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Member #1608672

Member Since: July 10, 2020

Country: United States

  • Please be aware that most SSRs ( If not all ) have a leakage current so there is a voltage present on switched side of the SSR even when it is in the off condition. This is not a problem for low impedance loads since the current carrying capacity of the SSR in the off state is very low but for voltage sensitive very high impedance loads it can cause a problem and will cause voltage sensing equipment used by electricians to detect "hot" circuits to indicate unsafe.

    Also cheap SSRs can have a very significant series impedance. If used with high current loads ( such as a motor or heating contactors ) a carefully selected heat sink must be used with fan forced cooling ( if needed ).

    One last (??) note SSRs need to have an internal or external "snubber" ( series RC add on ). A rapid transient on the load side of the SSR can trigger it to an "ON" state.

    It is necessary to read the specs and app notes before applying SSRs. ( But it is always necessary to read and understand the specs and app notes for everything - [ don't ask me how I know ] ).

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