IER is one of the leading manufacturers of custom built Manual Transfer Switches. IER offers switches from 30 Amp. - 4000 Amp. All components are UL listed and designed for your safety and long service life with virtually no maintenance required.
IER builds Manual Transfer Switches to meet all NEMA ratings. IER offers switches in both fused and non-fused designs. Our most popular manual transfer switch is built in ANSI 61 gray powder coated steel but we also stock stainless steel, aluminum enclosures and can ship these switches to you in just a couple of days.