Npc’s Arc resistant ceramic is made by Zircon. A high tension air circuit breaker and electro magnetic switch. Arc resistance ceramic is a excellent arc extinguish material and it is able to protect other parts from the arc heating.
- 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 to the frame for 5 second by maximum temparture, and pausing for 10 second. The test is operated this cycle for 5 times.
Properties and stats
|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|