Macromatic VWKPU voltage band relay. Monitors any 208-240 Volt AC single phase voltage. Provides voltage band (window) protection. Wide range of user-adjustable Over Voltage and Under Voltage settings. Adjustable time delay on both pick-up & drop-out. LED indicates output relay status. Compact plug-in case utilizing industry standard 8 pin octal socket. 10A SPDT output contacts.