Zinsco GTE Sylvania 600 amp 2 pole circuit breaker QL2424600

Description:

The Zinsco / GTE Sylvania QL2424600 is a 600 Amp, 2-pole molded case circuit breaker used in industrial electrical distribution systems to provide high-capacity overcurrent protection. It is commonly installed as a main breaker in switchgear, panelboards, and large commercial or industrial power systems. Electrical engineers and maintenance personnel use this breaker for replacement or retrofit in legacy Zinsco equipment to maintain system operation.

Applications:

The QL2424600 breaker is widely used in heavy-duty applications such as industrial facilities, commercial buildings, and large electrical service entrances where high current capacity is required. It functions as a main disconnect or feeder breaker, protecting large electrical systems, transformers, and distribution panels from overloads and short circuits. Due to its size and rating, it is typically found in switchgear rather than standard panelboards.

Technical Specifications:

• Manufacturer: Zinsco / GTE Sylvania
• Model / Part Number: QL2424600
• Product Type: Molded Case Circuit Breaker (QL Series)
• Poles: 2-Pole
• Current Rating: 600 Amps
• Voltage Rating: 240 VAC
• Interrupt Rating: ~10 kAIC @ 240V
• Trip Unit: Thermal-magnetic (LI – long-time & instantaneous)
• Mounting: Bolt-on
• Phase: Single-phase
• Weight: ~22 lbs
• Function: Main/feeder overcurrent protection
• Status: Discontinued / obsolete (commonly available surplus or reconditioned)

Common Replacements:

• Siemens JD63B600 600A Molded Case Circuit Breaker
• Square D PowerPact LAL36400 (modern MCCB alternative)
• Eaton Series C J-frame 600A Circuit Breaker