ZINSCO Q140 Single Pole 40 AMP Type T Type Q MAGNETRIP Circuit Breaker 120 240 V

Description:

The Zinsco Q140 is a 40 Amp, single-pole circuit breaker designed for use in Zinsco and GTE Sylvania load centers. It operates on 120/240 VAC systems and is part of the Type Q / Type T Magnatrip series, utilizing a thermal-magnetic trip mechanism to protect against overloads and short circuits. This breaker features a plug-in design and is commonly found in older residential electrical panels.

Applications:

The Zinsco Q140 breaker is widely used in residential and light commercial branch circuits that require 40A protection, such as air conditioning units, electric heaters, compressors, and dedicated appliance circuits. It is specifically intended for Zinsco-compatible panels, which are now obsolete but still in service in many legacy installations.

Technical Specifications:

• Manufacturer: Zinsco / GTE Sylvania / Challenger
• Model / Part Number: Q140 / Q40
• Product Type: Circuit Breaker
• Poles: 1-Pole
• Current Rating: 40 Amps
• Voltage Rating: 120/240 VAC
• Mounting: Plug-in
• Interrupt Rating: ~10 kAIC (typical class)
• Trip Type: Thermal-magnetic (Magnatrip)
• Function: Overcurrent and short circuit protection
• Status: Discontinued / obsolete

Common Replacements:

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