How do you identify terminals of 5 pin relay?

To identify the terminals of a 5-pin relay, refer to the relay's datasheet or pinout diagram, which provides specific information about the function of each terminal. Typically, the pins include two for the coil (often labeled A1 and A2) and three for the contacts (Common, Normally Open, and Normally Closed). You can also use a multimeter to check for continuity between the contacts when the relay is energized. In the absence of a datasheet, a visual inspection of the relay's internal structure may help in determining the layout of the pins.