Zinsco | QCAL100 | Circuit Breaker | 100A | 2-Pole | Plug-In

Zinsco QCAL100 is a 100 A, 2-Pole circuit breaker designed for plug-in installation in compatible Zinsco electrical panels. Built for maintenance, retrofit, and replacement projects, this breaker helps you restore circuit protection with a precise fit and reliable performance when exact specifications matter.

Key specifications

• Amperage: 100 A
• Poles: 2-Pole
• Connection: Plug-In
• Part reference: QCAL100

Why this matters: the QCAL100 is purpose-built to slot into compatible Zinsco panels, delivering the intended overcurrent protection without compromising panel clearance or trip characteristics. The plug-in design simplifies replacement work, reducing downtime while maintaining panel integrity and safety margins.

Fit, compatibility and ordering tips

Before ordering, confirm the breaker’s fit and ratings for your specific panel. The part number QCAL100 is the most reliable reference for compatibility, ensuring you get the correct amperage, pole configuration, and connection style for your system.

Ideal use scenarios

• Retrofit projects in existing Zinsco panels where a 100 A, 2-pole protection device is required
• Replacement of a performing or failed 100 A two-pole breaker without reconfiguring the panel layout
• Maintenance workflows that demand quick, code-compliant upgrades or repairs with minimal downtime

Installation and safety tips

• Power down the main service and verify absence of voltage before handling the breaker
• Use the correct slot in the panel designed for plug-in breakers of this style
• Seat the breaker firmly until it snaps into place and re-check alignment with adjacent breakers
• After installation, test each connected circuit to confirm proper tripping behavior under fault conditions
• Follow local electrical codes and, if in doubt, consult a licensed electrician for installation guidance

Performance and longevity considerations

The Zinsco QCAL100 is built to deliver consistent overcurrent protection at 100 A with reliable tripping performance. Regular visual inspections for signs of wear, corrosion, or loose connections can help maintain optimal operation and system safety over time.