Npc’s Arc resistant ceramic is made by Zircon. High tension air circuit breaker and electro magnetic swich, Arc resistance ceramic is used for these kind of parts which is arc extinguish material in a arc extinguish chamber.
- Especially, suitable for direct current arc
- Fire resistance
- thermal shock resistance
- Mechanical strength
- Good electric insulation, withstand voltage
- Easy to absorb the arc heat.
- Dimensional accuracy
Fire resistance test（by Oxy-acetylene flame）
（N-330 arc extinguishing ceramic made by zircon）
Note: Test piece is exposed by oxy-acetylene frame which is belched out from 1.75mm caliber nozzle and the frame is around 100mm length. exposing for 5 second by maximum temparture of frame, and pausing 10 second. The test is operated this cycle for 5 times.
|Water absorption||%||0.2||6.0||JIS C2210|
|apparent specific gravity||3.2||2.7||JIS C2210|
|Bending strength||ordinary state||㎏/㎝2||1000||250||JIS C2210|
|After heated by 500℃||㎏/㎝2||1000||250||JIS C2210|
|Impact bending strength||㎏-cm/㎝2||3.5||1.5||JIS C2210|
|Thermal expansion coefficient||×10-6||3.2||3.0||20~400℃|
|Break down voltage||KV/㎜||14.0||1.5||JIS C2210|
|Strong point||Fine grain
|Usefulness||Pleurum||Arc Barrier, etc|