400A 208Y/120VAC 3-Phase Panelboards — NEMA 12

A 400A 3-phase panelboard connection refers to a panel rated for 400 amperes of total current capacity across three phases. In the 208Y/120VAC configuration offered by DEI Power, the panel accepts a 3-phase, 4-wire input (three hot legs plus a neutral) and distributes that power across multiple branch circuits — supporting both single-phase 120V and three-phase 208V loads simultaneously in commercial and industrial environments.

These panelboards are specifically configured for 208Y/120VAC 3-Phase, 4-Wire power distribution. This is the most common voltage system for commercial buildings, data centers, and colocation facilities in North America, supplying both 120V single-phase loads and 208V three-phase equipment from the same panel.

NEMA 12 is an indoor enclosure rating that protects against dust, dirt, dripping non-corrosive liquids, and light splashing. It is suitable for industrial and commercial indoor environments where the panelboard may be exposed to airborne particulates or incidental moisture, but not direct water spray or outdoor weather conditions.

Yes. All DEI Power 400A panelboards are UL 891 certified and UL Listed for safety and code compliance. They are also EUSERC Approved and meet UBC, CBC, and IBC seismic requirements for all seismic zones, making them suitable for projects across the United States including seismically active regions.

In-stock units ship within 1 business day from DEI Power's Ontario, California facility and arrive at the job site in 3–5 business days. Built-to-order and custom configurations carry a typical lead time of 4–6 weeks, which is significantly faster than the industry-standard 14–16 week lead times common among other manufacturers.

Yes. All DEI Power panelboards are manufactured and assembled domestically at their 50,000 sq. ft. facility in Ontario, California. This domestic manufacturing meets Build America Buy America (BABA) requirements, making them eligible for federally funded and public sector projects.

DEI Power's 400A NEMA 12 panelboards are purpose-built for data centers and colocation facilities, healthcare facilities, commercial buildings, and industrial and manufacturing environments. The 208Y/120V configuration supports server rack power distribution, imaging and life-safety medical equipment, office and campus facilities, and dust-resistant power distribution on manufacturing floors.