Zinsco HQB243015 3 Pole 15 Amp 240V Circuit Breaker "AK"

Description:

The Zinsco HQB243015 (marked “AK”) is a 3-pole 15 Amp bolt-on circuit breaker used in legacy Zinsco electrical distribution systems to provide overcurrent protection for 240V three-phase circuits. It is commonly installed in panelboards and switchgear, protecting control circuits, small motors, and industrial equipment. Electricians and maintenance personnel use this breaker for replacement or servicing of older Zinsco installations.

Applications:

The Zinsco HQB243015 breaker is widely used in industrial and commercial electrical systems where three-phase, low-amperage protection is required. Typical uses include motor control panels, machinery circuits, and feeder protection. As part of the Zinsco bolt-on series, it is found in older equipment and is now obsolete, often replaced with modern MCCBs.

Technical Specifications:

• Manufacturer: Zinsco / GTE Sylvania
• Model / Part Number: HQB243015 (AK variant)
• 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 industrial distribution
• Status: Obsolete / discontinued

Common Replacements:

• Square D QOB315 Bolt-On 3-Pole 15A Circuit Breaker
• Siemens BQD315 3-Pole 15A Bolt-On Breaker
• Eaton BAB3015H 3-Pole 15A Bolt-On Breaker