Abstract: A one-piece molded adaptor comprises a rectangular frame having inwardly directed ledges on opposed lateral legs cooperably engagable with projections on a contactor housing normally intended to interlock with an auxiliary contact block housing. The frame fits firmly over a rectangular protrusion of the contractor housing to securely lock the adaptor to the contactor. A depending cantilever portion provides a laterally offset portion overlying a reset plunger of an overload relay and provides a finger-engagable pushbutton portion offset from the plunger and centrally located relative to the starter panel footprint to mimic the reset button location of earlier generation starters.

Abstract: A thermal overload relay for a three-phase power supply circuit having an auxiliary normally open (N.O.) or a normally closed (N.C.) contact unit (FIG. 5, FIG. 6) selectively addable in the field. The relay is provided with the standard normally closed contact by way of a subassembly (20) that is installed by the manufacturer for circuit protective purposes and a slot (12p) and securing means (12n, 77) alongside this subassembly for receiving an auxiliary contact unit (57) that can be inserted and secured by a screw (77) in the field. A contact operating lever (54) is constructed so that it will actuate the auxiliary contact unit (57) at the end of the trip stroke thereby affording redistribution or retiming of the spring forces that will enhance the tripping function because less initial spring force is required at the beginning of the trip stroke. The N.O. and N.C.