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EP40.5/2500-31.5 Embedded Poles
EP40.5/2500-31.5 Embedded Pole

EP40.5/2500-31.5 Embedded Poles

Vacuum Interrupters Integrated Embedded Pole
Parameter item Unit Value
Rated voltage KV 40.5
lighting impulses withstanding voltage (peak) KV 185
Short-time power-frequency withstanding voltage KV 95
Rated frequency Hz 50
Rated current A 1250-2500
Rated short-time withstanding current KA 2531.5
Rated duration of short-circuit S 4
Rated peak withstanding current KA 6380
Rated short-circuit making current KA 6380
Rated short-circuit breaking current KA 2531.5
DC component, max   ≤40%
Operations of short-circuit breaking current interruption Time 20
Rated single capacitor bank breaking current A 400
Rated back-to-back capacitor breaking current A 400
Mechanical life Time 10000
Rated contact gap Mm 20±2
Contact closing force due to bellows and atmosphere N 220±40
Counterforce of contact N 310±40
Circuit resistance at rated contact force μΩ ≤20
Contact erosion permission length Mm 3
Moving part weight Kg 22.7
Internal gas pressure Pa ≤1.3×10-3
Shelf life Year 20
Rated operating sequence 0-0.3s-C0-180s-C0
Mechanical parameters of vacuum switch
Average breaking speed m/s 1.4-2.0
Average closing speed m/s 0.8-1.2
Bounce duration of contact closing Ms ≤3
Rebound amplitude of breaking contact Mm ≤1.5
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