50KA High Voltage Vacuum Circuit Breaker Three Phase AC 50HZ 12KV Upto 4000A
12KV Indoor High-voltage Vacuum Circuit Breaker
ZN28G-12 indoor AC high-voltage vacuum circuit breaker is an indoor switching equipment with three-phase AC 50HZ and rated voltage 12KV.
Features of 12KV vacuum circuit breaker:
1. Simple structure, small size and the operating mechanism is the spring energy storage type.
2. It can be operated by AC power or DC power supply.
3. Compound insulated complted structure, small size, low noise and easy installation.
4. Ceramic and glass arc-chutes, with high vacuum insulating performance and special design, high rupture ability, long endurance and no explosive danger.
5. According to different customers' requirements, suitable for all kinds of switchgear.
Mounting Dimension:
Mounting :
Technical Parameters:
| Items | Unit | Date | |||
| Rated voltage |
KV |
12 | |||
| Rated impulse withstand voltage | 75 | ||||
| Rated short-time power frequency withstand voltage (1min) | 42 | ||||
| Rated frequency | Hz | 50 | |||
| Rated short-circuit breaking current | KA | 20 | 25 | 31.5 | 40 |
| Rated current | A |
630 1000 1250 |
630 1000 1250 1600 |
1250 1600 2000 2500 |
1600 2000 2500 3150 4000 |
| Rated short-time withstand current | KA | 20 | 25 | 31.5 | 40 |
| Rated peak tolerable current | 50 | 63 | 80 | 100 | |
| Rated short-circuit making current (peak value) | 50 | 63 | 80 | 100 | |
| Secondary circuit power frequency withstand voltage (1min) | V | 2000 | |||
| Rated operation sequence |
O－0.3S－CO－180S－CO O－180S－CO－180S－CO (at 40KA) |
||||
| Rated duration of short circuit current | S | 4 | |||
|
Rated single/back-to-back capacitance bank breaking current Set breaking current
|
A | 630/400 | |||
| Rated short-circuit breaking current DC flow percentage | ≤35% | ||||
| Average closing speed | m/s | 0.6±0.2 | |||
| Average opening speed | m/s | 1.2±0.3 | |||
| Opening time | ms | ≤60 | |||
| Closing time | ms | ≤80 | |||
| Mechanical life | times | 10000 | |||
| Rated short-circuit breaking current breaking times | times | 30 | |||
| Allowable wear accumulate thickness of moving and static contacts | mm | 3 | |||
| Rated closing operating voltage | v | AC110/220 DC110/220 | |||
| Rated opening operating voltage | v | AC110/220 DC110/220 | |||
| Rated voltage of energy storage motor | v | AC110/220 DC110/220 | |||
| Contact opening distance | mm | 11±1 | |||
| Contact stroke | mm | 4±1 | |||
| Contact bounce time | ms | ≤2 | |||
|
Three - phase opening and closing heterogeneity |
ms | ≤2 | |||
| Opening contact rebound amplitude | ms | ≤3 | |||
| Main circuit resistance | Ω | ≤40 (≤25 at 40KA) | |||
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