Electromagnetic switch for engine starter

An electromagnetic switch for use in a starter to start an engine comprising:

• a frame which has a given length with a first end and a second end opposite the first end, the first end defining a bottom of the frame, the second end having an opening;
• a first solenoid which includes a first coil which is wound around a first bobbin and disposed closer to the first end of the frame, the first bobbin having a first end facing the first end of the frame and a second end facing the second end of the frame, the first coil working to produce a magnetic force to move a pinion of a starter toward a ring gear of an engine;
• a second solenoid which includes a second coil which is wound around a second bobbin and disposed closer to the second end of the frame than the first bobbin is, the second bobbin having a first end facing the first end of the frame and a second end facing the second end of the frame, the second coil working to produce a magnetic force to close main contacts installed in a power supply circuit for an electric motor which serves to rotate the pinion;
• first and second lead wires extending from the first coil outside the second end of the first bobbin, at least the first lead wire passing radially inside an inner periphery of the second coil and extending toward the second end of the frame;
• and
• a lead-wire retainer integral with the first bobbin and which extends from the second end of the first bobbin in an axial direction of the first bobbin at least to a location of an air gap formed radially inside the second solenoid in a magnetic circuit of the second solenoid to retain the first lead wire,
• wherein the second lead wire of the first coil passes radially inside the inner periphery of the second coil and extends toward the second end of the frame, and further comprising a second lead-wire retainer which retains the second lead wire.