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
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Main technical parameters
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Items
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Value
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Rated voltage
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12kV
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Rated current
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1250A
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Rated frequency
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50Hz
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Rated power frequency withstand voltage (1 min)
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42kV
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Rated lightning impulse withstand voltage
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75kV
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Rated short circuit breaking current
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20KA
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Rated short circuit making current(peak value)
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50KA
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Breaking operations under rated short circuit breaking current
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30 times
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Rated short time withstand current
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20kA
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Rated withstand current(peak value)
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50kA
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Rated duration of short circuit
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4s
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Mechanical life
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20000 times
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Closing force due to bellows and atmosphere
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70±40N
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Force required to hold contacts opening at full stroke
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120±50N
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Circuit resistance at lowest rated contacts force
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≤35μΩ
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Storage life
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20 years
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Limiting abrasion of contacts
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3mm
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Weight of moveable parts
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≤0.7kg
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Mechanical requiements of vacuum circuit breaker
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Items
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Value
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Clearance between opening contacts
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7±1mm
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Average opening speed
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1.0±0.25 m/s
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Average closing speed
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0.65±0.15 m/s
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Rated contacts pressure
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1600±100N
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Contacts bouncing duration at closing operation
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≤2ms
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Contacts re-bouncing clearance at opening operation
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≤2mm
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Synchronism of three phases
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≤1ms
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