ZINSCO QB2430 30Amp 2-Pole Zinsco-Type Circuit Breaker

Description:

The Zinsco QB2430 is a 30 Amp, 2-pole molded case circuit breaker designed for use in Zinsco / GTE Sylvania panelboards. It operates on 240V systems and uses a thermal-magnetic trip mechanism to provide protection against overloads and short circuits. This breaker is part of the QB24 series and features a bolt-on mounting design, ensuring a secure electrical connection to the panel bus. Units are typically found in legacy installations and are no longer manufactured.

Applications:

The Zinsco QB2430 breaker is commonly used in residential and light commercial electrical systems for 240V branch circuits such as air conditioning units, water heaters, compressors, and other medium-load equipment requiring 30A protection. It is specifically installed in Zinsco bolt-on panels and is primarily used today for maintenance or replacement of existing systems rather than new installations. 

Technical Specifications:

• Manufacturer: Zinsco / GTE Sylvania / Challenger
• Model / Part Number: QB2430 / QB24-2030
• Product Type: Molded Case Circuit Breaker (Bolt-On)
• Poles: 2-Pole
• Current Rating: 30 Amps
• Voltage Rating: 240 VAC
• Mounting: Bolt-on (QB series)
• Trip Type: Thermal-magnetic
• Interrupt Rating: ~10 kAIC @ 240V
• Function: Overcurrent and short circuit protection
• Status: Obsolete / discontinued

Common Replacements:

• Square D QO230 2-Pole 30A Circuit Breaker
• Siemens Q230 2-Pole 30A Circuit Breaker
• Connecticut Electric UBIZ0230 2-Pole 30A Zinsco Replacement Breaker