Indoor AC High Voltage Vacuum Circuit BreakerDetailed product description：

MZZ6-12 indoor AC high-voltage vacuum circuit breaker, suitable for three-phase AC 50Hz, rated voltage of 7.2kV~12kV power system. Widely used in various types of loads and frequent operations, it plays a protective and control role for electrical equipment in industrial and mining areas, enterprises, power plants, and substations. It can be used with KYN28A-12 (GZS1) and other mid mounted handcart switch cabinets, as well as XGN - □ fixed switch cabinets.

The MZZ6-12 indoor AC high-voltage vacuum circuit breaker complies with the national standards GB1984 "AC High Voltage Circuit Breaker", JB3855 "3.6-40.5KV Indoor AC High Voltage Vacuum Circuit Breaker", and IEC60056 "AC High Voltage Circuit Breaker". Meet the technical requirements for ordering 10-35KV indoor high-voltage vacuum circuit breakers (DL/T403).

Structural features:
Model meaning

environmental conditions
Altitude:
Not exceeding 1000m;

Ambient temperature
Maximum temperature+40 ℃, minimum temperature -15 ℃ (storage and transportation allowed at -30 ℃)

ambient humidity:
Daily average relative humidity: ≤ 95%
Monthly average relative humidity: ≤ 90%
Daily average saturated vapor pressure: ≤ 2.2 × KPa
Monthly average saturated vapor pressure: ≤ 1.8 × KPa

Main electrical parameters
1. Main technical parameters of MZZ6-12 vacuum circuit breaker

name		unit	data
rated voltage		Kv	twelve	twelve	twelve	twelve	twelve
rated frequency		HZ	fifty	fifty	fifty	fifty	fifty
rated current		A	630, 1250	630, 1250	630, 1250, 1600	1250, 1600, 2000	2000, 2500, 3150
Rated insulation level	1-minute power frequency withstand voltage	KV	forty-two	forty-two	forty-two	forty-two	forty-two
	Rated lightning impulse withstand voltage		seventy-five	seventy-five	seventy-five	seventy-five	seventy-five
Rated short-circuit breaking current		KA	sixteen	twenty	twenty-five	thirty-one point five	forty
Rated short-circuit closing current (peak)			forty	fifty	sixty-three	eighty	one hundred
Rated (peak) withstand current			forty	fifty	sixty-three	eighty	one hundred
Rated short-circuit withstand current			sixteen	twenty	twenty-five	thirty-one point five	forty
Rated short-circuit breaking current breaking times			fifty	fifty	fifty	fifty	thirty
Rated short-circuit duration		second	four	four	four	four	four
Secondary circuit power frequency withstand voltage (1min)		V	two thousand	two thousand	two thousand	two thousand	two thousand
Rated operating sequence			O-t-CO-t1-Co
mechanical life			thirty thousand	thirty thousand	thirty thousand	thirty thousand	ten thousand

*16KA，20KA，25KA，31.5KA：t1=180s; 40kA：t=180s、t1=180s

3. Mechanical characteristic parameters of MZZ6-12 vacuum circuit breaker

name		unit	data
Contact opening distance		mm	11±1	11±1	11±1	11±1	11±1
overstroke		mm	3±0.5	3±0.5	3±0.5	3±0.5	3±0.5
Three phase asynchronous opening and closing		ms	<=2	<=2	<=2	<=2	<=2
Bouncing time of closing contact		ms	<=2	<=2	<=2	<=2	<=2
Distance from center to center			210±1.5	210±1.5	210±1.5	210±1.5	210±1.5
Closing contact distance pressure		N	16KA	20KA	25KA	31.5KA	40KA
			200±200	2400±200	2400±200	3100±200	4250±250
Average opening speed		ms	1.1±0.2
Average closing speed		m/s	0.6±0.2
Opening time, when the operating voltage is	highest	ms	≤50
	rated		≤60
	minimum		≤60
closing time		ms	≤100
Allowable wear thickness for light accumulation of moving and stationary contacts		mm	three
Main electrical circuit resistance		μΩ	630A 1250A 1600-2000A 2500-3150A 4000A		≤50μΩ ≤45μΩ ≤35μΩ ≤25μΩ ≤20μΩ
Rated power of energy storage motor		W	70(40KA 100W)
Energy storage time		s	<10

4. Technical data of opening and closing coils

	trip coil	closing coil	Remarks
Rated operating voltage (V)	DC220,DC110; AC220,AC110	DC220,DC110; AC220,AC110	The opening coil is less than 30% rated operating power When pressing, do not open the switch
Coil power (W)	two hundred and forty-five	two hundred and forty-five
Normal operating voltage range	65% to 120% rated voltage	85% to 110% rated voltage

Exterior installation dimensions

MZZ6-12 Indoor AC High Voltage Vacuum Circuit Breaker