Trion 138586 ON-OFF switch. This switch is the on-off switch at the front panel.
SPST (single pole, single throw). Has two 1/4" spade terminals. Fits in a rectangular hole slightly larger than 1-1/8 x 1/2 inch. Rating 16 amp at 125 vac or 10 amp at 250 vac.
This switch is used in Trion HE, SE and many Trion models.