Zinsco HQB HQB243100 3 Pole 100 Amp 240V Circuit Breaker

Description:

The Zinsco HQB243100 is a 3-pole 100 Amp bolt-on molded case circuit breaker used in industrial and commercial electrical distribution systems. It provides overcurrent protection for 240V three-phase circuits and is typically installed in Zinsco panelboards and switchgear. Electricians and maintenance personnel use this breaker for servicing or replacing components in legacy Zinsco systems.

Applications:

The Zinsco HQB243100 breaker is widely used in industrial panels, motor control centers, and feeder circuits where moderate-to-high current protection is required. It is suitable for protecting equipment such as motors, distribution feeders, and machinery. The HQB series is now obsolete and discontinued, commonly sourced as surplus or refurbished units.

Technical Specifications:

• Manufacturer: Zinsco / GTE Sylvania
• Model / Part Number: HQB243100
• Product Type: Molded Case Circuit Breaker (Bolt-On)
• Poles: 3-Pole
• Current Rating: 100 Amps
• Voltage Rating: 240 VAC
• Phase: 3-phase
• Interrupt Rating: ~10 kAIC @ 240V
• Trip Type: Thermal-magnetic (LI)
• Mounting: Bolt-on
• Function: Overcurrent and short circuit protection
• Status: Discontinued / obsolete

Common Replacements:

• Square D QOB3100VH 3-Pole 100A Bolt-On Circuit Breaker
• Siemens BQD3100 3-Pole 100A Bolt-On Breaker
• Eaton BAB3100H 3-Pole 100A Bolt-On Breaker