PROSOFT  MVI46-MCM熱繼電器主要是保護(hù)三相電動(dòng)機(jī)在運(yùn)行時(shí)，由于某種原因出現(xiàn)過(guò)載，工作電流超過(guò)熱繼電器的額定值，熱繼電器的熱敏元件受熱彭帳，驅(qū)動(dòng)開關(guān)動(dòng)作斷開電源，保護(hù)電機(jī)。

　　熱繼電器種類凡多在此不作多敍，用戶可根據(jù)不同需要去選擇自己需要的熱繼電器。

　　具我所知熱繼電器從零點(diǎn)幾安至幾百安等各種規(guī)格樣樣具全，同時(shí)本身還具有調(diào)節(jié)功能。

　　選擇繼電器時(shí)要根據(jù)需求去選擇不同規(guī)格、型號(hào)的繼電器。

PROSOFT  MVI46-MCM三相電動(dòng)機(jī)，它的滿載電流為20A（一個(gè)千瓦為2A）應(yīng)選0一20A的熱繼由器。

　　我個(gè)人認(rèn)為：造擇熱繼電器的大電流不應(yīng)超出負(fù)載電電流，因?yàn)闊崂^電器的熱敏元件需要的預(yù)熱過(guò)程。如果太大再加上的預(yù)熱過(guò)程就難以起到到保護(hù)作用。

　　個(gè)人所見：不論三相電機(jī)功率大或小，為了預(yù)防過(guò)載都應(yīng)按裝熱繼電器，並不存在多少千瓦才需按裝的說(shuō)法。在按裝規(guī)范中，也從來(lái)沒有規(guī)定低于3KW以下的三相電機(jī)不需要按裝熱保護(hù)的規(guī)定。

　　哪怕是0.5Kw的三相電動(dòng)機(jī)，為了過(guò)載保護(hù)都可以按裝，它僅僅只是為了往護(hù)電機(jī)，而又對(duì)其它電路或電器又沒有任何影響，為何不可為呢？電機(jī)功率越小過(guò)載能力越差，更應(yīng)該按裝熱繼電器進(jìn)行保護(hù)。

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