an interlock device includes a housing and a toggle interlock mechanism with an extendable interlock pin . the interlock device also includes a preassembled switch , an electromechanical device , and a lead frame interconnecting the switch and electromechanical device . the lead frame conductors are formed as one piece , but are separated after assembly into the housing . the conductors and mating components include mating non - releasable contacts that telescope together in a manner that forms a robust assembly and that facilitates automation of the assembly process . a method related to the above is also disclosed .