The 7D ELT-MECHL TMR MOD W/BAT BU 120V Electromechanical Timer Module is designed to be placed inside a machine control panel, circuit board, or other equipment. It offers up to 21 Amp switching designed for control of heating, ventilation, air conditioning, refrigeration, lighting, security, circulating pumps, spas, OEM applications, or any electrical load requiring 7-Day scheduling.