QMB320EX - 200 Amp Mounting Hardware Kit

QMB320EX  - 200 Amp Mounting Hardware Kit

Looking for a reliable way to expand your Square D QMB panelboard setup? The QMB320EX 200 Amp Extension Assembly is precisely what you need. Designed with performance, safety, and durability in mind, this compact 9-inch unit gives your electrical system more room to grow, without compromising on space or compliance. If you are upgrading an existing setup, this extension accessory helps you do the job right, with less hassle and complete confidence. Made in the USA and UL-listed, it's built to handle serious power and last the long haul.

Key Features and Benefits

• Perfect Fit for QMB Panelboards: Designed to work specifically with Square D QMB Type QW boards (38-inch Wide, Pre-1984), so you know it'll fit and function seamlessly—no guesswork.
• IMPORTANT NOTE: These factory kits do NOT include the Rail Extensions.
• Handles Heavy Loads: Rated at 200 amps, this unit is made to safely manage demanding electrical applications, whether it's AC or DC.
• Space-Conscious Design: Its low-profile, 9-inch build means it fits neatly into tighter panelboard spaces—ideal for crowded electrical rooms.
• Sustainably Packaged: Ships in recyclable packaging to help reduce environmental waste on the job site.
• Engineered to Last: Durable, well-built, and backed by a solid 18-month warranty, giving you one less thing to worry about.

Technical Specifications

• Product Type: Extension Assembly
• Series: QMB Panelboard Accessories
• Amperage Rating: 200 Amps
• Dimensions:
  • Height: 9.02 in
  • Width: 5.5 in
  • Depth: 4.02 in
• Weight: 4.85 lbs (2.20 kg)
• Compatibility: For use in Square D QMB Panelboards
• Made In: United States

Certifications & Environmental Info

• UL Listed and cULus Recognized: This accessory meets major safety standards for North America, giving you peace of mind on every install.
• Eco-Friendly Shipping: Packaged in recyclable cardboard—because performance shouldn't come at the planet's expense.
• Warranty: Comes with an 18-month manufacturer's warranty, showing it's built to go the distance.

Where It Works Best

• The QMB320EX is an excellent fit for pros in commercial, industrial, and utility environments—think electricians, engineers, facility managers, and contractors. Whether you're outfitting a manufacturing plant, maintaining a large commercial building, or retrofitting aging infrastructure, this extension kit makes your panelboard setup more adaptable, safe, and future-ready.