Abstract: A coil bobbin for a sub-fractional horsepower motor is formed with a cavity in one flange opening outward from the flange rim, a partition dividing the cavity into two chambers. One chamber has a cross-sectional shape adapted to receive a thermal sensing device and the other has a cross-sectional shape adapted to receive an insulated terminal wire. The thermal device has a metal body as one terminal of the device and a projecting rectangular metal portion as the other terminal. One start wire of the coil is wound around or otherwise secured to the projecting terminal and the thermal device is inserted into one chamber from the open end. The partition is partially slotted and the stripped end of the lead wire is inserted in the other chamber from the other end, the stripped and bent-over end of the lead wire extending through the slot. As the thermal device is pushed into its chamber its metal body forces the stripped end against the partition and into electrical connection with the stripped end.