ZN22B-12/1250-31.5 Indoor High Voltage Vacuum Circuit BreakerDetailed product description：

Overview
The ZN22B-12/1250-31.5 vacuum circuit breaker is an indoor high-voltage switchgear with a rated voltage of 12kV and three-phase AC 50Hz. This circuit breaker is designed with reference to the most advanced vacuum switch technology abroad, using a new and reliable spring energy storage control mechanism, combined with a domestically produced first-class "central arc ignition" and longitudinal magnetic field structure vacuum arc extinguishing chamber. The product is increasingly valued and welcomed by the market for its superior vacuum switch function and low sales price. Siemens VS12040PR and VS17005PR vacuum arc extinguishing chambers can also be used to improve the technical performance of the products.

Scope of application
This circuit breaker has a simple structure, high technical parameters, strong breaking capacity, complete operating functions, reliable action, stable performance, long service life, easy maintenance, and no explosion hazard or pollution. It is suitable for use as a control or protection switch and opening and closing container group in power plants, substations and other transmission and distribution systems, especially for breaking important loads and frequent operations.

Main technical parameters of ZN22B-12/1250-31.5 indoor high-voltage vacuum circuit breaker

program	name	parameter	unit	program	name	parameter	unit
one	rated voltage	twelve	kV	thirteen	mechanical life	ten thousand	time
two	rated current	one thousand two hundred and fifty	A	fourteen	Rated current breaking times	ten thousand	time
three	Rated short-circuit breaking current	thirty-one point five	kA	fifteen	Rated power of energy storage motor	two hundred and seventy-five	W
four	Dynamic stability current (peak value)	eighty	kA	sixteen	Rated voltage of energy storage motor	110，220	V
five	Thermal stability current (4s)	thirty-one point five	kA	seventeen	Energy storage time	＜15	A
six	Rated short-circuit closing current (peak)	eighty	kA	eighteen	Rated voltage of closing electromagnet	110，220	V
seven	Rated short-circuit current breaking times	thirty	time	nineteen	Rated voltage of the opening electromagnet	110，220	V
eight	Rated operating sequence	Fen-0.3S-180S-Fen		twenty	Rated voltage of closing interlock device	110，220	V
nine	Rated lightning impulse withstand voltage (full wave)	seventy-five	kV	twenty-one	Rated voltage of voltage loss release device	110，220	V
ten	Rated short-time power frequency withstand voltage (1 minute)	forty-two	kV	twenty-two	Rated current of overcurrent release device	five	A
eleven	closing time	≤0.075	S	twenty-three	Rated current of auxiliary switch	AC10，DC5	A
twelve	Opening time	≤0.065	S	twenty-four	weight	～120	kg

ZN22B-12/1250-31.5 Indoor High Voltage Vacuum Circuit Breaker