M25R-14ICD 

M25R-14ICD 

M25R-14ICD 

:熔斷器在電氣線路中主要起短路保護(hù)和嚴(yán)重過載保護(hù)作用，而熱繼電器主要用于過載保護(hù).兩者不能互為代用，但可以互為補(bǔ)充.如果用熔斷器作電動機(jī)的過載保護(hù)，為了防止電動機(jī)在啟動過程中熔斷器熔斷，熔斷器熔體的額定電流一般應(yīng)取電動機(jī)額定電流的2. 5~3倍，這樣即使電動機(jī)長時(shí)間過負(fù)荷50%，熔斷器也不會熔斷，而電動機(jī)可能因長時(shí)間過負(fù)荷而燒壞.所以不能用熔斷器作過負(fù)載保護(hù).而熱繼電器是利用電流的熱效應(yīng)來工作的，由于熱慣性的影響，盡管發(fā)生短路時(shí)電流很大，也不可能使熱繼電器立即動作，這樣就延長了短路故障的影響時(shí)間，對供電系統(tǒng)及用電設(shè)備會造成危害.所以也不能用熱繼電器作為短路保護(hù).

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