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How To Choose Solid State Relay?

Hits:Updated:2019-04-26 16:04:36【Print】

The type of solid state relay is selected: Firstly, the power type of the solid state relay should be correctly selected according to the type of the controlled circuit power supply to ensure the normal operation of the application circuit and the solid state relay. If the power supply of the controlled circuit is AC voltage, AC solid state relay (AG-SSR) should be used.

If the power supply of the controlled circuit is DC voltage, DC solid state relay (DC-SSR) should be used. If an AC solid state relay is selected, an active AC solid state relay or a passive AC solid state relay should be selected according to the structure of the application circuit.

Select the load capacity of the solid state relay: The output voltage and output current of the solid state relay should be selected according to the power supply voltage and current of the controlled circuit. The output voltage of the general AC solid state relay is AC20 ~ 380V, the current is 1 ~ 10A; the output voltage of the DC solid state relay is 4 ~ 55V, the current is 0.5 ~ 10A. If the current of the controlled circuit is small, a low power solid state relay can be used.

Conversely, high power solid state relays should be used. The selected relay should have a certain power margin, and its output voltage and output current should be higher than 1 times of the controlled circuit power supply voltage and current. If the controlled circuit is an inductive load, the output voltage and output current of the relay should be more than twice the voltage and current of the controlled circuit.

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