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Vacuum Interrupters-Circuit Breaker

Vacuum Interrupters

BD11-12/1250-31.5B
BD11-12/1600-31.5B
Vacuum Interrupters-Circuit Breaker
Parameter item Unit Value
Rated voltage KV 12
Rated current A 1250/1600
Rated frequency Hz 50
Rated short-time power-frequency withstanding voltage KV 42
Rated lighting impulses withstanding voltage KV 75
Rated short-circuit breaking current KA 31.5
Rated short-time making current KA 80
Rated short-time withstanding current KA 31.5
Rated peak withstanding current KA 80
Rated duration of short-circuit S 4
Operations of short-circuit breaking current interruption Time 30
Rated single capacitor bank breaking current A 630
Mechanical life Time 10000
Rated contact gap Mm 9±1
Contact closing force due to bellows and atmosphere N 120±50
Force required for specified contact gap N 180±50
Circuit resistance at low limit of rated contact force μΩ ≤20
Contact erosion permission length Mm 3
Moving part weight Kg 1.3
Shelf life Year 20
Specifications of matched switchgear
Rated operation pressure of contact N 3100±100
Average breaking speed m/s 1.1±0.2
Average closing speed m/s 0.6±0.2
Bounce duration of contact closing m/s ≤2
Rebound amplitude of breaking contact mm  
Three-pole simultaneity ms ＜1
* Rated contact stroke can be up to 12mm (Max) in special conditions.
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