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Eaton Main Terminal Box 400A Three-Phase 120/208V NEMA 3R Aluminum Four-Wire Overhead Underground
Professional Electrical Power Distribution Terminal Box
The Eaton Main Terminal Box delivers exceptional electrical power distribution performance for three-phase 120/208V overhead and underground applications. This 400A four-wire terminal box provides reliable electrical connection and distribution designed for professional electricians, electrical contractors, and utility professionals, offering the proven reliability and advanced technology that professionals trust from the global leader in intelligent power management.
Professional Features & Benefits
High-Capacity Power Distribution
- 400A Current Rating - High-capacity electrical distribution for demanding three-phase commercial and industrial applications with reliable power handling
- Three-Phase 120/208V Configuration - Optimized voltage rating for standard commercial electrical systems with balanced power distribution
- Four-Wire Design - Complete three-phase plus neutral configuration for comprehensive electrical distribution and grounding
- Aluminum Bus Construction - Lightweight yet durable aluminum bus material provides excellent conductivity and corrosion resistance
Weather Protection & Installation
- NEMA 3R Enclosure Rating - Weather-resistant protection against rain, sleet, and ice formation for reliable outdoor installation
- Overhead/Underground Compatibility - Versatile installation options for both aerial and buried electrical distribution systems
- UL Listed Certification - Meets rigorous safety standards for professional electrical installations and code compliance
Technical Specifications
Current Rating: 400A, Voltage Rating: 120/208V, Phase Configuration: Three-phase, Wire Configuration: Four-wire, Bus Material: Aluminum, Enclosure Rating: NEMA 3R, Wire Size Compatibility: (1) #6 AWG-600 kcmil, (2) #1/0 AWG-250 kcmil, Feed Type: Top/bottom, Dimensions: 13.5" W x 7.5" H x 6.5" D, Weight: 54 lb, Certifications: UL Listed, Utility Approvals: MI Consumers Energy
Installation & Usage
- Verify proper NEMA 3R mounting location with adequate clearances for overhead or underground feed connections
- Install terminal box using appropriate mounting hardware for secure attachment to utility pole or underground vault
- Connect incoming utility feeds to primary terminals using specified wire size ranges and proper torque specifications
- Install compression lug landing kits (order 3MTB1200CLK separately) for three-phase and neutral connections
- Route outgoing distribution conductors through appropriate knockouts maintaining proper bend radius
- Verify all connections are tight and properly insulated before energizing the electrical system
Professional Applications
Ideal for:
- Utility Distribution Systems - Primary connection point for three-phase power distribution in overhead and underground utility networks
- Commercial Building Services - Main electrical service entrance for commercial facilities requiring 400A three-phase power capacity
- Industrial Power Distribution - Heavy-duty electrical distribution for manufacturing facilities and industrial complexes
- Multi-Tenant Buildings - Central power distribution for apartment complexes, office buildings, and mixed-use developments
- Municipal Infrastructure - Electrical distribution for streetlighting, traffic systems, and public facility power distribution
- Construction Sites - Temporary power distribution for large construction projects requiring three-phase electrical service
- Agricultural Operations - Power distribution for farm facilities, irrigation systems, and agricultural processing equipment
- Telecommunications Sites - Reliable power distribution for cell towers, data centers, and communication infrastructure
NEMA 3R Weather Protection Advantage
The NEMA 3R enclosure rating provides essential weather protection for outdoor electrical installations, preventing rain, sleet, and ice damage while maintaining reliable electrical connections. This weatherproof design ensures long-term performance in harsh environmental conditions, reducing maintenance requirements and extending equipment life for professional electrical systems.
Why Choose Eaton Quality?
Eaton's century-plus experience in electrical power management innovation delivers unmatched reliability for professional electrical distribution applications. With comprehensive UL listings, utility approvals, and trusted performance for electricians, electrical contractors, and utility professionals worldwide, Eaton main terminal boxes provide the quality construction and dependable electrical performance that professionals demand for critical power distribution systems.
Manufacturer Resources
Product Specs
- Amperage Rating:
- 400A
- Bus Material:
- Aluminum
- Catalog Notes:
- For compression lug landing kits, order 3MTB1200CLK (includes landings for 3-phases and neutral).
- Certifications:
- UL Listed
- Enclosure:
- NEMA 3R
- Feed Type:
- Top/bottom
- Number Of Wires:
- 4
- Phase:
- Three-phase
- Product Height:
- 7.5 in
- Product Length Depth:
- 6.5 in
- Product Weight:
- 54 lb
- Product Width:
- 13.5 in
- Utility Approvals:
- MI : Consumers Energy
- Voltage Rating:
- 120/208 V
- Wire Size:
- (1) #6 AWG-600 kcmil, (2) #1/0 AWG-250 kcmil
- Product Type:
- Main Terminal Box
- Product Group:
- Electrical
- Department:
- Electrical