Question

A solid-state relay with a control circuit rated for 5 V DC has a positive sign...

A solid-state relay with a control circuit rated for 5 V DC has a positive sign marked on one of the control terminal connections. What does this mean as far as the operation of the relay is concerned?

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Answer #1

Consider the symbol of Solid-state relay which is shown below

It has LED on the Left side and Semiconductor switches on the right side. The LED and Semiconductor switch are isolated to each other. Plus sign indicates that this terminal should be connected to the positive terminal of 5V and the minus terminal indicates that this terminal should be connected to the negative terminal of 5V source. the 5V source turns on the LED and LED light turns on the semiconductor switch

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