Zinsco | QB243030 | Circuit Breaker | 30A | 3-Pole | 240V | 10kA | Bolt-On

Meet the Zinsco QB243030 Circuit Breaker — a 30A, 3-Pole, 240V bolt-on unit designed for maintenance, retrofit, and replacement projects where exact specifications matter. With a 10 kA interrupt rating, this breaker delivers reliable overcurrent protection for demanding 240V circuits while preserving the integrity of compatible Zinsco panels.

Designed for bolt-on mounting, the QB243030 provides a secure, vibration-resistant connection that stays tight through normal service conditions. The 3-pole configuration supports three-phase circuits, making it a robust choice for equipment and systems that rely on solid, balanced protection across all conductors.

Key specifications

• Amperage: 30 A
• Poles: 3-Pole
• Voltage: 240 V
• Interrupt Rating: 10 kA
• Mounting: Bolt-On

Why this Zinsco breaker is a smart choice

For professionals maintaining or upgrading older electrical systems, the QB243030 provides an exact spec match essential for compatibility. The part number QB243030 is the most reliable reference when confirming fit, ensuring you don’t risk mismatches in panel buses or mounting hardware. The bolt-on design fosters a solid connection that remains secure under typical vibration and thermal cycling, a practical advantage in compact service rooms or industrial environments.

Ideal use scenarios

• Retrofits: replacing an aging 3-pole 30A breaker in compatible Zinsco panels during service upgrades.
• Maintenance: quick replacement of a failed 30A, 3-pole unit without modifying the panel layout.
• Circuit upgrades: adding or reconfiguring 30A 240V circuits for equipment like HVAC, pumps, or other 3-phase loads in compliant installations.

Compatibility and installation tips

Before ordering, verify that your panel accepts bolt-on breakers and that the QB243030 matches the exact bus design. Always power down the system and follow the panel manufacturer’s installation guidelines. Use the proper conductor sizing and fastening practices as required by applicable electrical codes. If you’re unsure about fit or ratings, consult a licensed electrician—the part number QB243030 is the best reference for compatibility.

In short, the Zinsco QB243030 is a precise, purpose-built solution for upgrading or maintaining 240V, 30A three-pole circuits in compatible panels. When you need a dependable bolt-on breaker that aligns with exact specifications, this unit offers a direct, code-conscious path to secure protection and reliable operation.