Zinsco | QB243020 | Circuit Breaker | 20A | 3-Pole | 240V | 10kA

Zinsco QB243020 is a purpose-built circuit breaker engineered for reliability in maintenance, retrofit, and replacement projects. This 20A, 3-Pole unit operates at 240V and carries a robust 10kA interrupting rating, delivering dependable protection for your electrical system in compatible Zinsco panels. The part number QB243020 is the best reference for ensuring an exact fit and proper performance.

Key specifications

• Amperage: 20A
• Poles: 3-Pole
• Voltage: 240V
• Interrupting rating: 10kA

Why this breaker matters

Rather than a generic substitute, the Zinsco QB243020 is designed to align with Zinsco panel architectures, ensuring precise contact, predictable tripping behavior, and long-term reliability. The 3-pole configuration accommodates multi-channel protection and is well-suited for applications that require coordinated protection across multiple conductors in compatible panels.

Ideal use cases

• Maintenance: swap aging or degraded breakers to restore consistent circuit protection.
• Retrofit: upgrade legacy setups that demand a 20A, 3-Pole, 240V solution with a 10kA interrupting capability.
• Replacement: keep a ready referential part on hand for quick, accurate repairs when your panel specifies QB243020.

Compatibility and installation guidance

Important notes: confirm fit and ratings before ordering. The QB243020 part number is the most reliable reference for compatibility with your Zinsco panel. For safety and performance, have a qualified electrician perform the installation and adhere to local electrical codes.

Practical tips for best results

• Verify that your panel supports a 3-Pole, 240V breaker with a 10kA interrupting rating before purchase.
• Inspect adjacent lugs and conductors for wear or corrosion prior to replacement to ensure a solid connection.
• Maintain a small inventory of this specific part to minimize downtime during routine maintenance or panel upgrades.