Zinsco | QB243070 | Circuit Breaker | 3-Pole | Bolt-On

Discover reliability with the Zinsco QB243070, a 3-pole bolt-on circuit breaker designed for maintenance, retrofit, and replacement projects where exact specifications matter. This model keeps your electrical system protected with a solid, secure connection that today’s panels demand.

• 3-Pole bolt-on configuration: delivers robust, multi-line protection with a secure mounting method that stays put under load.
• Part number QB243070: use this identifier as the best reference for ensuring compatibility with your panel and project requirements.
• Versatile application: ideal for maintenance, retrofit, and replacement tasks that require matching specs and reliable performance.
• Fit and ratings matters: confirm the breaker’s fit and electrical ratings before ordering to guarantee proper protection and compliance.

Why this Zinsco circuit breaker stands out

• Precisely engineered for Zinsco systems, providing consistent protection in panels that rely on three-pole protection and bolt-on mounting.
• Bolt-on installation simplifies field replacement and retrofit projects, helping electricians complete panels without altering existing wiring topologies.
• The QB243070 designation helps you verify compatibility quickly, reducing uncertainty and returns when sourcing replacement breakers.

Ideal use scenarios

• Maintenance: swap aging or worn breakers for a dependable, 3-pole bolt-on option to preserve circuit protection.
• Retrofit: upgrade legacy panels that require a precise 3-pole bolt-on breaker to maintain system integrity and listing.
• Replacement: choose this model when your project documentation or panel listing specifies QB243070 for exact compatibility.

Before you place an order, compare your panel listing with the QB243070 specification and verify the breaker's ratings align with your circuit’s protection needs. The part number is your most reliable reference for compatibility, helping you source the correct 3-pole bolt-on breaker the first time.