Indoor AC High Voltage Vacuum Circuit BreakerDetailed product description：

The MZZ7-24 indoor AC high-voltage vacuum circuit breaker is the latest generation of serialized 24kV vacuum circuit breakers developed by our company with reference to domestic and foreign technology research. The main design concept is to use solid sealed insulation performance as the main electrical circuit, improve the design operating mechanism, and ensure stable insulation performance, mechanical reliability, and significantly improved breaking performance of the circuit breaker, truly achieving maintenance free and longer mechanical and electrical life. And without explosion hazard and pollution, it is used for the protection and control of single busbar electrical facilities in industrial and mining enterprises, power plants, and substations, and is suitable for frequent operation places. It can also be used for special occasions such as capacitor banks.

Structural features:
This product complies with the national standards GB1984-2003 "AC High Voltage Circuit Breaker" and IE62271-100 "AC High Voltage Circuit Breaker". Meet the technical requirements for ordering 10-35kV indoor high-voltage vacuum circuit breakers (DL/T403).

MZZ7-24 indoor AC high-voltage vacuum circuit breaker model meaning


environmental conditions
Altitude: not exceeding 1000m;

Environmental temperature: maximum temperature+40 ℃, minimum temperature -15 ℃ (storage and transportation allowed at -30 ℃)

Environmental 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 technical parameters
1. Main technical parameters of MZZ7-24

name		unit	data
rated voltage		Kv	twenty-four
rated frequency		HZ	50/60
Rated insulation level	1-minute power frequency withstand voltage	KV	sixty
	Lightning impulse withstand voltage	Hz	one hundred and twenty-five
rated current		A	1250-3150
Rated short-circuit withstand current (4S)		KA	twenty			twenty-five	thirty-one point five
Rated peak withstand current		KA	fifty			sixty-three	eighty
Rated short-circuit breaking current		KA	twenty			twenty-five	thirty-one point five
Rated closing current		KA	fifty			sixty-three	eighty
Rated short-circuit breaking times		time	thirty
Rated short-circuit duration		second	four
Secondary circuit power frequency withstand voltage (1min)		V	two thousand
Rated capacitor group breaking current		A	400/630
Rated operating sequence			O-0.3s-CO-180s-CO
mechanical life		time	2000 (60000 cycles for magnetic permanent magnet mechanism)

2. MZZ7-24 mechanical characteristic parameters

name	unit	data
Contact opening distance	mm	14±1
overstroke	mm	3.5±1
Bouncing time of closing contact	ms	≤2
Three phase asynchronous opening and closing	ms	≤2
Average opening speed	ms	1.0±0.2
Average closing speed	m/s	1.3±0.2
Opening time	ms	35-70
closing time	ms	20-50
Main electrical circuit resistance	μΩ	630A 1250A one thousand and six hundred 2000A two thousand and five hundred 3150A		≤50μΩ ≤45μΩ ≤35μΩ ≤35μΩ ≤30μΩ ≤25μΩ
Rated power of energy storage motor	W	eighty
Energy storage time	s	<10

Appearance and installation dimensions

MZZ7-24 Indoor AC High Voltage Vacuum Circuit Breaker