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Hubei Dayu Hanguang Vacuum Electric Co.,Ltd.
CN EN

Vacuum interrupter for outdoor circuit breaker TD424B

Model:VITD24/1250-20

Category:VI for outdoor circuit breakers

Product details

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Main Technical Specification
VOLTAGE RATINGS
Rated voltage(Ur)kV24
Rated short-time(1min)power-frequency withstand voltage(Ud)kV79
Rated lightning impulse withstand voltage(Peak)(Up)kV145
Rated frequency(fr)Hz50
CURRENT RATINGS
Rated current(Ir)A1250
Circuit resistance at lowest rated contact forceμΩ≤30
Rated short-circuit breaking current(lsc)kA20
Breaking operations of rated short circuit breaking currentTimes30
Rated short-time withstand current(lk)kA20
Rated duration of short-circuit(tk)s4
Rated peak withstand current(lp)kA50
Rated short-circuit making current(lMc)kA50
Rated cable-charging breaking current(lc)A25
Rated breaking current of single capacitor bank(lsb)A400
Rated breaking current of back-to-back capacitor bank(lbb)A400
MECHANICAL DATA
Weight of movable partskg≤1.5
Closing force due to bellow and atmosphereN120±50
Force required to hold contacts open at full strokeN190±60
MECHANICAL REQUIREMENTS
Clearance between open contactsmm12±1
Average opening speed (contact close position~75%contact gap)m/s1.5±0.2
Average closing speed (30%contact gap-contact close position)m/s0.8±0.2
Rated added external contact final forceN2000±200
Added external contact force at contact touch point1400±150
Contact bouncing duration at closing operationms≤2
Closing and opening non-simultaneity of three-phase contactsms≤1
Maximum rebound during openingmm≤2
LIFE
Storage lifeyears20
Rated mechanical enduranceTimes10000
Contacts limit erosionmm3

Relevant information

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