Thermostat, 120/208/240/277V AC, Heat Only, 2 3/16 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