ZINSCO Q2430-20 U 20A 240V 3P Molded Case Circuit Breaker Q243020

Description:

The Zinsco Q2430-20 (Q243020) is a 3-pole 20 Amp molded case circuit breaker designed for use in Zinsco / GTE Sylvania load centers and panelboards. It operates on 240 VAC systems and features a thermal-magnetic (Magnatrip) trip mechanism that protects circuits against overloads and short circuits. This breaker is part of the Q24 frame series and uses a plug-in mounting style for direct installation in compatible panels.

Applications:

The Zinsco Q2430-20 breaker is commonly used in commercial and light industrial three-phase systems, including motor control panels, machinery circuits, and distribution boards requiring 20A protection. It functions as a branch or feeder breaker for small motors, control equipment, and balanced three-phase loads. Due to its legacy design, it is now obsolete and typically available only as refurbished or surplus, with modern replacements often recommended.

Technical Specifications:

• Manufacturer: Zinsco / GTE Sylvania / Challenger
• Model / Part Number: Q2430-20 / Q243020
• Product Type: Molded Case Circuit Breaker
• Poles: 3-Pole
• Current Rating: 20 Amps
• Voltage Rating: 240 VAC
• Interrupt Rating: ~10 kAIC @ 240V
• Trip Type: Thermal-magnetic (LI – long-time & instantaneous)
• Mounting: Plug-in (Q24 frame)
• Phase: 3-phase
• Status: Obsolete / discontinued

Common Replacements:

• Square D QOB320 3-Pole 20A Bolt-On Circuit Breaker
• Siemens BQD320 3-Pole 20A Bolt-On Breaker
• Eaton BAB3020H 3-Pole 20A Bolt-On Breaker