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Question
What should be done about surge-absorbing circuits for AC-load Solid-state Relays (SSRs)?
Answer
Measures against AC Switching SSR Output Noise Surges
1.
The SSR has a built-in snubber circuit to smooth out a sudden rise in voltage. If there is a large voltage surge in the output-side AC power supply, the snubber circuit will not be sufficient to suppress the surge, and overvoltage will damage the output elements.
2.
The following models have a built-in surge-absorbing varistor:
G3NA, G3S, G3PA, G3PB, G3NE, G3J, G3NH, G9H, G3DZ (some models), G3RZ, G3FM
3.
Be sure to take measures against surge when switching an inductive load with an SSR that does not have a built-in surge-absorbing element. (Refer to the following figure.)
Note:
A separate varistor with a surge resistance higher than the built-in varistor must be mounted externally if influence is possible from noise that is not completely absorbed by the built-in varistor (surge resistance: 700 to 1000 A).
Select a surge-absorbing element that meets the conditions in the following table.
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