ABB主控模塊fi830f
熱繼電器是一種保護電氣設備的電器元件，主要用於監測電氣設備的溫度，當溫度超過設定值時，熱繼電器將切斷電路，防止設備因過熱而損壞。熱繼電器的工作原理是過載電流通過熱元件後，使雙金屬片加熱彎曲去推動動作機構來帶動觸點動作，從而將電動機控制電路斷開實現電動機斷電停車，起到過載保護的作用。鑒於雙金屬片受熱彎曲過程中，熱量的傳遞需要較長的時間，因此，熱繼電器不能用作短路保護，而只能用作過載保護熱繼電器的過載保護。
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