Wiring Device-Kellems HBL® Locking Switch, Standard Extra Heavy Duty General Purpose, 120 to 277 VAC, 20 A, 5540 W Power, 2-Position Contact Configuration, 1 Pole, Inductive/Resistive, Non-Cylindrical Lock, Double Ended Key Actuator, Screw Terminal Connection, Composite, Black, Environmental Conditions: -40 to 75 deg C, 4.06 x 1.31 x 1.13 in