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ZN12-12 Indoor Vacuum Circuit Breaker

With the rated voltage of 12kV, the ZN12-12 indoor vacuum circuit breaker is suitable to work as the control or protection switch for power transmission and distribution systems of substations or power plants. It is especially suitable for breaking important loads and for occasions needing frequent operations.

Produced on the basis of the technology from German Siemens, this indoor vacuum circuit breaker boasts simple structure, strong breaking ability, complete operating functions, no explosion hazard, long service life, and convenient maintenance. It adopts the spring energy storage type operating mechanism which can be operated manually or electrically (AC or DC).

1. This indoor vacuum circuit breaker is specially developed for the thermal power unit with the capacity over 300,000 kilowatts.

2. It can be used in places with the altitude as high as 2,000 meters.

3. This circuit protection device can operate at low temperatures (-40℃).

4. Different phase spacing combinations can be provided.

5. The indoor vacuum circuit breaker is reliable in switching the capacitor bank.

6. The mechanical life of this product is up to 20,000 times.

7. TH type of indoor vacuum circuit breaker is available.

8. There are multiple breaking levels.

Environmental Conditions
1. Altitude: ≤ 2,000m
2. Ambient air temperature: -25℃~+40℃ (-40℃) *
3. Relative Humidity: Daily average ≤ 95%, monthly average ≤ 90%
4. Earthquake intensity: ≤ class VIII
5. The indoor vacuum circuit breaker should be used in places with no risk of fire or explosion, no corrosive gas, and no severe shaking. (The product can be used in hot and humid places or in places with salt spray or mold.)*

Note: If the indoor circuit breaker needs to be used under the conditions marked with *, customers should mention this when ordering.

Technical Parameters
Item Unit Model/Data
Rated Short-circuit Current Breaking Times time 50 30 12
Rated Operating Sequence Open-0.3s-close open-180s- close open Open-180s- close open -180s- close open
Rated Lightning Impulse Withstand Voltage (Full Wave) kV 75
Rated Short-time Power Frequency Withstand Voltage (1min) kV 42
Closing Time ms ≤ 75
Opening Time ms ≤ 60 (50)
Mechanical Life times 20000 (I~IV) 10000(V~X)
Rated Current Breaking Times times 20000 (I~IV) 10000(V~X)
Power of Energy-storage Motor W 275
Rated Voltage of Energy-storage Motor V ≈110 220 AC、DC
Energy Storage Time s ≤ 15
Rated Voltage of the Closing Electromagnet V DC =110 220
Rated Voltage of the Opening Electromagnet V DC =110 220
Rated Voltage of the Energy Storage Shunt Release V ≈110 220 AC DC
Rated Voltage of No-voltage Release V ≈110 220 AC DC
Rated Current of Over-current Release A 5
Rated Current of Auxiliary Switch A AC10 DC5
Contact Travel mm 11 ± 1 11 ± 1 11 ± 1
Contact Overtravel mm 8 ± 2 8 ± 2 4
Closing Speed m/s 0.6~1.8
Opening Speed m/s ≥ 1
Contact Closing Bounce Time ms ≤ 2
Phases Center Distance mm 210 ± 1.5 230 ± 1.5 250 ± 1.5 275 ± 1.5 280 ± 1.5
Synchronization of the Closing and Opening of the Three Phases ms ≤ 2
Loop Resistance of Each Phase μΩ ≤ 35
Note: The closing speed refers to the average speed when the distance between the moving contact and the static contact is 6mm. The opening speed is the average speed when the moving contact is 6mm from the static contact. The gap of the arc-quenching chambers' contactors is -8±1mm (31.5kA, 40kA) for Siemens and 8+1 0mm (31.5kA), 8 ± 1 mm (40kA) for America's Westinghouse.

BBE is a specialized indoor vacuum circuit breaker manufacturer and supplier in China. Our company offers a vast range of products, including withdrawable switchgear, gas insulated switchgear, and more.

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