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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：它能夠添加觸點的數量和傳遞信號。

Central relay實物圖，如下

Current relay

Current relay，望文生義就是依據電流信號來到達操控線路通斷。它有過電流繼電器和欠電流繼電器，也有同時具有過電流和欠電流功用。比方為了維護某個設備設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望文生義就是這個繼電器是一塊整體，中心沒有觸點。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，所以能夠實現頻頻接通與斷開而且不會發生電弧，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生熱量來到達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，當電流經過雙金屬片會發生熱量。雙金屬片受熱膨脹曲折，然后推動連桿，然后讓輔佐觸頭接通與斷開。

Article source: Zhongshan Relay Manufacturer www.odbsnvlol.cn