Thomas & Betts | QB50 | Circuit Breaker | 50A | 120V | Bolt-On

Introducing the Thomas & Betts QB50 Circuit Breaker—a bolt-on protection solution engineered for reliability in maintenance, retrofit, and replacement projects where exact specifications matter. With a 50A rating at 120V, it delivers dependable overcurrent protection while integrating smoothly into compatible panels.

The bolt-on design provides a secure, vibration-resistant mount, simplifying installation and service calls. This means fewer loosening concerns in demanding environments and quicker field adjustments when your electrical system evolves.

Why the QB50 stands out

• Exact protection specs: 50A, 120V to safeguard high-load circuits and equipment
• Bolt-on mounting: secure, straightforward installation and reliable performance in busy panels
• Clear compatibility reference: use the QB50 part number as your best guide for matching replacements
• Maintenance, retrofit, and replacement ready: designed for scenarios where you’re upgrading or refreshing panel protection
• Trusted brand lineage: backed by Thomas & Betts’ decades of electrical hardware expertise

How to use and install

Before you order, confirm the fit and ratings for your specific panel. Use the QB50 reference to ensure compatibility with your bus configuration and interrupting requirements. This breaker is intended for bolt-on installations in compatible enclosures, delivering dependable protection without the guesswork of mismatched components.

Ideal use cases

• Retrofit projects where existing protection needs an exact, spec-matched replacement
• Maintenance schedules in commercial or industrial electrical rooms requiring reliable 50A protection
• Panel upgrades that demand a bolt-on 50A, 120V solution for high-demand circuits
• Stock material for service technicians who rely on the QB50 for rapid field replacements

Choosing the QB50 means aligning with precise electrical specs and mounting requirements. It’s a deliberate, field-tested component designed to minimize downtime and safeguard critical circuits without compromising on ease of installation or performance.