Square D PBQ4640G I-Line II Busway Plug-In Unit – 400A – 4 Pole – Class J Fusible – 120/208/347/600V – Busway Plug-In Switch

The Square D PBQ4640G is an I-Line II busway fusible plug-in unit designed for modular power distribution in commercial and industrial electrical systems. It provides branch circuit protection using Class J fuses and is designed for use on 3-phase, 4-wire busway systems. This unit enables safe, flexible, and scalable power distribution with high interrupting capacity.

Electrical Ratings

• Current Rating: 400 A
• Voltage Rating: 120 / 208 / 347 / 600 V AC
• Phase: 3 Phase
• Circuit Configuration: 3-Phase, 4-Wire
• Poles: 4 Pole
• Fuse Type: Class J
• Interrupting Rating: 100 kA
• Neutral Type: None
• Ground Type: Integral
• Application: Busway power distribution system

Protection and Function

• Device Type: Fusible plug-in busway unit
• Protection Method: Class J fuse-based overcurrent protection
• Function: Branch circuit protection and distribution
• Configuration: 3-fuse + ground system
• Safety Function: Overload and short-circuit protection via fuses
• High fault withstand capability

Configuration and Function

• Model Series: PBQ
• Connection Type: Plug-in (I-Line II Busway compatible)
• Used On: I-Line II busway systems
• Sub-category: Busway fusible plug-in switch
• Application: Industrial and commercial power distribution

Mechanical and Physical Characteristics

• Modular plug-in busway construction
• Designed for fast installation and replacement
• Heavy-duty industrial-grade enclosure
• Integral grounding system for safety
• Built for high fault-current environments
• Suitable for scalable busway systems

Standards and Certifications

• UL 857 compliant
• CSA C22.2 certified
• Manufacturer: Square D / Schneider Electric
• Series: I-Line II Busway PBQ
• UNSPSC: 39131701

Features

• 400A busway plug-in fusible unit
• Class J fuse protection for high interrupting performance
• 100 kA interrupting rating
• Designed for 3-phase, 4-wire distribution systems
• Plug-in design for flexible system expansion
• High reliability in industrial environments
• Integral grounding for safety compliance
• Supports scalable power distribution networks
• Rugged construction for demanding applications

Returns are easy

You may return items within 30 days of delivery for a refund.

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