400A Circuit Breakers

400A refers to a current capacity of 400 amperes — the maximum continuous electrical current the breaker or service entrance assembly can safely carry. In commercial and industrial settings, a 400A service is a common entry-level rating for buildings or systems with significant power demands, such as HVAC systems, manufacturing equipment, or multi-tenant facilities.

For commercial and industrial use, look for UL Listed or UL 891 certified assemblies, EUSERC approval for utility-facing installations, and compliance with seismic requirements (UBC, CBC, IBC) if located in seismic zones. DEI Power's 400A assemblies carry all three certifications, ensuring code compliance across most U.S. jurisdictions.

DEI Power's 400A assemblies are available in multiple voltage configurations including 120/240V, 208Y/120V, 240V/240/120V, 480V, 480Y/277V, and 415/240V. This flexibility allows contractors and engineers to specify equipment that matches their exact utility and facility requirements without custom fabrication delays.

Yes. DEI Power's 400A assemblies are available in both NEMA 1 enclosures for indoor installations and NEMA 3R enclosures for outdoor, weather-resistant applications. NEMA 3R enclosures protect against rain, sleet, and ice, making them suitable for pad-mount or outdoor service entrance installations in commercial and utility environments.

Yes. Service entrance switchgear and service entrance sections (SES) must be built to your local utility's approved specifications, as requirements vary by utility provider. DEI Power offers specialist consultations to ensure each assembly is configured to the correct utility standards before manufacturing, preventing costly field rejections or change orders.

Most DEI Power 400A assemblies ship within 1 business day, with standard delivery in 3–5 business days. Free shipping is included on all orders. For utility-spec service entrance equipment requiring custom configuration, lead times may vary — contact a DEI Power specialist for project-specific timelines and coordinated delivery planning.