Thermostat 120/208/240/277V AC Heat Only 2 1/4 in Overall Depth 1 3/4 in Overall Height 1 in Overall Width Maximum Control Temperature 90 Degrees F Minimum Control Temperature 40 Degrees F Compatible Grainger Part Number 3UG55 3UG56 3UG57 Compatible Manufacturer Model Number All LFK Series Compatible System Type Electric Heaters Number of Poles 2 Housing Color Black Mounting Type Unit Mount Switch Action Open on Rise DPDT Mechanical Selector Dial