1
1. Overview
1-1 General:
VB 40.5 vacuum circuit breaker (hereinafter referred to as circuit breaker) is applicable to AC 50Hz
and 35kV Power Systems, and can be used as protection and control equipment for industrial and mining
enterprises, power plants and substations, and is applicable to frequently operated occasions.
1-2 General provisions:
The circuit breaker complies with the following standards:
GB/T 1984 High-voltage alternating-current circuit-breakers
IEC 62271-100 High-voltage switchgear and controlgear - Part 100: Alternating current
circuit-breakers
IEC 60694 Common specifications for high-voltage switchgear and controlgear
standards
DL/T 403 HV vacuum circuit-breaker for rated voltage 12kV to 40.5kV
1-3 Normal operating conditions:
Ambient temperature
Maximum temperature: + 40ºC
Minimum temperature: - 25ºC
Maximum daily average temperature: + 35ºC
Ambient humidity
Daily average relative humidity: ≤95%
Monthly average relative humidity: ≤90%;
Daily average saturated vapor pressure: ≤2.2×10
-3
Mpa
Monthly average saturated vapor pressure: ≤1.8×10
-3
Mpa
Earthquake intensity: No higher than Level 8
Altitude: ≤ 1000m, conventional products can be used below 1000m above sea
level, and high-altitude products need to be noted when ordering.
Others: no inflammable and explosion hazard, no chemical corrosive gas and no violent vibration.
Note: in case of different use environment or other special requirements, it is necessary to consult with
the manufacturer.
2.
Structural principle
2-1 Main structure
The circuit breaker adopts integrated and modular design, and the overall structure is simple and
reasonable. It adopts upper and lower settings, with the arc extinguishing chamber part above and the
interlocking and operating mechanism part below. Special spring operating mechanism is used, without
adjustment, and the action is stable and reliable.
The vacuum arc extinguishing chamber of the three-phase conductive circuit of the circuit breaker is
arranged in the closed solid sealing pole column, which not only improves the insulation performance of the
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