Zn23-40.5 Indoor Vacuum Circuit Breaker

ZN23-40.5 MV vacuum circuit breaker is indoor MV distribution device of three-phase AC 50Hz, rated voltage 40.5kV, can be matched with JYN35/GBC-35 type switch cabinet. Suitable for control and protection in power plant, substation and power distribution system, especially suitable for frequent operation places. The vacuum circuit breaker is handcart type, with reasonable structure, convenient maintenance, safe and reliable use.

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Technical Data

Item	Unit	Parameter
Parameters of voltage, current, life
Rated voltage	kV	40.5
Rated short time power frequency withstand voltage (1min)	kV	95

Rated lightning impulse withstand voltage (peak)	kV	185
Rated frequency	Hz	50
Rated current	A	1250 1600 2000
Rated short-circuit breaking current	kA	25	31.5
Rated short-time withstand current (RMS)	kA	25	31.5


Rated peak withstand current	kA	63	80
Rated short-circuit closing current	kA	63	80
Rated single / back-to-back capacitor bank breaking current	A	600/400
Rated short-circuit current duration	S	4
Rated short-circuit current breaking times	Times	20
Rated operating sequence		O-0.3s-CO-180s-CO
The main galvanic circle resistance	μΩ	≤65

Rated operation voltage		≌ 220/110
Mechanical life	Times	≥ 10000
Mechanical property parameters
Open clearance between contacts	mm	22±2
Overtravel	mm	6±1
Contact closing bounce time	ms	≤3
Three-phase, switching synchronism	ms	≤2
Average opening speed	m/s	1.7 ±0.2
Average closing speed	m/s	0.75 ±0.2
Opening time (rated voltage)	ms	≤90
Closing time (rated voltage)	ms	≤60
Allowable wear thickness for dynamic and static contact	mm	3