概述Summary1、FN3-12、FN3-12R、FN3-12R/S負荷開關系戶內裝置的高壓電器。適用于交流50Hz、6KV或12KV的網絡中，作為開斷和閉合負荷及過荷電流之用，亦可用作開斷和閉合空載長線。空載變壓器及電容之開關。帶有RN3型熔斷型的負荷開關(FN3-12、FN3-12R/S)可切斷路器，作保護開關之用。2、本負荷開關可配用CS3型及CS2型手動操作機構進行操作。1、FN3-12、FN3-12R、FN3-12R/S Series are used in the network of AC 50Hz、6KV or 12KV for breaking or closing load and over-load current. they are also used in breaking and closing no-loading . The switch or no-load transformer and capacitor with KN3 te fuse box. Can cut off short-circuit for protecting switch.2、They can be equipped with CS3 te and CS2 te handle operating mechani.工作條件Serviec Condition1、海拔不過1000米；2、周圍空氣溫度不高于+40oC及不低于-10oC；3、空氣相對濕度不大于90%的戶內場(當溫度為+25)；4、無導電性塵埃的環境中；5、無破壞金屬和緣的腐蝕性氣體的物體；6、無劇烈震動和沖擊的地方；7、無燃燒與危險的環境中。1 、The altitude does not exceed 1000m.2、The ambient air temperatrue : Max:+40oC. Min:-10oC.3、The relatire humidity of air not bigger 90% (temperature:25oC) 4、The working situation have no conductivity dust.5、The working situation have no corrosive gas of effect insulation anddestroy metal. 6、The working situation without violent vibration and striking.7、The working situation have no explosive danger and fire.?