ZINSCO Q2430-40D U 40A 240V 3P Molded Case Circuit Breaker Q243040D

Description:

The Zinsco Q2430-40D is a 3-pole 40 Amp molded case circuit breaker designed for use in Zinsco / GTE Sylvania panelboards. It operates on 240 VAC systems and features a thermal-magnetic (Magnatrip) trip mechanism that provides protection against overloads and short circuits. This model is part of the Q24 frame (Type Q series) and is typically a plug-in breaker with load-side lugs and standard interrupting capacity. The “D” designation indicates suitability for delta (3-phase) configurations.

Applications:

The Zinsco Q2430-40D breaker is commonly used in industrial and commercial three-phase electrical systems, particularly in delta-configured power systems. It is suitable for protecting motors, compressors, pumps, and distribution feeders requiring 40A protection. This breaker is typically installed in older Zinsco panels and is now obsolete, usually available only as surplus or refurbished units.

Technical Specifications:

• Manufacturer: Zinsco / GTE Sylvania / Challenger
• Model / Part Number: Q2430-40D
• Product Type: Molded Case Circuit Breaker
• Poles: 3-Pole
• Current Rating: 40 Amps
• Voltage Rating: 240 VAC
• Phase: 3-phase (delta capable)
• Interrupt Rating: ~10 kAIC @ 240V
• Trip Type: Thermal-magnetic (LI – long-time & instantaneous)
• Mounting: Plug-in (Q24 frame)
• Terminals: Load-side lug terminals
• Status: Obsolete / discontinued (surplus market availability)

Common Replacements:

• Square D QOB340 3-Pole 40A Bolt-On Circuit Breaker
• Siemens BQD340 3-Pole 40A Bolt-On Breaker
• Eaton BAB3040H 3-Pole 40A Bolt-On Breaker