A mains filter should be used to protect the controller against severe mains power supply interference. The filter should be fitted as close to the controller as possible and be connected by short safe-to-touch leads. It is of paramount importance that the mains filter is earthed. Please note that a small current will flow through the filter circuit at all times.
The mains power to consumers switched by the controller must never be supplied from the controller side of the mains filter.
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