Range 120/277 VAC (20 amps max per switch), UL 508 Listed Compatible with all Infratech CD-Series & WD-Series heaters Available in single or dual wall plate, flush mount or surface mount options, with or without weatherproof cover or box Expert configuration and installation required, please consult a licensed electrician All components proudly made in the USA and supported by Infratech’s exclusive Three Year Warranty Designed for use with all dual element heaters, the Duplex Stack Switch is the low cost control option for Infratech CD or WD-Series heaters. The Duplex Stack switch allows the ability to turn on and off each heating element independently, providing half power/ full power capabilities.