Jtd 12kv 1250a 20a Vacuum Interrupter For Solid Embedded Poles

By keeping track with the market developments, we are eminent Exporter, Manufacturer & Supplier of JTD 12KV 1250A 20A Vacuum Interrupter For Solid Embedded Poles in Yichang, Hubei, China.
Rated voltage: 12KV
Rated current: 1250A
Rated power frequency withstand voltage (1 min): 42KV
Rated lightning impulse withstand voltage: 75KV
Rated short circuit breaking current: 20KA
Rated short circuit making current(peak value): 50KA
Breaking operations under rated short circuit breaking current: 30 times
Rated short time withstand current: 20KA
Rated withstand current(peak value): 50KA
Rated duration of short circuit: 4s
Mechanical life: 20,000 times
Closing force due to bellows and atmosphere: 70A 40N
Force required to hold contacts opening at full stroke: 120A 50N
Circuit resistance at lowest rated contacts force: a 35I IC
Storage life: 20 years
Limiting abrasion of contacts: 3mm
Weight of moveable parts: a 0.7kg

Mechanical requiements of vacuum circuit breaker
Clearance between opening contacts: 7A 1mm
Average opening speed: 1.0A 0.25 m/s
Average closing speed: 0.65A 0.15 m/s
Rated contacts pressure: 1600A 100N
Contacts bouncing duration at closing operation: a 2ms
Contacts re-bouncing clearance at opening operation: a 2mm
Synchronism of three phases: a 1ms