400A 208Y/120V Panelboards — Main Lug, 3-Phase

A main lug panelboard lacks a built-in main circuit breaker and relies on an upstream protective device for overcurrent protection. A main breaker panelboard includes an integrated main breaker that serves as both the service disconnect and overcurrent protection. Main lug panels are commonly used as sub-panels or in applications where the disconnect is located elsewhere.

These panelboards are available in NEMA 1 (indoor) and NEMA 3R (outdoor, weather-resistant) enclosures. NEMA 1 is suited for dry indoor environments, while NEMA 3R provides protection against rain and ice, making it appropriate for covered outdoor installations. The correct rating must be selected based on the installation environment.

Yes. DEI Power's 400A 208Y/120V panelboards are UL listed assemblies, ensuring compliance with applicable electrical codes. Products also carry UL 891 certification for low-voltage switchgear and are EUSERC approved. All assemblies meet UBC, CBC, and IBC requirements for all seismic zones, supporting installations across the United States.

These panelboards are used in commercial buildings, industrial facilities, utility infrastructure, data centers, healthcare facilities, and critical power environments. They are suited for branch circuit distribution where a 208Y/120V 3-phase supply is required, including office buildings, manufacturing floors, colocation facilities, and campuses where sub-panel distribution is needed.

Most orders ship within 1 business day from DEI Power's 50,000 sq. ft. facility in Ontario, California, with standard delivery in 3–5 business days. Built-to-order configurations typically carry 4–6 week lead times. Free shipping is included on all orders. Emergency and rush orders are supported from in-stock inventory where available.

Yes. DEI Power's 400A 208Y/120V panelboards meet UBC, CBC, and IBC requirements for all seismic zones. This makes them suitable for installations in seismically active regions, including California and other high-risk areas, where compliance with seismic standards is mandated by local building codes and utility specifications.