The 12-00603 Tripconnect unit for big appliances prevents damage from power surges and dips (brownouts) caused by power shutdowns and over- and under-voltages from unstable power. The 12-00603 Tripconnect unit simply removes power from the equipment in the event of over or under voltage conditions and automatically restore power when the supply falls below acceptable limits. Surge protection and status monitoring as well as a zero voltage switch-on is included for smooth operation. Simply insert the single phase unit between the wall socket and the appliance's power plug.