当电流超过某一预定数值时，反应电流升高而动作的保护装置叫做（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69376' and id < 4491259 and id<>'4491259' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69376' and id > 4491259 and id<>'4491259' order by id asc limit 5