Abstract: A bridge switch consists of a fusible link between two balanced electrical loads connected in parallel. This fusible link stops a movable member from completing a secondary circuit. When that fusible link is destroyed the movable member is allowed to close the electrical contact(s) that will cause power to go to a secondary circuit. When one side of the parallel circuit to which the bridge switch is connected fails causing current to flow through the fusible link at a rate high enough to destroy that link allowing the movable member to activate the secondary circuit and/ or removing power from the primary circuit. More than one bridge switch may be employed in the total circuit where the second bridge switch is connected across two elements of the secondary circuit with the movable member restoring power to the primary parallel circuit without removing it from the secondary parallel circuit. This would then create a third parallel circuit.