Welcome to
IER-Manual Transfer Switches
Solutions with Integrity

IER is one of the leading manufacturers of custom built Manual Transfer Switches. 30 AMP - 4000 AMP Manual Transfer Switches in Stock ready to ship, Fused, Non-Fused, 240 Volt AC and 600 Volt AC, NEMA 1, 3R and NEMA 4X Available. All components are UL listed and designed for your safety and long service life with virtually no maintenance required.