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There are many commonly used relays, such as center relays, time relays, current relays, voltage relays, speed relays, thermal relays, solid-state relays, spring closing relays, and so on.

We need to select different relays based on our needs. For example, if you need to control the time, use a time relay; if you need to control the circuit on or off based on the voltage, use a voltage relay; if you need to control the circuit on or off through a magnetic field, use a reed relay, and so on.

Central relay

Central relay和溝通接觸器原理類似，僅僅它比溝通接觸器少了主觸頭，所以這就決定了它不能通斷大電流。中心繼電器首要效果：它能夠添加觸點(diǎn)的數(shù)量和傳遞信號(hào)。

Central relay實(shí)物圖，如下

Current relay

Current relay，望文生義就是依據(jù)電流信號(hào)來到達(dá)操控線路通斷。它有過電流繼電器和欠電流繼電器，也有同時(shí)具有過電流和欠電流功用。比方為了維護(hù)某個(gè)設(shè)備設(shè)備因電流過大而焚毀，就能夠選用電流繼電器。

Solid state relay

Solid state relay望文生義就是這個(gè)繼電器是一塊整體，中心沒有觸點(diǎn)。它首要是由電子電路組成，輸入電路與輸出電路之間選用光電阻隔。別的由于它無觸點(diǎn)，所以能夠?qū)崿F(xiàn)頻頻接通與斷開而且不會(huì)發(fā)生電弧，能夠適用于易燃易爆場所。

Thermal relay

Thermal relay，望文生義就是依靠電流發(fā)生熱量來到達(dá)接通與斷開操控線路的意圖。熱繼電器主觸頭是由兩種不同材料的金屬片組成，當(dāng)電流經(jīng)過雙金屬片會(huì)發(fā)生熱量。雙金屬片受熱膨脹曲折，然后推動(dòng)連桿，然后讓輔佐觸頭接通與斷開。

Article source: Zhongshan Relay Manufacturer qzjyw.com