| Customization: | Available |
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| Breaking Capacity: | High Voltage Circuit Breakers |
| Arc-extinguishing Medium: | SF6 |
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LW3-12 primary and secondary fusion SF6 circuit breaker (hereinafter referred to as circuit breaker) is a new generation of products developed by our company according to the requirements of the national grid primary and secondary fusion complete set of column switches.
The circuit breaker meets the requirements of the primary and secondary fusion set of column switches in the national grid, and has the advantages of compact structure, reasonable layout and complete functions. The indicators of the circuit breaker are in line with the requirements of the State grid primary and secondary fusion complete set of column switches, and through the China Electric Power Research Institute Co., Ltd. primary and secondary fusion special testing.
The circuit breaker adopts three-phase protection current transformer, zero sequence current transformer and zero sequence voltage sensor with unified parameters. It has the characteristics of wide measuring range, high measuring accuracy and high reliability. With the combination of primary and secondary fusion controller, it can quickly and accurately determine various line faults.
| Item | Units | Value | |
| rated voltage | kV | 12 | |
| rated frequency | Hz | 50 | |
| rated current | A | 630 | |
| rated short circuit breaking current | kA | 20 | |
| rated short time withstand current and duration | kA/s | 20/4; 25/4; 31.5/4 | |
| rated short time withstand current | kA | 20 | |
| rated peak withstand current | 50 | ||
| rated cable charging current | A | 25 | |
| rated operation sequence | 0-0.3s-Co-180s-Co | ||
| rated working pressure (gauge pressure when 20ºC) | MPa | 0.35 | |
| rated minimum functional pressure (gauge pressure when 20ºC) | 0.25 | ||
| 1 min power frequency withstand voltage (under the minimum pressure) | interphase/ to ground | kV | 42 |
| break | 48 | ||
| rated lightning impulse withstand voltage | interphase/ to ground | 75 | |
| break | 85 | ||
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