The 24H SUR/DINRAIL MNT BAT BU 240V MNL OR The MIL72 Series 24-Hour timer modules are designed to be mounted inside a control panel and can accommodate surface/DIN Rail or flush/panel mounting. The time switches are light-duty commercial switches ideal for 24, 120, or 240 VAC single phase applications, such as lighting control, HVACR, pumps, motors, fan controls, access controls, OEM applications, agricultural facilities, and general purpose electrical circuits.