Reed 4 Pin Relay Wiring Diagram. An electrically latched relay is a standard relay with one of its own contacts wired into its coil circuit. 87 and 87a are the two contacts to which 30 will connect.
3V Relay 12V Relay 1-channel Relay module 4-channel Relay Module. ISO relays are currently used by almost all. Example relay wiring schemes.
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85 and 86 are the coil pins while 30 87 and 87a are the contact pins. There are all sorts of creative applications for reed switches. There are two kinds of latching relays. Let us learn how to use one in our circuits based on the requirement of our project.