FAQ No. FAQ02079
Question
Why do Solid-state Relay (SSR) load Relays
sometimes hum?
Answer
Leakage current flows when the SSR input is OFF. If a small Relay is
driven, this leakage current may cause the Relay coil to become slightly
energized, which results in a humming sound being produced.
Insert bleeder resistance in parallel with the Relay coil to eliminate any
humming. The same effect as bleeder resistance can also be obtained by
connecting multiple Relay coils in parallel or connecting the Relay coil
in parallel with another load.
Other Solid-state Relay
FAQs
 What is the zero cross function?
What is a snubber circuit?
Is it abnormal that the SSR is so hot that I can’t continue touching it?
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