Square D NQ Panelboard Interior, Main Lugs, Copper Bus

Square D NQ Panelboard Interior, Main Lugs, Copper Bus

The Square D NQ Panelboard Interior is a ready-to-install interior assembly designed for commercial buildings, industrial buildings, data centers, stadiums, and offices. Configured with main lugs and a copper (Cu) bus, this NQ interior supports up to 54 pole spaces and is rated 3 phase, 4 wire at 240V AC / 48V DC operational voltage. This interior platform is available across amperage ratings from 400A to 600A to match a range of feeder and motor-circuit load requirements, so the appropriate rating can be selected for the specific installation. Field convertible to top or bottom feed, it is built to UL and CSA standards for dependable, code-compliant power distribution.

Key Features

• Amperage Range: Available in ratings from 400A to 600A to support varied feeder and load requirements.
• Pole Spaces: Configured for up to 54 pole spaces to support high circuit-density panelboard layouts.
• Copper Bus: Cu bus construction delivers reliable current-carrying capacity and conductivity.
• Main Lugs Connection: Main lugs load center type provided as a ready-to-install interior assembly; also available as main lug or main breaker.
• Electrical Rating: 3 phase, 4 wire configuration rated 240V AC / 48V DC operational voltage (Ue).
• Interrupt Rating Options: Available with 10 kA, 22 kA, or 65 kA interrupting current (Iu) ratings.
• Breaker Compatibility: Accepts QO(VH) plug-in and QOB(VH) bolt-on circuit breakers, including QOB, QHB, and QOB-VH types.
• Field Convertible: Field convertible to top or bottom feed for flexible installation.
• Terminal Connections: Line and neutral aluminum lugs accept AWG 1/0...750 kcmil conductors, tightened to 31.07-33.90 N.m.

Certifications & Compliance

• UL Listed
• CSA Certified
• RoHS Compliant (ROHS Eur In Scope)
• Mercury Free
• Toxic Heavy Metal Free

Technical Specifications

• Standards: UL-CSA
• Country of Origin: Mexico
• Toxic Heavy Metal Free: Yes
• Warranty: 18 months
• Mercury Free: Yes
• ROHS Eur In Scope: Yes
• Recycled Metal Content At Cr Level: 0 %
• China ROHS Label: 1
• With Recycled Cardboard: Yes
• WEEE Product Category: 5
• China ROHS In Scope: No
• Returnability: Yes
• China ROHS Regulation: Pro-active China RoHS declaration (out of China RoHS legal scope)
• Available as main lug or main breaker

Typical Applications

• Commercial Buildings
• Industrial Buildings
• Data Centers
• Stadiums
• Offices
• Panelboard and Load Center Wiring

Why Square D?

Square D NQ panelboard interiors combine a copper bus, main lugs configuration, and UL/CSA-recognized construction to deliver dependable power distribution across a 400A to 600A rating range for demanding commercial and industrial environments. With Mercury Free and Toxic Heavy Metal Free construction plus an 18-month warranty, this interior is engineered for reliable, code-compliant performance backed by Square D's trusted electrical distribution platform.