An adapter assembly for use with a surgical instrument , comprising: a housing configured to be coupled to a handle assembly ; an elongated body defining a longitudinal axis along a length thereof, the elongated body extending distally from the housing and being configured to be coupled to a surgical loading unit ; a switch assembly disposed within the housing and configured to communicate that the surgical loading unit is coupled to the elongated body, the switch assembly including: a substrate having a top surface and a bottom surface ; a switch mounted on the top surface of the substrate; and at least one wire (W) coupled to the substrate by at least one electrical contact ; and a switch actuator movably disposed within the housing and configured to actuate the switch upon engagement of the surgical loading unit with the elongated body, characterized in that the substrate includes a plurality of dielectric layers disposed between top and bottom surfaces and at least one conductive layer is disposed over at least one of the top surface, the bottom surface, or in between the plurality of dielectric layers and wherein the plurality of layers comprising the plurality of dielectric layers and at least one conductive layer define a first portion and a second portion , the first portion of the plurality of layers having at least one dimension that is different than a corresponding dimension of the second portion of the plurality of layers to define a step , the step providing a cut-out portion disposed at an end of the substrate for attachment of the at least one electrical contact for coupling of the at least one wire, the step having a first planar surface that extends perpendicularly from the top surface of the substrate and a second planar surface extending perpendicularly from the first planar surface and being parallel with the top and bottom surfaces of the substrate. a housing configured to be coupled to a handle assembly ; an elongated body defining a longitudinal axis along a length thereof, the elongated body extending distally from the housing and being configured to be coupled to a surgical loading unit ; a switch assembly disposed within the housing and configured to communicate that the surgical loading unit is coupled to the elongated body, the switch assembly including: a substrate having a top surface and a bottom surface ; a switch mounted on the top surface of the substrate; and at least one wire (W) coupled to the substrate by at least one electrical contact ; and a substrate having a top surface and a bottom surface ; a switch mounted on the top surface of the substrate; and at least one wire (W) coupled to the substrate by at least one electrical contact ; and a switch actuator movably disposed within the housing and configured to actuate the switch upon engagement of the surgical loading unit with the elongated body, characterized in that the substrate includes a plurality of dielectric layers disposed between top and bottom surfaces and at least one conductive layer is disposed over at least one of the top surface, the bottom surface, or in between the plurality of dielectric layers and wherein the plurality of layers comprising the plurality of dielectric layers and at least one conductive layer define a first portion and a second portion , the first portion of the plurality of layers having at least one dimension that is different than a corresponding dimension of the second portion of the plurality of layers to define a step , the step providing a cut-out portion disposed at an end of the substrate for attachment of the at least one electrical contact for coupling of the at least one wire, the step having a first planar surface that extends perpendicularly from the top surface of the substrate and a second planar surface extending perpendicularly from the first planar surface and being parallel with the top and bottom surfaces of the substrate. <EOS>