Zinsco | QB30 | Circuit Breaker | 30A | 1-Pole | 120V | Bolt-On

Designed for Zinsco panels, the Zinsco QB30 is a 30-amp, 1-pole, 120-volt bolt-on circuit breaker built to deliver dependable overcurrent protection in retrofit and replacement projects. Identified by the part number QB30, this breaker ensures exact compatibility in maintenance tasks where matching specs matters.

Key specifications

• Amperage: 30A
• Poles: 1-Pole
• Voltage: 120V
• Mounting: Bolt-On
• Identification: Part number QB30 is the primary compatibility reference

Why it matters for your electrical upgrades

When you're upgrading or replacing breakers in a Zinsco panel, exact spec matching is critical for safe operation and panel performance. The QB30 bolt-on design provides a secure mechanical connection that aligns with Zinsco panels designed for bolt-on style breakers, helping maintain proper trip response and electrical clearance.

Use cases

• Maintenance replacements in existing Zinsco panels that require 30A protection on a 1-pole, 120V circuit
• Retrofits within service panels that mandate bolt-on mounting and QB30 compatibility
• Repairs in facilities where matching the original part number ensures proper fit and compatibility considerations

Compatibility and ordering notes

Before ordering, confirm the breaker’s fit and ratings against your panel labeling. Rely on the QB30 part number as the best reference for compatibility with Zinsco systems. If the panel requires a bolt-on breaker of this specification, the QB30 is designed to install in accordance with standard Zinsco bolt-on configurations.

Important: Installation should be performed by a licensed electrician following local electrical codes.