Medium voltage, generally identified as voltages from 601 to 15000 volts, includes equipment such as air circuit breakers, oil circuit breakers, vacuum circuit breakers, SF6 circuit breakers, large motor starters, ground and test devices, load break switches, reclosers along with their related metering and control components.

ESI performs various services to equipment of this type. These services include complete re-manufacturing, retrofitting, field conversions, retro-filling, upgrading and match and line up switchgear projects, as well as the supply of new, discontinued, or obsolete equipment.