6-10kV系列金屬氧化物避雷器（以下簡稱MOA）是用于保護6-10kV電力系統的輸變電電站設備、電容器組免受大氣過電壓和操作過電壓損壞的保護電器。它具有體積小、重量輕、密封好、通流容量大、非線性好等優點。
      該系列MOA內部采用非線性的金屬氧化物電阻片作為核心元件,它具有優異的伏安特性。當系統出現大氣過電壓或操作過電 壓時，電阻片呈現低電阻，使MOA的殘壓被限制在允許值以下，同時吸收過電壓能量，從而對電力設備提供可靠的保護。在MOA的正常運行電壓下，電阻片呈高電阻，使流過MOA的電流很小，起到與系統絕緣隔離的作用。
      表1.無間隙MOA的技術參數見下表：

      6-10kV series of metal oxide surge arresters (hereinafter referred to as MOA) is used to protect the 6-10kV power system transmission and distribution of power station equipment, capacitor bank from the atmosphere over-voltage and over-voltage protection of electrical damage. It has small size, light weight, good seal, high flow capacity, nonlinear and good.
      The series MOA internal nonlinear metal oxide varistor as a core component, it has excellent voltage characteristics. When the system when the atmosphere over-voltage or over-voltage operation, low resistance resistors showed that the residual pressure is limited MOA allowed value, while absorbing over-voltage energy to provide reliable protection for electrical equipment. MOA at normal operating voltage, the varistor resistance was high, the current flowing through the small MOA, the system plays the role of the insulating spacer.
      Table 1 Technical parameters MOA without gaps in the table below: