The metal oxide surge arrester (MOA) is an advanced overvoltage protector in the word. The metal oxide varistors (MOV),Adopt overvoltage limiter Technology . It have good response to steep front surge, excellent volt-ampere characteristics and high discharge capability, which provides a very consistent protection merit at steep front surge, lightning surge and switching surge, and enhances protective capability.
The product has been confirms by the Chinese national center for quality supervision and test of insulators and surge arrest-
ers. The  technical performance of the product conforms to IEC60099-4 standard technical requirements.
金屬氧化物避雷器（M O A）是世界上較先進的過電壓限制器，其核心元件——金屬氧化物電阻片（M O V）,采用過電壓限制器技術。它具有良好的陡波響應能力、卓越的非線性伏安特性和巨大的通流容量，在尖頂波、操作波和雷電波下均有優異的保護能
力，工(gong)作性能幾乎不受波形的(de)影響。

本好產品已能夠國家地區隔熱子避雷器產品質量督查驗證中心的類型現場實驗，其他參數設置均嚴格履行按國際上準則IEC 60099-4《聊天無間距五金硫化物避雷器》履行。  

4.1 環境溫度：不高于+40℃，不低于-40℃;
4.2 海拔不高于3000m;
4.3 額定頻率：50Hz或60Hz;
4.4 長期施加在避雷器上的電壓不高于避雷器
持續運行電壓;
4.5 最大風速：35m/s;

Every polymeric housed MOA puts up the disconnector. The disconnector is equipped with the insulation base. The top bolt of disconnector is directly con- nected with the bottom of MOA, the below bolt is connected with ground lead.
The disconnector shall break away automatically at the fault current while the

MOA failure under the abnormal conditions, and the failed MOA will be separated.

The figure shows the produc’s operation. The dotted line in the figure shows the situation of the grounding part’s disconnection while the disconnector operation.
所有復合外套MOA均可以配套脫離器，其一般安裝于絕緣支架上。上部直接與避雷器的低壓端連接，下部連接接地導線。
當MOA損(sun)傷(shang)，出現(xian)異常電流時，脫(tuo)(tuo)離器(qi)將自(zi)動(dong)脫(tuo)(tuo)離, 使損(sun)傷(shang)的(de)MOA退出系統脫(tuo)(tuo)離器(qi)的(de)工作情(qing)況見右圖。圖中虛線(xian)表示(shi)的(de)就(jiu)是脫(tuo)(tuo)離動(dong)作后，接地(di)部分(fen)斷開的(de)情(qing)形。

 

Current  電壓 (A)	800	200	20	5	0.5	0.95
Operation times 瑜伽動作用時 (s)	0.01～0.02	0.02～0.05	0.1～0.2	0.5～1.0	20～50	200～500

  Note: The last “ L” in the designation means the disconnector. Such as YH10W-24L means that the diconnector has be equipped in the MOA of YH10W-24. If the disconnector isn’t equipped, the “ L” no appear.
注意：型號最后的字母“L”表示脫離器。例如YH10W-24L，表示在型號為YH10W-24的MOA上安裝了脫離器。若不安裝，將不會有字母“L”。