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PILZ安全繼電器是控制端為直流或方脈沖波輸入，輸出端為交流隨機型,，特點是隨著控制端直流或方脈沖波的輸入,，受控制端無論在任何相位上都即時導通,。適合于要求導通時間短、開關速度快的控制系統(tǒng)中,。當過零型固態(tài)繼電器用于如變壓器這類感性負載時,，會引起很大的浪涌電流,，使用隨機開啟固態(tài)繼電器是解決的方法之一,。它可以在*個半周內的任意時刻使輸出器件導通，這種開啟方式,，顯著減少了惡劣條件下的開啟機會,，提高了固態(tài)繼電器的使用壽命,。尤其對三相電機等三相負載，為使執(zhí)行控制的多個固態(tài)繼電器同時接通,，采用隨機型交流固態(tài)繼電器更為合適,。
安全繼電器是由數(shù)個繼電器與電路組合而成,，為的是要能互補彼此的異常缺陷，達到正確且低誤動作的繼電器完整功能,，使其失誤和失效值愈低,，安全因素則愈高，因此需設計出多種安全繼電器以保護不同等級機械,，主要目標在保護暴露于不同等級之危險性的機械操作人員。