QSF4053B w/ Mounting Kit - 400Amp Panel Switch

QSF4053B w/ Mounting Kit - 400Amp Panel Switch

The Zinsco QSF4053B is a high-capacity, fusible panel switch built to handle demanding electrical loads in commercial and industrial environments. Rated at 400 amps and 600 volts AC, this three-phase, three-pole switch offers a dependable solution for overcurrent protection in panelboard systems. It comes equipped with a matching mounting kit, so you’ve got everything needed for a solid, secure installation right out of the box. The bolt-in design simplifies setup and ensures a tight, reliable connection to your existing infrastructure. With compatibility for Class RK1 and RK5 fuses, the QSF4053B helps deliver safer, easier-to-maintain electrical distribution—exactly what professionals expect when dealing with critical power systems.

Key Features and Benefits

• Fuse-Compatible Design: Supports both Class RK1 and RK5 fuses, making it easier to match existing systems and streamline maintenance.
• Mounting Kit Included: Comes with the hardware you need to get set up fast and without extra parts to chase down.
• Bolt-In Configuration: Built for a snug, no-hassle fit in standard panelboard applications.
• Heavy-Use Ready: Designed for continuous use in tough electrical environments where performance matters.

Technical Specifications

• Amperage: 400 Amps
  
• Voltage: 600 Volts AC
  
• Poles: 3
  
• Phase: 3
  
• Dimensions:
  • Length: 13.75 inches
  • Width: 22.5 inches
  • Depth: 6.25 inches
• Style: Fusible, Single Unit (Type QSF)
  
• Fuse Compatibility: RK1 and RK5
  
• Mounting Kit: Included
  

Material Compliance and Certifications

• This switch is manufactured in line with recognized safety and performance standards, and it goes through careful inspection before reaching the field. It’s built to meet electrical codes and endure in environments where reliable power control is non-negotiable.

Where It Works Best

• Perfect for commercial and industrial settings—think factories, office buildings, data centers, and more. Whether you're upgrading an older system or working on a new installation, the QSF4053B gives you a dependable, straightforward solution for managing high-power electrical loads with confidence.