High Voltage Switch Company - Electronic Components - High Voltage Vacuum Circuit Breaker

High Voltage Vacuum Circuit Breaker

MZZ6-12 Indoor AC High Voltage Vacuum Circuit Breaker

Introduction: High Voltage Vacuum Circuit Breaker
MZZ6-12 Indoor AC High Voltage Vacuum Circuit Breaker is applied to the power system of 50Hz three-phase AC and 7.2kV~12kV rated voltage. It is widely used in various situations for frequent operations of different loads. It protects such electrical equipments as industrial and mining enterprises, power plants and substations. It can be used with KYN28A-12(GZS1) mid-insert handcart power box as well as XGN-□ fixed power box.
This product meets 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" . It also meets DL/T403"Order Technical Conditions of 10~35KV Indoor AC High Voltage Vacuum Circuit Breaker" .

Environmental Conditions - High Voltage Vacuum Circuit Breaker
1. Environmental temperature: maximum temperature +40°C, minimum temperature -15°C (transportation storage at -30°C is allowed)
2. Environmental humidity:
- Daily average relative humidity: ≤95%
- Monthly relative humidity: ≤90%
- Daily saturated evaporation pressure: ≤2.2×KPa
- Monthly saturated evaporation pressure:: 1.8×KPa
3. Altitude: lower than 1000m
Model Meaning
Electrical parameters --- MZZ6-12 High Voltage Vacuum Circuit Breaker
Name Unit Data
Rated voltage Kv 12 12 12 12 12
Rated frequency HZ 50 50 50 50 50
Rated current A 630, 1250 630, 1250 630, 1250, 1600 1250, 1600, 2000 2000, 2500, 3150
Rated insulation level 1min working frequency voltage tolerance KV 42 42 42 42 42
Rated lightening impact voltage tolerance 75 75 75 75 75
Rated short circuit breaking current KA 16 20 25 31.5 40
Rated short circuit closed current (peak value) 40 50 63 80 100
Rated (peak value) current tolerance 40 50 63 80 100
Rated short circuit current tolerance 16 20 25 31.5 40
Rated times of short circuit breaking current   50 50 50 50 30
Rated short circuit duration time Second 4 4 4 4 4
Secondary circuit working frequency voltage tolerance(1min) V 2000 2000 2000 2000 2000
Rated operation order   O-t-CO-t1-Co
Mechanical life span   30000 30000 30000 30000 10000

Note: *16KA, 20KA, 25KA, 31.5KA：t1=180s; 40kA：t=180s, t1=180s 3, MZZ6-12
Mechanical parameters - High Voltage Vacuum Circuit Breaker
Name Unit Data
Contact open size Mm 11±1 11±1 11±1 11±1 11±1
Excess travel Mm 3±0.5 3±0.5 3±0.5 3±0.5 3±0.5
Different periods of three-phase open/close the switch Ms <=2 <=2 <=2 <=2 <=2
Contact bouncing time of closing switch Ms <=2 <=2 <=2 <=2 <=2
Central distance   210±1.5 210±1.5 210±1.5 210±1.5 210±1.5
Contact pressure of closing the switch N 16KA 20KA 25KA 31.5KA 40KA
200±200 2400±200 2400±200 3100±200 4250±250
Average Switch opening speed Ms 1.1±0.2
Average Switch closing speed M/s 0.6±0.2
Switch opening time, when the operation voltage is: Maximum Ms ≤50
Rated ≤60
Minimum ≤60
Switch closing time Ms ≤100
Allowed attrition thickness of dynamic and static contact Mm 3
Main circuit resistance μΩ 630A
1250A
1600-2000A
2500-3150A
4000A		 ≤50μΩ
≤45μΩ
≤35μΩ
≤25μΩ
≤20μΩ
Rated power of electrical energy storage device W 70(40KA 100W)
Energy storage time S <10

Technical data of opening/ closing switch coils
Opening switch coil Closing switch coil Note
(V)rated operation voltage DC220,DC110;AC220,AC110 DC220,DC110;AC220,AC110 Do not open the switch when the opening coil is smaller than 30% of rated operation voltage.
(W)coil power 245 245
Normal working voltage range 65%~120% rated voltage 85%~110% rated voltage
Installation Dimensions - High Voltage Vacuum Circuit Breaker (Note): These parameters are from ZN63A-12/?-40KA.
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