Td 12kv 1250a 25ka (Juc613) Vacuum Interrupter For Vcb

We are supplying TD 12kv 1250A 25KA (JUC613) Vacuum Interrupter for VCB in Yichang, Hubei, China.

Main technical parameters

Rated voltage: 12 KV

Rated current: 1250A

Rated power frequency withstand voltage: 42 KV

Rated lightning impulse withstand voltage: 75 KV

Rated short circuit breaking current: 25KA

Rated short circuit making current(peak value): 63KA

Breaking operations under rated short circuit breaking current: 30 times

Rated short time withstand current: 25KA

Rated withstand current(peak value): 63KA

Rated duration of short circuit: 4S

Mechanical life: 20,000 times

Closing force due to bellows and atmosphere: 120A 50N

Force required to hold contacts opening at full stroke: 190A 50N

Circuit resistance at lowest rated contacts force: a 20I IC

Storage life: 20 years

Limiting abrasion of contacts: 3 mm



Mechanical requiements of vacuum circuit breaker

Clearance between opening contacts: 11A 1mm

Average opening speed(Contacts closing position~75% contacts opening distance): 1.1A 0.2 m/s

Average closing speed(30% contacts opening distance~contacts closing position): 0.6A 0.2 m/s

Rated contacts pressure: 2000A 200N

Contacts bouncing duration at closing operation: a 2ms

Contacts re-bouncing clearance at opening operation: a 2mm

Synchronism of three phases: a 1ms