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As indoor AC high voltage switchgear of rated voltage of 12KV and three-phase 50Hz, the DYZN28A-12 series indoor AC HV vacuum circuit breaker services in the fixed type switchgear or removable switchgear for replacing the oil minimum circuit-breaker inside backward switchgear. The circuit-breaker can function as protection and control device for electric equipment in mineral & industrial enterprise, power plant and substation and the occasions featuring frequent operation.
In compliance with the standards GB 1984, JB3855, DL/T403
TECHNICAL SPECIFICATIONS
|
Rated voltage |
12KV |
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Rated current |
630A, 1000A, 1250A |
|
Rated insulation level |
1min power frequency withstand voltage |
42KV |
|
Rated switch lightning impulse withstand voltage |
75KV |
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Rated short-circuit breaking current |
20KA, 25KA, 31.5KA |
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Rated short-time withstand current |
50KA, 63KA, 80KA |
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Rated peak withstand current |
20KA, 25KA, 31.5KA |
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Rated duration of short-circuit |
4s |
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Mechanical endurance |
10000 times |
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Mini Circuit Breaker (MCB)