MS2 Series Three-Phase Circuit Breaker, optimized based on the mature MS1 series technology. It adopts the company's proprietary MS-type semi-hard magnetic material and advanced magnetically controlled drive technology, specifically designed for 10kV air-insulated switchgear (AIS) and SF₆ gas-insulated ring main units in power distribution systems.
As a three-phase AC 50Hz primary switching device with a rated voltage of 12kV, it is mainly used in power distribution networks of substations, industrial and mining enterprises, new energy projects, and urban and rural power grids. It undertakes the tasks of breaking and closing load currents, overload currents, and short-circuit currents, and can quickly isolate faults to ensure the safe, stable, and efficient operation of the power system.
| No. | Item | Unit | MS2-01 | MS2-02 | MS2-03 | MS2-04 | MS4-05 | MS4-06 |
| 1 | Rated voltage | kV | 12 | 12 | 12 | 12 | 12 | 12 |
| 2 | Rated current | A | 630 | 630 | 630 | 630 | 1000* | 1000* |
| 3 | Rated power frequency withstand voltage | kV | 42 | 42 | 42 | 42 | 42 | 42 |
| 4 | Rated impulse withstand voltage | kV | 85 | 85 | 85 | 85 | 85 | 85 |
| 5 | Rated short circuit breaking current | kA | 20 | 25 | 20 | 25 | 20 | 25 |
| 6 | Rated peak withstand current | kA | 50 | 63 | 50 | 63 | 50 | 63 |
| 7 | Rated short-circuit withstand current | kA | 20 | 25 | 20 | 25 | 20 | 25 |
| 8 | Duration of short circuit | s | 4 | 4 | 4 | 4 | 4 | 4 |
| 9 | Rated frequency | Hz | 50 | 50 | 50 | 50 | 50 | 50 |
| 10 | phase center distance | mm | 210 | 210 | 180 | 180 | 200 | 200 |
| 11 | Contact distance | mm | 8±0.5 | 8±0.5 | 8±0.5 | 8±0.5 | 8±0.5 | 8±0.5 |
| 12 | Over travel | mm | 2±0.5 | 2±0.5 | 2±0.5 | 2±0.5 | 2±0.5 | 2±0.5 |
| 13 | Rated operation cycle | - | O-0.3s-CO-15s-CO | |||||
| 14 | Inherent closing time(don't include DM) | ms | ＜25 | ＜25 | ＜25 | ＜25 | ＜25 | ＜25 |
| 15 | Different time of closing operation | ms | ≤2 | ≤2 | ≤2 | ≤2 | ≤2 | ≤2 |
| 16 | Bouncing time | ms | ≤2 | ≤2 | ≤2 | ≤2 | ≤2 | ≤2 |
| 17 | Inherent opening time(don't include DM) | ms | 5±0.5 | 5±0.5 | 5±0.5 | 5±0.5 | 5±0.5 | 5±0.5 |
| 18 | Different time of opening operation | ms | ≤2 | ≤2 | ≤2 | ≤2 | ≤2 | ≤2 |
| 19 | Mechanical operations(CO-cycles) | Times | 50000 | 50000 | 50000 | 50000 | 50000 | 50000 |
| 20 | Rated short-circuit-breaking current time | Times | 50 | 50 | 50 | 50 | 50 | 50 |
| 21 | Number of auxiliary switches | pcs | 6NO+6NC | |||||
| 22 | Weight | kg | 32 | 32 | 32 | 32 | 32 | 32 |
note: Aluminum heat sinks need to be added.
Ultra-Fast Fault Isolation: The intrinsic opening time is as low as 4ms, which is 10% faster than the MS1 series, effectively reducing fault impact range.
Higher Action Precision: Three-phase opening/closing asynchronism ≤1.5ms, action dispersion <±0.3ms, ensuring stable operation of the power grid.
Zero Bounce & Low Overvoltage: Full-life cycle closing zero bounce design avoids overvoltage damage to electrical equipment.
Wide Current Adaptability: Covers 630A-1250A rated current range, meeting the needs of different power distribution scenarios.
Strong Environmental Adaptability: Reinforced insulation and dustproof/waterproof design, suitable for high humidity, high altitude, and other harsh environments.
Intelligent Integration: Supports seamless connection with intelligent controllers, realizing remote control, status monitoring, and fault alarm functions.
Suitable for air insulated switchgear, for arc elimination line selection, phase selection, bypass and other applications.
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