Zinsco | QCB20 | Circuit Breaker | 2-Pole | 240V

Meet the Zinsco QCB20 — a 2-pole, 240V circuit breaker engineered for dependable protection in maintenance, retrofit, and replacement projects. Identified by the exact part number QCB20, this breaker is built to align with the specific specs your panel requires.

• Poles: 2-Pole
• Voltage rating: 240V
• Applications: maintenance, retrofit, replacement
• Best compatibility reference: part number QCB20
• Important: confirm fit and ratings before ordering

Why this matters: using the precise QCB20 ensures your panel's protection scheme remains intact, with correct trip characteristics and physical fit. This is essential for reliable service and code-compliant electrical safety in both residential and light commercial environments.

Ideal use cases

• Replacing a failed 2-pole 240V breaker in Zinsco panels that require the QCB20 format
• Retrofits to add or upgrade circuits without compromising safety or compatibility
• Maintenance readiness — keep a stock on hand for service calls and panel upgrades

How to verify compatibility

• Check that your panel specifies a QCB20-compatible 2-pole, 240V breaker
• Ensure the intended circuit requires a 240V, 2-pole protection and that the trip ratings match the circuit load
• Use the part number QCB20 as the primary reference for compatibility when ordering

Practical installation notes

• Always de-energize the main disconnect and follow electrical safety procedures before servicing any panel
• Confirm the panel model and service requirements align with the QCB20 specifications to avoid mismatch
• If in doubt, consult a licensed electrician to validate fit, ratings, and proper installation

Designed for those who demand precise compatibility and dependable protection, the Zinsco QCB20 2-Pole 240V circuit breaker is your solid choice for maintenance, retrofit, and replacement projects. Rely on the exact part number to ensure a correct fit, reliable operation, and sustained electrical safety across your Zinsco panel system.