400 Amp Service Entrance Switchgear NEMA 1/3R
- 400A with 7 multi-voltage configurations
- UL Listed & EUSERC Approved assembly
- NEMA 1 indoor & NEMA 3R outdoor rated
UL 891 Certified
EUSERC Approved
Siemens Approved OEM
DEI Power's 400 Amp Main Breaker Panel category covers a comprehensive range of UL-listed panelboards, switchboards, switchgear, service entrance sections, service entrance switchgear, and meter mains. Built with genuine Siemens components, these panels support voltages from 120/240V to 480V and serve commercial, industrial, and utility applications requiring dependable, code-compliant power distribution.
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For a 400 amp service panel, the NEC typically requires 1000 kcmil copper conductors or 1250 kcmil aluminum conductors per phase for a single-set installation. Many installations use parallel sets of smaller conductors. Always verify conductor sizing with your local electrical code, utility requirements, and a licensed electrician, as installation conditions — including conduit fill, temperature rating, and derating — all affect the final wire size.
Talk to our experts for custom solutions and tailored guidance.
400 amp panels provide reliable main service entrance and branch distribution for offices, retail, and campuses.
Heavy-duty switchgear and switchboards control large electrical loads in plants and processing facilities.
EUSERC-approved service entrance switchgear supports substations and critical utility infrastructure projects.
High-amperage switchgear delivers dependable power distribution for hyperscale and enterprise data centers.
Talk to our experts for custom solutions and tailored guidance.
As an approved Siemens OEM, DEI Power builds every panel with genuine components in a 50,000 sq. ft. California facility, ensuring precision quality and faster lead times.
Every assembly is UL 891 certified and EUSERC approved, meeting UBC, CBC, and IBC seismic requirements — reducing change orders and keeping your project on schedule.
Free shipping with delivery in 3-5 business days, backed by dedicated project support and technical specialists to keep mission-critical power distribution projects moving.
Submit your project details and a DEI Power specialist will respond with configuration guidance, pricing, and lead time within one business day.
For immediate assistance, feel free to give us a direct call at (866) 773-8050. You can also send us a quick email at sales@deipower.com.
For immediate assistance, feel free to give us a direct call at (866) 773-8050. You can also send us a quick email at sales@deipower.com.