ZN28 series high-voltage vacuum circuit breakerDetailed product description：

The ZN28-12 series vacuum circuit breaker is a high-voltage indoor switchgear with a rated voltage of 12kV and three-phase AC 50Hz. It is a product manufactured by our factory with technology introduced from Xi'an High Voltage Apparatus Research Institute.

The ZN28 series high-voltage vacuum circuit breaker complies with the GB1984-89 standard and is currently a substitute product for domestically produced ZN3, ZN4, and ZN5B.

The ZN28-12 series vacuum circuit breaker is a miniaturized structure with the characteristics of small size, large breaking capacity, long service life, no explosion hazard, simple maintenance, and low cost. It is suitable for protection and control in industrial and mining enterprises, power plants, and substations, especially in places with frequent operations such as switching capacitor banks, controlling electric furnace transformers, and high-voltage motors. The overall structure of this product is divided into two forms: integrated installation of switch body and operating mechanism, and separate installation of switch body and operating mechanism. The integrated structure is the basic type of ZN28-12, suitable for various mid mounted fixed switchgear, such as OGXZ-12. There are two types of split structure: ZN28A-12 type, suitable for various fixed switchgear, such as GG-1A, XGNZ-12 and ZN28C-12 type; Suitable for various floor standing handcart style switchgear, such as JYNZ-12, KYNI-12, etc.
This product can be equipped with CD17, CD10 DC electromagnetic operating mechanisms and CT8, CTI7, CT19 spring energy storage operating mechanisms.

Model and its meaning



Overview
Technical Specifications


Outline drawing

Main technical parameters of circuit breaker

serial number	name	unit	data
			ZN28.12/1250.20	1250 ZN28-12/1600.31.5 two thousand	two thousand ZN28-12/2500-40 three thousand one hundred and fifty
one	rated voltage	KV	twelve
two	maximum voltage	KV	twelve
three	rated current	A	one thousand two hundred and fifty	1250 1600 2000	2000 2500 3150
four	Rated short-circuit breaking current	KA	twenty	thirty-one point five	forty

Dimensions of ZN28-12 series circuit breaker (mm)

five	Rated short-circuit closing current (peak)	KA	fifty	80I100
six	Rated dynamic stability current (peak value)	KA	fifty	80I100
seven	Rated stable current (effective value)	KA	twenty	31.5 40
eight	Rated thermal stability time	S	four
nine	Rated short-circuit breaking current breaking times	time	30(50)	thirty
ten	Total breaking time	ms	≤100
eleven	Rated operating sequence		Split -0.3s split -180s split	Split -180s Split -180s Split
twelve	One minute power frequency withstand voltage (effective value)	KV	forty-two
thirteen	Lightning impulse withstand voltage	KV	seventy-five
fourteen	mechanical life	time	ten thousand
fifteen	Rated breaking current of a single capacitor bank	A	six hundred and thirty
sixteen	Rated back-to-back capacitor bank breaking current	A	four hundred

ZN28 series high-voltage vacuum circuit breaker

ZN28-12/1250--20	seven hundred and thirty-one	six hundred and seventy-eight	five hundred and seventy-two	six hundred and eighteen	twenty-three	two hundred and seventy-five	two hundred and sixty-three	six hundred	two hundred and thirty
1250 ZN28-1 -2/1600-31.5 2000	seven hundred and ninety	seven hundred and thirty	five hundred and twenty-seven	six hundred and eighteen	twenty-three	31 6	two hundred and twenty-seven	six hundred and forty	two hundred and fifty
ZN28-12/2000-40	seven hundred and ninety	seven hundred and thirty	five hundred and seventy-seven	six hundred and twenty-three	twenty-three	three hundred and sixteen	two hundred and twenty-seven	six hundred and forty	two hundred and fifty
ZN28-12/3150-40	eight hundred and forty-two	seven hundred and ninety-two	six hundred and six	six hundred and fifty-two	twelve	three hundred and forty-two	two hundred and twenty-seven	six hundred and ninety	two