Wiring – AC Gearmotor 115 Nameplate RPM 4.0 RPM Max. Torque 75.0 in-lb trips breaker when switch is turned off

To whom it may concern, I recently purchased a Dayton AC Gearmotor 115 Nameplate RPM 4.0 RPM Max Model #
52JE07. Torque 75.0 in-lb. The gear motor is single phase with two wires L1 and L2 respectively with no ground. I wired this into a 20 amp industrial switch. From the switch is 10 feet of 14 gauge extension cord to plug to my outlet. When I turn the switch to off, it blows the 20 Amp circuit breaker in my box every time. This motor does not require a capacitor according to the technical specs provided by Dayton. I did not ground the plug nor the switch as the motor is two wire. I switched neutral and hot on the switch and vice versa from the L1 and L2 terminals with absolutely no change. There are GFCI outlets in the circuit where I am plugging into. They do not trip, only the main breaker. I can turn the motor off and on by tripping the GFCI breaker on the next outlet leaving the switch on. As soon as I turn the switch off, trips the breaker. My question is, should I wire ground to neutral on the switch from my plug wire? Any ideas of what could be causing this?