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P21NSXS-LSS-NS-06
觸頭參數：接觸器的主觸頭有雙斷點橋式觸頭和單斷點指形觸頭兩種形式。前者的優點是具有兩個有效的滅弧區域，滅弧效果好。通常，額定電壓在380V及以下、額定電流在20A及以下的小容量交流接觸器，利用電流自然過零時兩斷口的近陰極效應即可熄滅電弧。額定電流為20～80A的交流接觸器，在加裝引弧片或利用回路電動力吹弧的條件下，再有雙斷口以配合，就能有效地滅弧，但為可靠起見，有時還需加裝柵片或隔板。若額定電流大于80A，交流接觸器的主觸頭雖是雙斷口的，其滅弧定必須加裝滅弧柵片或采用其他滅弧室。
通常，雙斷口觸頭開距較小，結構較緊湊，體積又小，同時還不用軟連接，故有利于提高接觸的機械壽命。然而，雙斷口觸頭參數調節不便，閉合時一般無滾滑運動，不能清除觸頭表面的氧化物，故觸頭需用銀或銀基合金材料制造，成本較高。單斷口指形觸頭在閉合過程中有滾滑運動，易于清除表面的氧化物，保證接觸可靠，故觸頭可用銅或銅基合金材料制造，成本較低。但觸頭的滾滑運動會增大觸頭的機械磨損。由于只有一個斷口，觸頭的開距要比雙斷口的大，故體積也較大，同時動觸頭需通過軟連接外接，以致機械壽命受到限制。
CJX2交流接觸器接線圖CJX2交流接觸器工作原理CJX2交流接觸器手冊三：輔助觸頭的選用，根據你的設備，可以選擇1a1b，就是一常開一常閉，2a2b，3a1b，5a1b等四：保護作用，可配上熱繼電器的型號使用，如GMC-22的接觸器可配上GTH-22的熱繼電器使用五：成套安裝的尺寸，一般成套選擇的交流接觸器是尺寸小，美觀的接觸器，，一般選用GMC系列的接觸器，性能穩定，美觀大方六：選擇接觸器時，應根據其所控制負載的工作屬輕任務、一般任務還是重任務，電動機或其他負載的功率和操作情況等，選擇接觸器的電流等級。
福州卓凱電子科技有限公司
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