Abstract: A design of magnetic field actuated sealed electrical contact unit for an electrically operated relay or mechanically operated switch is constructed of metal and plastics laminae (1, 1a, 2, 2a, 5 and 5a) one of which incorporates a diaphragm 10 which functions both as moving contact and armature. In the case of a relay the electromagnetic energizing unit (3, 3a, 4 and 4a) may also be of laminar construction.

Abstract: The apertures in one wall of an electrical component housing through which electrical terminals protrude are sealed with resin. The resin is applied to the housing wall at a remote area and caused to flow by capillary action along grooves to the required locations for sealing the apertures. In the case of a two part housing the parts of which join at the perimeter of the wall having the protruding terminals, the resin may also be caused to flow by capillary action into this join to seal it.

Abstract: An encapsulated electromechanical relay provides both make and break contact functions by utilizing a movable diaphragm for connecting between inner and outer concentric conductors. In a non-energized state the diaphragm provides electrical continuity between one pair of contact members, and in a magnetically energized state the movable diaphragm contact then povides electrical continuity between a second pair of contact members by moving away from the central contact of the first pair and moving into contact with the central contact of the second pair.