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

JTD 12kv 1250A 20KA vacuuminterrupter for Solid embedded poles

Rated voltage: 12 KV

Rated current: 1250A

Rated power frequency withstand voltage (1min): 42 KV

Rated lightning impulse withstand voltage:75 KV

Rated short circuit breaking current: 20KA

Rated short circuit making current(peakvalue): 50KA

Breaking operations under rated shortcircuit 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 andatmosphere: 70±40 N

Force required to hold contacts opening atfull stroke: 120±50 N

Circuit resistance at lowest rated contactsforce: ≤35μΩ

Storage life: 20 years

Limiting abrasion of contacts: 3 mm

Weight of moveable parts: ≤0.7kg

Mechanicalrequiements 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 closingoperation: ≤2 ms

Contacts re-bouncing clearance at openingoperation: ≤2 mm

Synchronism of three phases: ≤1 ms