Product Description
1.Specifications
The VEM-12B indoor high-voltage vacuum circuit breaker (the circuit breaker below) is used in indoor switchgear of 12 kV power systems, and as the protection and control unit for equipment in the grid and power equipment for industrial and mining establishments, it is used to control and protect cables, overhead lines, distributing substations, motors, transformers, generators, capacitors and other equipment in the distribution system.
2.Features
1)The circuit breaker satisfies requirements of M2 level, E2 level (274 times) and C2 level
2)Highly Reliable Modular Spring Operating Mechanism
3)Good Insulation Property ( the embedded poles structure)
4)Good Breaking Buffer Performance(guided variable damping oil buffer with a tapered piston )
5)Flexible Configuration
6)Reliable Anti-maloperation Interlocking
3.Main Technical Data
4.Productive Capability
This production plant is one of our production plants special for intelligent switching elements, switchgear, intelligent switching packaged equipment,
automatic passing of the phase separation system, box-type substations,DC field key equipment and other electrical products.This is the largest one-block medium switch factory in China (and even in the world) with the highest degree of automation and the most advanced manufacturing technologies fitted with world-class APG casting equipment manufactured by Germany Heydrich, busbar process equipment manufactured by Germany EHRT, laser welder manufactured by ABB, automatic storage & retrieval system and automatic production lines of products (including medium voltage circuit breaker, high and low voltage switchgear, and ring main unit switchgear).
Plant aerial view
Circuit breaker assembly line
Circuit breaker withstand voltage test
Circuit breaker characteristics test bench
Germany Trumpf L3030 laser cutting machine
Japan AMADA laser cutting machine
Finland FINN-POWER sheet metal flexible manufacturing production line
5.Some Outstanding Achievements in National Key Projects
1)Beijing-Tianjin intercity high-speed rail;
2)Alternative route of the Yellow River-crossing project in South-to-North water diversion;
3)Three Gorges project;
4)Beijing Olympic project;
5)CCTV new site substation project.
1.Specifications
| Distribution Cabinet Width/Phase Spacing | Specifications & Model | Structural Type |
| Optional Ratings Current (A) | Fixed/ Withdrawable Form | |
| 800mm /210mm | 630 | |
| 1250 | ||
| 1600 | ||
| 1000mm /275mm | 1600 | |
| 2000 | ||
| 2500 | ||
| 3150 | ||
| 4000 |
The VEM-12B indoor high-voltage vacuum circuit breaker (the circuit breaker below) is used in indoor switchgear of 12 kV power systems, and as the protection and control unit for equipment in the grid and power equipment for industrial and mining establishments, it is used to control and protect cables, overhead lines, distributing substations, motors, transformers, generators, capacitors and other equipment in the distribution system.
2.Features
1)The circuit breaker satisfies requirements of M2 level, E2 level (274 times) and C2 level
2)Highly Reliable Modular Spring Operating Mechanism
3)Good Insulation Property ( the embedded poles structure)
4)Good Breaking Buffer Performance(guided variable damping oil buffer with a tapered piston )
5)Flexible Configuration
6)Reliable Anti-maloperation Interlocking
3.Main Technical Data
| S/N | Item | Unit | Values |
| 1 | Rated voltage | kV | 12 |
| 2 | Rated short-duration power frequency withstand voltage (1min) | 42 | |
| 3 | Rated lightning impulse withstand voltage (peak) | 75 | |
| 4 | Rated frequency | Hz | 50 |
| 5 | Rated current | A | 630~4000 |
| 6 | Rated short-circuit breaking current | kA | 20, 25, 31.5, 40 |
| 7 | Rated short-time withstand current | kA | 20, 25, 31.5, 40 |
| 8 | Rated short-circuit duration | s | 4 |
| 9 | Rated peak withstand current | kA | 50, 63, 80, 100 |
| 10 | Rated short-circuit making current | kA | 50, 63, 80, 100 |
| 11 | Power frequency withstand voltage of secondary circuit (1min) | V | 2000 |
| 12 | Opening time (rated voltage) | ms | 20~50 |
| 13 | Closing time (rated voltage) | ms | 35~70 |
| 14 | Mechanical life | times | 20000 (M2 level) |
| 15 | Electric life | / | Class E2 |
| 16 | Gross wear thickness allowed for the moving and fixed contacts | mm | 3 |
| 17 | Rated closing and opening operating voltage | V | AC 220 DC 110/220 |
| 18 | Rated voltage of charging motor | V | AC 220 DC 110/220 |
| 19 | Rated power of charging motor | W | 80 |
| 20 | Charging time | s | ≤15 |
| 21 | Clearance between open contacts | mm | 9±1 |
| 22 | Overtravel | mm | 3.1±0.3(≤31.5 kA) 3.5±0.5(40 kA) |
| 23 | Contact closing bounce time | ms | ≤2 |
| 24 | Asynchronization for opening and closing of three phases | ms | ≤2 |
| 25 | Rated operating sequence | / | Off -0.3s-on/off-180s-on/off |
| 26 | Rated breaking current of a single/back-to-back capacitor | A | 630/400 |
4.Productive Capability
This production plant is one of our production plants special for intelligent switching elements, switchgear, intelligent switching packaged equipment,
automatic passing of the phase separation system, box-type substations,DC field key equipment and other electrical products.This is the largest one-block medium switch factory in China (and even in the world) with the highest degree of automation and the most advanced manufacturing technologies fitted with world-class APG casting equipment manufactured by Germany Heydrich, busbar process equipment manufactured by Germany EHRT, laser welder manufactured by ABB, automatic storage & retrieval system and automatic production lines of products (including medium voltage circuit breaker, high and low voltage switchgear, and ring main unit switchgear).
Plant aerial view
Circuit breaker assembly line
Circuit breaker withstand voltage test
Circuit breaker characteristics test bench
Germany Trumpf L3030 laser cutting machine
Japan AMADA laser cutting machine
Finland FINN-POWER sheet metal flexible manufacturing production line
5.Some Outstanding Achievements in National Key Projects
1)Beijing-Tianjin intercity high-speed rail;
2)Alternative route of the Yellow River-crossing project in South-to-North water diversion;
3)Three Gorges project;
4)Beijing Olympic project;
5)CCTV new site substation project.