3-Phase Circuit Breaker Panels | Three-Phase Breaker Solutions

A 3-phase breaker monitors current across all three power phases simultaneously. When an overload, short circuit, or fault is detected on any phase, the breaker trips and simultaneously disconnects all three phases to prevent equipment damage and ensure safety. This coordinated operation protects motors, data center equipment, industrial machinery, and other three-phase loads from unbalanced or dangerous conditions.

DEI Power offers 3-phase circuit breaker panels from 400A through 4000A, including 400, 600, 800, 1000, 1200, 1600, 2000, 2500, 3000, and 4000 amp configurations. Remote Power Panels are available in 225A, 400A, 600A, 800A, 1200A, and 1600A ratings, covering a wide range of commercial, industrial, data center, and utility applications.

DEI Power's 3-phase panels support multiple voltage configurations including 120/240V, 208Y/120V, 240V, 240/120V, 480V, 480Y/277V, and 415/240V. Both single-phase and three-phase, 4-wire configurations are available, making these panels suitable for diverse commercial, industrial, data center, and utility electrical systems across the USA.

Yes. All DEI Power panels are UL 891 certified for low-voltage switchgear and switchboard applications. They also meet UBC, CBC, and IBC seismic zone requirements and carry EUSERC approval for service entrance applications. As an approved Siemens OEM, every assembly uses genuine Siemens components and adheres to strict quality control standards for full code compliance.

A panelboard is a compact distribution enclosure for branch circuit protection, typically used in commercial buildings. A switchboard is a larger assembly for metering, distribution, and main overcurrent protection at higher amperages. Switchgear provides the highest level of protection and isolation, used in utility, industrial, and data center environments where reliability and service continuity are critical.

Most in-stock panels ship within 1 business day from DEI Power's 50,000 sq. ft. Ontario, California facility, with delivery in 3–5 business days nationwide. Built-to-order and custom configurations typically have 4–6 week lead times. Emergency and rush orders are supported for data center replacements and time-critical projects. Free shipping is included on all orders.