Guides, Specs & Answers

Low-voltage switchgear is a metal-enclosed assembly that distributes, protects, and controls electrical power below 1,000 volts. It sits between a facility’s service entrance and its downstream panels, providing fault interruption, isolation, and metering for the entire building load.

Switchgear uses drawout, individually compartmentalized power circuit breakers rated for service-entrance-grade short-circuit duty (UL 1558). Switchboards use fixed-mount breakers, are typically lighter-duty (UL 891), and cost less — appropriate for smaller commercial loads but not for critical or large industrial service.

An E-house is a factory-built, fully wired modular building containing switchgear, controls, protective relays, and auxiliary systems. It ships to site as a single tested unit, compressing field installation time from months to weeks and reducing on-site labor and weather risk.

Yes. Every Millennium lineup is engineered to your single-line diagram, short-circuit study, and site conditions — voltage class, breaker frames, protective relay scheme, controls, and enclosure are specified per project rather than pulled from a catalog.

Yes. We build switchgear, paralleling controls, and modular power distribution for Tier III and Tier IV data centers, including 2N and 2(N+1) topologies, generator paralleling, automatic transfer schemes, and UPS-fed distribution down to the row.

Data centers, industrial and manufacturing, utilities and energy, healthcare, and commercial and infrastructure projects. Our application engineers transfer experience between markets.

Our equipment is built to UL 1558 (low-voltage metal-enclosed switchgear), UL 891 (switchboards), ANSI C37 (medium-voltage), IEEE 1584 (arc-flash), and the National Electrical Code. We can support full short-circuit, coordination, and arc-flash studies as part of the engineering package.

Lead times depend on voltage class, breaker availability, and project scope. Most custom low-voltage switchgear lineups run 20–30 weeks; medium-voltage and integrated E-house projects typically run 30–40 weeks. We provide a firm schedule with the engineering quote.

Yes. Our field service team handles installation supervision, commissioning, protective-relay setting, and start-up. Offices in Beachwood, OH and Newnan, GA support sales and service techs throughout the country support customers who need service, whether it is a Millennium power system or not.

Our power systems are manufactured in the United States, with a coordinated counterpart serving the German and broader European market through the Grenzebach Group.

Founded as Millennium Control Systems, we have consulted, engineered, manufactured and serviced customers in the United States for nearly 30 years.