JTD 12kv 1250A 20KA vacuum interrupter for Solid embedded poles

Model No.: JTD 12kv 1250A 20KA vacuum interrupter for Solid embedded poles
Rated voltage: 12 KV
Rated current: 1250A
Rated power frequency withstand voltage (1 min): 42 KV
Rated lightning impulse withstand voltage: 75 KV
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: 4 s
Mechanical life: 20,000 times
Closing force due to bellows and atmosphere: 70¯40 N
Force required to hold contacts opening at full stroke: 120¯50 N
Circuit resistance at lowest rated contacts force: ≤35μΩ
Storage life: 20 years
Limiting abrasion of contacts: 3 mm
Weight of moveable parts: ≤0.7kg

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