QSF4033B - 400Amp Panel Switch

QSF4033B - 400Amp Panel Switch

Electricians and facility managers choose the Zinsco QSF4033B when they need a dependable panel switch that handles serious power. This 400-amp, 3-phase switch operates at 250 volts AC and uses a fusible design that works with Class RK1 and RK5 fuses. You can install it directly using its bolt-in mount—no adapters or special hardware needed. Whether you're replacing outdated gear or building out a new panel, this switch lets you manage high current safely and efficiently.

Key Features and Benefits

• Delivers reliable overcurrent protection: Using standard RK1 or RK5 fuses.
• Installs easily with a bolt-in mount: No extra brackets or customization required.
• Handles up to 400 amps: Making it ideal for larger commercial and industrial systems.
• Withstands frequent use: Built for demanding environments where downtime isn’t an option.

Technical Specifications

• Amperage: 400 Amps
• Voltage: 250 Volts AC
• Phases: 3
• Poles: 3
• Switch Type: Fusible, single unit
• Mounting Style: Bolt-in
• Fuse Compatibility: Class RK1 & RK5
• Dimensions:
  • Length: 13.75 inches
  • Width: 22.5 inches
  • Depth: 6.25 inches

Material Compliance and Certifications

• Manufacturing Standards: Zinsco built this switch using manufacturing standards common at the time.
• Code Compliance: Before installing it in a modern setup, check current electrical codes and regulations. A licensed electrician can confirm whether this unit fits safely into your system.

Where It Works Best

• Use this panel switch in commercial buildings, manufacturing plants, or industrial facilities that need strong power control and safe, fuse-based protection. If you're updating older Zinsco panels or replacing a worn-out switch, the QSF4033B fits well and performs reliably.