自復式過欠壓保護器簡寫為OUPA,OUPA是Over Voltage And Under Voltage Protective Device With Auto-Reclosing Function的簡寫,意思是當線路中過電壓和欠電壓超過規定值時能自動斷開,并能自動檢測線路電壓,當線路中電壓恢復正常時能自動閉合的裝置。主要用于家庭及商場配電(單相AC230V,三相四線AC415V)線路中作為過電壓、欠電壓、斷相、斷零線保護用。
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