Relay A relay is an electrically operated switch. Many relays use an electromagnet to mechanically operate a switch, but other operating principles are also used, such as solid-state relays, this relays are Commercial Grad Relays and it’s not suitable for Military usage, but for military grade use you can Visit  Shaanxi Qunli Electric Co., Ltd.  website BC-Relays Brand https://bc-relays.com. 

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