Zinsco QCB QCB230 2 Pole 30 Amp 240V Molded Case Circuit Breaker

Description:

The Zinsco QCB230 is a 30 Amp, 2-pole molded case circuit breaker designed for use in Zinsco / GTE Sylvania panelboards. It operates on 240V systems and features a thermal-magnetic trip mechanism that protects circuits from overloads and short circuits. It belongs to the QCB series and is typically configured as a bolt-on type breaker, ensuring a secure connection to the panel bus. Standard specifications confirm a 30A rating, 2 poles, and 240V operation within the QCB product line.

Applications:

The Zinsco QCB230 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 intended for legacy Zinsco panels and is primarily used today for maintenance or replacement of existing installations.

Technical Specifications:

• Manufacturer: Zinsco / GTE Sylvania
• Model / Part Number: QCB230
• Product Type: Molded Case Circuit Breaker
• Poles: 2-Pole
• Current Rating: 30 Amps
• Voltage Rating: 240 VAC
• Mounting: Bolt-on (QCB series typical)
• Trip Type: Thermal-magnetic
• Interrupt Rating: ~10 kAIC @ 240V (typical class)
• Phase: Single-phase
• Function: Overcurrent and short circuit protection
• Status: Obsolete / discontinued

Common Replacements:

• Connecticut Electric UBIZ230B 2-Pole 30A Zinsco Replacement Breaker
• Siemens Q230 2-Pole 30A Circuit Breaker
• Square D QOB230 2-Pole 30A Bolt-On Circuit Breaker