Vienreizējs spole
DC relejiem var būt viena vai divas spoles . DC relejus var iedalīt šādos veidos atbilstoši to struktūrai un darba principam:
Single coil DC electromagnetic relay: This relay has only one coil. When DC current passes through the coil, the magnetic field generated by the coil attracts the armature to close or open the contacts. Single coil DC electromagnetic relays have the advantages of simple structure, low cost, and rapid action, but there are problems such as unstable attraction and uzņēmība pret traucējumiem .
Dual Coil DC elektromagnētiskais relejs: Šim relejam ir divas spoles . Magnētiskie lauki, ko ģenerē abas spoles, atceļ viens otru . tikai tad, kad strāvas, kas iet caur abām spolēm, ir vienādas un pretējas virziena virzienā Stabila pievilcība un spēcīga pretkonferences spēja, bet struktūra ir sarežģīta, un izmaksas ir augstas .
Differential DC electromagnetic relay: This relay achieves the attraction or release of contacts by comparing two DC currents of different sizes. Differential DC electromagnetic relays have the characteristics of strong anti-interference ability and high precision, and are widely used in precision control systems.