ZN23-40.5kV Series Indoor Vacuum Circuit Breaker

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parameter name unit Numerical value
Rated voltage KV 40.5
Rated lightning impulse withstand voltage (peak value> KV 185
1min power frequency withstand voltage KV 95
Rated frequency HZ 50
Rated current A 1250、1600、2000
Rated short-circuit breaking current KA 25、31.5
Withstand current at rated short-circuit KA 25、31.5
Rated peak withstand current KA 63、80
Rated short-circuit duration S 4
Rated short circuit breaking time   90
Rated short-circuit making current KA 80
Rated operating sequence   0.3-Combined points-180s-Combined points
Closing time ms 50-85
Opening time ms 50-85
Rated short-circuit breaking current breaking times 20
Mechanical life 10000
Rated capacitor bank breaking current A 630
Rated power of energy storage motor w 275
Rated voltage of energy storage motor V AC/DC220.110
Energy storage time S <15
Rated voltage of closing and opening electromagnet V AC/DC220.110
Rated current of overcurrent release A 5
Auxiliary switch rated current A 10



The ZN23-40.5 vacuum circuit breaker is an indoor high-voltage electrical equipment with a rated voltage of 40.5KV and three-phase AC 50Hz. It is suitable for industrial and mining enterprises, substations and other power transmission and distribution systems for control and protection, especially for metallurgy and electric arcs. Steelmaking and other industries that require frequency operation are used as control and protection equipment.


Shape and installation dimensions

Product model and meaning