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EP12/1250-31.5B Embedded Poles
EP12/1250-31.5B Embedded Pole

EP12/1250-31.5B Embedded Poles

Vacuum Interrupters Integrated Embedded Pole
Main technical parameters: Unit Value
Rated voltage KV 12
Rated current A 1250
Rated frequency Hz 50
Rated short-circuit breaking current KA 31.5
Breaking times of short-circuit current Time 50
Rated short-circuit making current KA 80
Rated peak withstanding current KA 80
Rated short-time withstanding current (4 seconds) KA 31.5
Rated single capacitor bank breaking current A 630
Rated back-to-back capacitor breaking current A 400
Short-time power-frequency withstanding voltage KV 49
lighting impulses withstanding voltage (peak) KV 85
Circuit resistance at rated contact force μΩ ≤16
Mechanical life Time 30000
Contact closing force due to bellows and atmosphere N 100±30
Counterforce at rated contact gap N 200±30
Contact erosion permission length Mm 3
Shelf life Year 20
Part discharge pC ≤2pC
Rated operating sequence 0-0.3s-C0-180s-C0
Mechanical parameters of vacuum switch
Rated contact gap mm 9±1
Contact connection gap mm 3.5±1
Average breaking speed m/s 1.1±0.2
Average closing speed m/s 0.7±0.2
Rated operation pressure of contact N 3000±200
Bounce duration of contact closing ms ≤2
Out of simultaneity of contact closing and opening ms ≤1
Rebound amplitude of breaking contact mm ≤2
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