ZINSCO QB24-1020 U 20A 1P 120V Single-pole Molded Case Circuit Breaker QB241020

Description:

The Zinsco QB24-1020 U is a 20 Amp, single-pole molded case circuit breaker designed for use in Zinsco / GTE Sylvania panelboards. It operates on 120V systems and features a thermal-magnetic trip mechanism that protects circuits from overloads and short circuits. This breaker is part of the QB24 series and uses a bolt-on mounting design, providing a secure connection to the panel bus in legacy installations.

Applications:

The Zinsco QB24-1020 breaker is commonly used in residential and light commercial electrical systems for branch circuits such as kitchen outlets, laundry circuits, garage receptacles, and general-purpose wiring requiring 20A protection. It is intended for installation in Zinsco bolt-on panels and is typically found in older electrical systems where replacement or maintenance is required.

Technical Specifications:

• Manufacturer: Zinsco / GTE Sylvania / Challenger
• Model / Part Number: QB24-1020 U
• Product Type: Molded Case Circuit Breaker (Bolt-On)
• Poles: 1-Pole
• Current Rating: 20 Amps
• Voltage Rating: 120 VAC
• Mounting: Bolt-on (QB series)
• Trip Type: Thermal-magnetic
• Interrupt Rating: ~10 kAIC
• Function: Overcurrent and short circuit protection
• Status: Obsolete / discontinued

Common Replacements:

• Square D QO120 1-Pole 20A Circuit Breaker
• Siemens Q120 1-Pole 20A Circuit Breaker
• Connecticut Electric UBIZ20 1-Pole 20A Zinsco Replacement Breaker