ZN73A-12/D Indoor High Voltage Permanent Magnet Vacuum Circuit BreakerDetailed product description：

ZN73A-12/D indoor high-voltage permanent magnet vacuum circuit breaker is an advanced product in China. This product adopts the self-developed YG type permanent magnet operating mechanism, which has manual and electric opening and closing functions. It eliminates the complex and vulnerable energy storage and locking devices in traditional spring mechanisms, greatly simplifying the transmission process, especially the manual opening device, which is used for emergency load opening operation in case of secondary operation circuit failure. This truly achieves high reliability, long service life, maintenance free, and simple maintenance. Under normal circumstances, the service life is up to 100000 times.

ZN73A-12/D indoor high-voltage permanent magnet vacuum circuit breaker model meaning


Main technical parameters of ZN73A-12/D indoor high-voltage permanent magnet vacuum circuit breaker

project	unit	parameter
rated voltage	KV	twelve
Rated short-time power frequency withstand voltage (1min)	KV	forty-two
Rated lightning impulse high voltage (peak)	KV	seventy-five
rated frequency	HZ	fifty
rated current	A	630-1250 1250-3150 1250-4000
Rated short-circuit breaking current	kA	20 25 31.5 40
Rated thermal stability current (effective value)	kA	20 25 31.5 40
Rated peak withstand current	kA	50 63 80 100
Rated short-circuit closing current	kA	50 63 80 100
Rated short-circuit duration	S	four
Secondary circuit power frequency withstand voltage (1min)	V	two thousand
Rated operating sequence		Off/off -0.3s - on/off -180s - on/off/off/on/off
Rated breaking current of single/back-to-back capacitor bank	A	six million three hundred and eight thousand and four hundred
Opening time (rated voltage)	ms	≤50
Closing time (rated voltage)	ms	≤75
mechanical life	time	≥100000
Rated short-circuit current breaking times	mm	thirty
Allowable cumulative thickness of wear for dynamic and static contacts	mm	three
Contact opening distance	mm	11±1*
overstroke	mm	3.5±0.5
Contact closing bounce time	ms	≤2(40KA≤3)
Three phase asynchronous opening and closing	ms	≤2
Average opening speed	m/s	0.8-1.2
Average closing speed	m/s	0.5-0.8
Interphase center distance	mm	210 275
Main electrical circuit resistance	uΩ	≤45(Less than 1250A)≤40(1600-2000A)≤30(more than 2500A)
Contact closing contact pressure	N	2000±200(20kA) 2400±200(25KA) 3100±200(31.5KA) 4300±200(40KA)

There are special requirements for the operation power supply (such as DC110V, AC/DC operation), and the technical parameters of the permanent magnet mechanism need to be adjusted.
The contact distance of Westinghouse arc extinguishing chamber is 9 ± 1mm
The contact opening distance of Siemens arc extinguishing chamber is 8 ± 1mm

Appearance and installation dimensions of ZN73A-12/D indoor high-voltage permanent magnet vacuum circuit breaker

ZN73A-12/D indoor high-voltage permanent magnet vacuum circuit breaker