Mains Polarity Changeover Switch With Audible Alarm Checks polarity on continental sites and enables the polarity to be quickly switched over.. The mains polarity changeover switch is installed between mains inlet socket and mains distribution/transformer unit. Before plugging into a continental hook-up, if red light shows, simply change switch to show green light for safety. Click here for an example of fitting instructions  Very useful to use with hook up leads Keywords - hookup hook-up
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