Model No.: JTD 12kv 1250A 20KAvacuum 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

 

Main technical parameters

Items Value Rated voltage 12kV Rated current 1250A Rated frequency 50Hz 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 20000 times Closing force due to bellows and atmosphere 70±40N Force required to hold contacts opening at full stroke 120±50N Circuit resistance at lowest rated contacts force ≤35μΩ Storage life 20 years Limiting abrasion of contacts 3mm Weight of moveable parts ≤0.7kg

Mechanical requiements of vacuum circuit breaker

Items Value Clearance between opening contacts 7±1mm Average opening speed 1.0±0.25 m/s Average closing speed 0.65±0.15 m/s Rated contacts pressure 1600±100N Contacts bouncing duration at closing operation ≤2ms Contacts re-bouncing clearance at opening operation ≤2mm Synchronism of three phases ≤1ms