The Electronic 24-Hour/7-Day Timer Module, Surface/DIN Rail Mount, 16A, 12VDC One Channel Electronic Time Switches are compact 24-Hour/7-Day modules with heavy-duty relay contacts for switching low or line voltage loads. The time switches are applicable for time-of-day control of pumps, fans, heaters, HVAC control circuits, lighting, machinery, and many other types of commercial, industrial, and agricultural equipment.