Tellhow (Shenzhen) Electric Technologies Co., Ltd.
Chinese professional electrical equipments manufacturer

RAD-12 Vacuum Circuit Breaker

By admin • Oct 11th, 2008 • Category: Vacuum Circuit Breakers SF6 Load Break Switches
1. General
RAD-12/T1250-31.5 series of vacuum circuit breakers with embedded poles are used in the switchgear rated 12kV, 50(60)Hz. They are suitale for making different types of loads and frequent operations, to protect and control the electric equipments in industrial & mining enterprises, power plants and substations.It is a fuse-combined 3-position device integrating vacuum circuit breaker, disconnector and earthing switch, among them the disconnector and arc extinguish chamber are embedded as an integration. This design greatly enhances the insulation of its main electric conduction loop and minimizes its dimension.

It is a vacuum circuit breaker with disconnector and earthing switch. It is featuring with multi-function, strong insulation, water-condensation proof, pollution-proof, low resistance and maintenance free.
2. Normal Service Condition
  • Ambient temperature: -25 ℃ ～ +40 ℃
  • Altitude: ≤1000m
  • Relative humidity: daily average relative humidity ≤ 95%; monthly average relative humidity ≤ 90%
  • Free from fire, explosion, heavy pollution, chemical corrosion and severe vibration.
  • Earthquake intensity ≤ 8 degree
  • If the service condition differs from the above , the user should consult it with manufacturer.
3. Technical Parameters
No. Item Unit Parameter
1 Rated voltage kV 12
2 Rated frequency Hz 50
3 Rated current A 1250
4 Rated short-time withstand current kA Main loop 31.5
Earthing loop 27.4
5 Rated short-time withstand current duration s Main loop 4
Earthing loop 2
6 Rated peak withstand current kA Main loop 80
Earthing loop 69.6
7 Rated short-circuit breaking current kA Circuit breaker 31.5
Disconnector /
Earthing loop
8 Rated short-circuit making current kA Main loop 80
9 Power frequency withstand voltage (1 min) Vacuum gap( phase to phase, phase to ground) kA 42
Isolation gap 48
Lightning impulse withstand voltage Vacuum gap( phase to phase, phase to ground) 75
Isolation gap 85
10 Mechanical endurance Vacuum circuit breaker times 20000
Earthing switch 5000
Disconnector
11 Rated operating sequence / O-0.3s-CO-180s-CO
4. Dimensions (withdrawable type)

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