Primary & Secondary Fusion Pole mounted Circuit Breaker
ZW32-12 type outdoor pillar vacuum circuit breaker (standard fusion type) fully complies with the State Grid's standardized design requirements for primary and secondary integrated overhead circuit breakers (pole type). It is primarily used in three-phase 12kV power systems with a 50Hz alternating current, serving as a segmentation and connection switch for 12kV power lines, as well as a boundary switch at the "T" joint of line users. It is paired with distribution automation terminals (FTUs) that meet the State Grid's standardization design specifications, capable of load breaking and making, handling overloads, short circuits, and providing protection for small current ground faults.Equipped with unified, standardized parameter current-voltage all-in-one sensors, the circuit breaker boasts a wide measurement range, high precision, and high reliability. It offers comprehensive analog signals and accurately identifies various types of line faults, ensuring comprehensive and precise protection functionality.
The circuit breaker canbe equipped with an integrated isolation switch(disconnector), which has a mechanical interlock to prevent mis-operation.
Application environment:
a. Altitude：≤1000m；
b. The surrounding air temperature: -40℃～＋40℃；Daily range of temperature：less than 25℃;
c. The ice thickness shall not exceed 10mm ；
d. The sunshine intensity is not greater than1000W/㎡；
e. The intensity of the earthquake does not exceed 8 degrees；
f. Free from inflammable, explosive, chemical corrosion and violent vibration；
g. The pollution level shall not exceed GB5582 level IV；
Main technical parameters
NO. | Item | unit | value |
1 | Rated voltage | KV | 12 |
2 | rated frequency | HZ | 50 |
3 | Rated current | A | 630/1250 |
4 | Rated short-circuit breaking current | KA | 20/25 |
5 | Rated peak withstand current (peak) | KA | 50/63 |
6 | Rated short-time withstand current (4S) | KA | 20/25 |
7 | Rated short circuit closing current (peak) | KA | 50/63 |
8 | mechanical life | times | 10000 |
9 | times of the rated short circuit closing current is broken | times | 30 |
10 | Rated operating sequence | \ | O—0.3s—CO—180s—CO |
11 | power frequency withstand voltage（1min)：wet) (dry) phase to phase, ground/fracture | KV | 30/42/48 |
12 | Lightning impulse withstand current (peak) phase to phase, ground/fracture | KV | 75/85 |
13 | secondary circuit 1min power frequency withstand voltage | KV | 2 |
Mechanicalcharacteristic parameter
No. | name of parameter | unit | data |
1 | clearance between open contacts | mm | 9±1 |
2 | Contact overtravel | mm | 2.5±0.5 |
3 | opening speed | m/s | 1.2±0.2 |
4 | closing speed | m/s | 0.8±0.2 |
5 | Contact closing bounce time | ms | ≤2 |
6 | Interphase center distance | mm | 340±2 |
7 | Three phase switching and closing different period | ms | ≤2 |
8 | Resistance of each phase conducting loop | μΩ | ≤80(with disconnector≤140) |
9 | closing time | ms | ≤65 |
10 | opening time | ms | ≤45 |
11 | Rated power of energy storage motor | W | 40 |
Outline dimensions:
Installation diagram:
