ZINSCO Q40N N 40A 120V 1P Single-pole Circuit Breaker

Description:

The Zinsco Q40N N is a 40 Amp, single-pole circuit breaker designed for use in Zinsco and GTE Sylvania load centers. It operates on 120V systems (120/240 VAC class) and uses a thermal-magnetic (Magnatrip) trip mechanism to protect circuits from overloads and short circuits. This breaker features a plug-in mounting design and is part of the legacy Type Q series.

Applications:

The Zinsco Q40N breaker is commonly used in residential and light commercial branch circuits requiring 40A protection, such as electric heaters, well pumps, compressors, and dedicated appliance circuits. It is specifically designed for Zinsco-compatible panels, which are now obsolete but still found in older electrical systems.

Technical Specifications:

• Manufacturer: Zinsco / GTE Sylvania / Challenger
• Model / Part Number: Q40N / Q40
• Product Type: Circuit Breaker
• Poles: 1-Pole
• Current Rating: 40 Amps
• Voltage Rating: 120/240 VAC
• Interrupt Rating: ~10 kAIC
• Mounting: Plug-in
• Trip Type: Thermal-magnetic (Magnatrip)
• Function: Overcurrent and short circuit protection
• Status: Obsolete / discontinued (aftermarket replacements available)

Common Replacements:

• Connecticut Electric UBIZ40 1-Pole 40A Zinsco Replacement Breaker
• Siemens Q140 1-Pole 40A Circuit Breaker
• Square D QO140 / HOM140 1-Pole 40A Circuit Breaker