IntroductionZW28-12 series AC high voltage vacuum circuit breaker can be used in the AC 50Hz, rated voltage 12kV three-phase electric net. Mainly are installed in the handcart type and fixed type switchgears.
For the protection & control of the electric equipments in mining ,iindustrial companies, power plants and substations.
Suitable for distribution systems and frequent operation places.
Surrounding1. Ambient temperature: -10ºC~+40ºC 2. Altitude below 1000m
3. Wind pressure ≤700Pa(Wind Speed is 34m/s)
4. Relative diary average temperature ≤95%, monthly average≤90%
5. Shock degree ≤8 class.
Specification| Rated Voltage | 12KV |
| Rated short-circuit breaking current | 20KA, 25KA, 31.5KA, 40KA |
| Power frequency withstand voltage(1 min) | 42KV |
| Lightning impulse withstand voltage | 75KV |
| Rated short-circuit CO current | 50KA, 63KA, 80KA, 100KA |
| Rated moving steady current | 50KA, 63KA, 80KA, 100KA |
| Rated thermal steady current | 20KA, 25KA, 31.5KA, 40KA |
| Rated thermal steady time | 4s |
| Rated short-circuit breaking current breaking times | 30 times |
| All breakig time | ≤100ms |
| Mechanial life | 10000 times |
| Rated operating order | O-0.3s-CO-180s-CO(electric mechanism) |
Mechanical parameter
| Open contact clearance | 11±1mm |
| Contacts over travel | 4±1mm |
| Three phases opening synchronizaton | ≤2ms |
| Contact making spring time | ≤2ms |
| Oil buffer travel | 10mm |
| Phase core distance | 210/230/250/275mm |
| Average breaking speed(before contact oil buffer) | 1.1±0.2ms |
| Average making speed | 0.6±0.2ms |
| Breaking time | Max/rated operation voltage:≤0.05s; Min operation voltage:≤0.06s |
| Making time | ≤0.1s |
| Moving contacts accumulative admitted wearing thickness | 3mm |
Outline and mounting dimension 
Packing and shipping-- Ordinary paper carton for products.
-- Shipping mark according to customer's request.
-- Bulk production will be deliveried by sea and air.
Our Service
-- We have our own factory, professional manufacturer
-- We can send you samples within two weeks.
-- We do OEM & ODM services .
-- We control quality strictly, quality problem: 100% compensation or change
Welcome to visit our factory. Welcome customer or your agent to inspect before order and before lading.
People Ele.Applianceas Group established in 1996, is one of leading manufactures of electric appliance in China.People Group specialized in manufacturing low, medium and high voltage electric apparatus, complete equipment, electrcal wire & cable, electrical transmission & transformation equipment, as well as explosion proof eletric apparatus, meters and instrument, power automation system and so on.
From People Group's brith till present, self-accumulation of capital and resource integration are their secrets to success.By means of restructuring, merging, and building partnerships People Group has created a business model of multi-industries and global diversification, such as urban construction, hydropower stations, energy resources, modern logistics, electronic information systems, foreign trading and so on.People Group possess 4 modernized production bases that total area is over 50 branches and offices overseas.
People Group has been approved by ISO9001, ISO14001 and OHSAS18001 systems.The products are employed in key national projects, such as Pudong airport, the Three Gorges Projects, Beijing Metro, Olympic Palaestra etc.People Group is rated as one of Top 500 Enterprises in China and World Machinery 500."People" is awarded as China Well-known Trademark by China Industrial and Commercial Administration General Department.People products won China TOP Brand and National Inspection Exemption Certificate.
Of era of economic globalization, the international electric appliance industry is growing dramatically, with creates numerous opportunities and challenges.To compete with others for global marketplace, People Ele.Appliance Group Zhejiang Import and Export Corp, an exclusively-invested enterprise, is given birth by People Group.It is registered with National Industrial and Commercial Department, permission granted to incorporate and enjoy independent import and export trading.Improt and Export Corp is a member of China Council for the Promotion of International Trade(CCPIT) and China Chamber of Commerce for Import and Export of Machinery and Electronic Products.As People Group's window onto the rest of world, Import and Export Corp with conception of quality assurance standards and sincere service has won good reputation from our loyal customers all around the world.
The size of staff in People Electrical Appliance Group has increased by 45 folds for over ten years, the marketing network has expanded by 65 times, and the production value is now 75 times as that 0 the very beginning.Though multinationals and domestic enterprises are challenging the group in international market as well as in China, Mr.Zheng Yuanbao, leader of People Electrical Appliance Group, is exerting all his efforts.
