Eaton 400A Fusible Switch, Aluminum Bus, NEMA 3R, Class T

Eaton 400A Fusible Switch, Aluminum Bus, NEMA 3R, Class T

Eaton's 400A Fusible Switch is a heavy-duty main disconnect built for demanding single-phase electrical service applications. Featuring an aluminum bus, a NEMA 3R rated enclosure suited to outdoor and wet-location installation, and Class T fuse clips, this switch delivers a 100 kAIC interrupt rating for reliable overcurrent protection. Rated 120/240V for three-wire, single-phase service, it accepts (1) #750 kcmil conductor per phase, making it well suited for main service entrance and multi-family metering applications.

Key Features

• Amperage Rating: 400A fusible switch for high-capacity service entrance applications.
• Durable Construction: Aluminum bus construction for dependable current-carrying performance.
• Fuse Clip Type: Class T fuse clips deliver compact, high-performance overcurrent protection.
• Interrupt Rating: 100 kAIC rating supports safe operation under high fault-current conditions.
• Wire Configuration: Three-wire, single-phase, 120/240V service; line rated for (1) #750 kcmil.
• Enclosure: NEMA 3R rated enclosure for outdoor and wet-location installations.
• Barrier Kit Compatible: Barrier kits available for 400A-800A fusible switches — Bottom feed 3MFSBBK, Top feed 3MFSTB.
• Fuse Clip Upgrade Path: Class H fuse clips available via catalog number WCG3HK400 (order (1) per phase); Class R requires WCG3HK400 plus DS56FK, converting first to Class H.

Certifications & Compliance

• UL Listed
• NEMA 3R Rated Enclosure

Technical Specifications

• Number of wires: 3
• Department: Electrical
• Voltage rating: 120/240 V
• Amperage Rating: 400A
• Phase: Single-phase
• Bus material: Aluminum
• Fuse clip type: Class T
• Line: (1) #750 kcmil
• Interrupt rating: 100 kAIC
• Enclosure: NEMA 3R

Typical Applications

• Commercial and Industrial Electrical Service Entrances
• Multi-Family and Multiple Metering Installations
• Panelboard and Load Center Main Disconnect Switching
• Outdoor and Wet-Location Installations
• Renovation and New Construction Electrical Upgrades

Why Eaton?

Eaton builds this 400A fusible switch with an aluminum bus, Class T fuse clips, and a 100 kAIC interrupt rating to deliver dependable, code-compliant performance for critical service entrance applications. The UL Listed, NEMA 3R rated construction gives electrical professionals confidence in both indoor and outdoor installations, backed by Eaton's established reputation for main disconnect and service equipment reliability.