Zinsco HQB24 QB HQB243015 3 pole 15 Amp 240 Vac Circuit Breaker Bolt On

Description:

The Zinsco HQB24 / QB / HQB243015 is a 3-pole 15 Amp bolt-on circuit breaker used in industrial and commercial electrical distribution systems to provide overcurrent protection for 240V circuits. It is typically installed in Zinsco bolt-on panelboards and switchgear, protecting three-phase loads and equipment. Electricians and maintenance personnel use this breaker for repair or replacement in legacy Zinsco systems.

Applications:

The Zinsco HQB24 breaker is widely used in industrial panels, motor control systems, and three-phase distribution setups where low-amperage protection is required. It functions as a feeder or branch breaker for equipment such as small motors, control circuits, and machinery. As part of the Zinsco bolt-on series, it is commonly found in older installations and is now considered obsolete, often replaced with modern MCCBs.

Technical Specifications:

• Manufacturer: Zinsco / GTE Sylvania
• Model / Part Number: HQB24 / HQB243015 / QB
• Product Type: Molded Case Circuit Breaker (Bolt-On)
• Poles: 3-Pole
• Current Rating: 15 Amps
• Voltage Rating: 240 VAC
• Mounting: Bolt-on
• Trip Type: Thermal-magnetic
• Function: Overcurrent and short circuit protection
• Application: Three-phase distribution systems
• Status: Obsolete / discontinued

Common Replacements:

• Square D QOB315HID Bolt‑On 3‑Pole 15A Breaker
• GE THQL32015 3‑Pole 15A Circuit Breaker
• Eaton QBHW3015H 3‑Pole 15A Breaker