Abstract: Electromagnetically operated contactor or relay in which the stationary magnetic core and operating coil are mounted in a base section and the movable armature and the switching elements are mounted in a main frame section. With the two sections assembled together the pole face structures of the stationary core abut reference surfaces in the main frame section. When the operating coil is energized, the armature moves into contact with the pole faces of the stationary core. Thus, since the reference surfaces in the main frame section determine the position of the stationary core pole faces and hence the position of the armature when the core is energized, the positions of all movable elements are determined solely by dimensions of the main frame section independently of the base section.

Abstract: Electromagnetically operated contactor or relay employing contact modules which are removably mounted in either of two positions respectively providing normally open and normally closed contact conditions. One set of contact modules is mounted in a main frame and a second set is mounted in an upper frame which overlies the main frame and obscures the first set of contact modules. Transparent viewing members extend through apertures in the upper frame. Each transparent viewing member has a viewing surface exposed externally of the upper frame and an image transmitting surface adjacent to a contact module of the underlying first set. Each contact module has two light reflecting surface areas which are distinguishable from each other, one or the other being adjacent to the image transmitting surface of the associated transparent viewing member depending upon the position of the contact module.

Abstract: Electromagnetically operated contactor employing contact modules which are converted from normally open to normally closed and from normally closed to normally open operation by inverting the contact module in the contactor. The contact terminals of the contact module are clamped by various arrangements against conductive members of the contactor. Wiring terminals for connecting external wiring to the conductive members are spaced from the arrangement for clamping the contact terminals to the conductive members. Thus, the wiring terminals and the external wiring do not interfere with the module or arrangement for clamping, and the module may be removed, inverted, and replaced without disturbing the external wiring connections.

Abstract: An electrical relay having a reciprocally driven contact carrier of insulating material on which movable contacts are mounted. The contact carrier is treated with an antistatic surfactant to provide a coating which prevents the buildup of an electrostatic charge. Since a charge does not build up on the contact carrier and the movable contacts, they do not attract nonconducting contaminating materials which otherwise would collect on the surfaces of the contacts interfering with the making of proper electrical connections.