Zinsco QB20 20A 1P 120V Circuit Breaker, Bolt-On | AmpState

Introducing the Zinsco QB20 20A 1P 120V Bolt-On Circuit Breaker — a focused, reliable solution for protecting circuits within panelboards, load centers, and electrical distribution systems. Built to deliver steady overcurrent protection, the QB20 is purposefully designed for professional retrofits and maintenance where keeping the part number intact simplifies sourcing and service planning.

Key advantages at a glance

• Amperage & voltage: 20 A, 1 pole, 120 V — ideal for branch circuits in residential and light commercial applications.
• Bolt-On mounting: Secure, robust attachment that supports efficient installation and durable operation in demanding environments.
• Targeted compatibility: Specifically the Zinsco QB20 model, crafted for use in panelboards, load centers, and electrical distribution networks.
• Retrofit-ready: A smart choice for maintenance planning when older installations require consistent part numbers for quick replacements and downtime minimization.
• Availability: Available from AmpState—easy to source when you need reliable protection for your circuits.

This single-pole, 120V breaker is ideal for electricians, facility managers, and contractors who value precise part-number continuity and straightforward installation in existing Zinsco systems. Use it to replace a worn or tripped breaker, expand a circuit with a known, trusted part, or stock a reliable spare for scheduled maintenance without scrambling for alternate models.

Why choose the QB20 for your panel?

• Consolidates retrofit projects by preserving the exact part number, reducing sourcing complexity during maintenance windows.
• Delivers dependable circuit protection with clear, predictable performance for standard 120V distribution.
• Supports efficient inventory and service planning, so you can keep critical circuits protected without delays.

Practical guidance for use

• Verify that your panelboard or load center accepts a bolt-on Zinsco QB20 20A 1P 120V breaker before installation.
• Plan replacements as part of routine maintenance to minimize downtime and ensure continuous protection of lighting, receptacle, and small appliance circuits.
• If you’re unsure about fit, reach out to AmpState for compatibility confirmation and guidance on part-number matching.

With the Zinsco QB20, you’re choosing a purpose-built solution that aligns with your maintenance workflows and panel inventories, delivering dependable protection where it matters most.