ZN72-40.5 Indoor high-voltage vacuum circuit breakerDetailed product description：

The ZN72-40.5 vacuum circuit breaker is an indoor high-voltage switchgear with a rated voltage of 40.5kV and three-phase AC 50Hz. This circuit breaker mechanism is integrated with the switch; The dedicated operating mechanism is a spring energy storage type, which can be operated using AC/DC energy storage or manually operated.

ZN72-40.5 indoor high-voltage vacuum circuit breaker has a simple structure, strong breaking capacity, long service life, complete operating functions, no explosion hazard, and easy maintenance. It is suitable for use as a control or protection switch in power plants, substations and other transmission and distribution systems, especially for breaking important loads and places with frequent operations.

serial number	name	unit	Technical Specifications
one	rated voltage	kV	forty point five
two	rated current	A	1250, 1600, 2000
three	Rated short-circuit breaking current	kA	25 31.5
four	Rated short-circuit closing current (peak)	kA	63 80
five	Rated operating sequence		O-0.3s-CO-180s-CO
six	Dynamic stability current (peak value)	kA	63 80
seven	4 S thermal stability current	kA	25 31.5
eight	Rated short-circuit current breaking times	time	twenty
nine	Rated lightning impulse withstand voltage (full wave)	kV	one hundred and eighty-five
ten	Rated short-time power frequency withstand voltage (1min)	kV	ninety-five
eleven	Rated current breaking times	time	6000 10000
twelve	mechanical life	time	6000 10000
thirteen	closing time	S	≤ 0.09
fourteen	Opening time	S	≤ 0.07
fifteen	Energy storage motor power	W	three hundred and fifty
sixteen	Rated voltage of energy storage motor	V	≌ 110, ≌ 220
seventeen	Energy storage time	S	≤ 15
eighteen	Rated voltage of closing electromagnet	V	-110 -220
nineteen	Rated voltage of the opening electromagnet	V	-110 -220
twenty	Rated current of overcurrent release device	A	five
twenty-one	Rated current of auxiliary switch	A	AC ： 10 DC ： 5

Note: The opening and closing times are the operating times at the highest, lowest, and rated operating voltages.

ZN72-40.5 Indoor High Voltage Vacuum Circuit Breaker