposing the arc and being safe and reliable, it is widely used in industrial sectors such as coal, power, chemical, metallurgy, and petroleum.

Technical parameters of ZN20-500 vacuum circuit breaker
Rated working voltage 1140V
Rated working current 500A
Rated short-circuit breaking current 9KA
Rated short-circuit breaking frequency 16 times
Rated current breaking frequency 3000 times
Mechanical lifespan of 15000 cycles
Rated short-time withstand current 9KA
Rated short-time withstand time 4S
Rated power frequency withstand voltage 10KV
Rated opening torque 4 ± 0.4mm
Contact self closing force 100 ± 10N
Contact reaction force at rated opening moment 140 ± 14N
Contact resistance under rated contact pressure ≤ 100 μ Ω

External dimensions and installation dimensions:

ZN20-500 vacuum circuit breaker