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Square D QOB140 - Thermal Magnetic Circuit Breaker 40A 1-Pole

Square D
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Square D QOB140 is a molded case circuit breaker designed for providing reliable overcurrent protection in residential and light commercial electrical panels. It features a 40A current rating and a 120/240VAC voltage rating, housed within a compact, bolt-on unit measuring 79 mm H x 19 mm W x 74 mm D and weighing 0.313 lb. This single-pole breaker utilizes a thermal-magnetic trip mechanism for both long-time and instantaneous protection, is constructed with pressure plate terminals for secure connections, and complies with UL and CSA standards for safety. It is engineered for a wide operating temperature range of -25°C to 70°C and is suitable for protecting branch circuits with copper or aluminum conductors sized from AWG 8 to AWG 2.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker, Thermal-Magnetic Protection, Bolt-On Connection
  • Voltage Rating: 120/240VAC
  • Current Rating: 40A
  • Dimensions: 3.1 in (79 mm) H x 0.7 in (19 mm) W x 2.9 in (74 mm) D
  • Standards: UL Listed, CSA
  • Applications: Residential & Light Commercial Branch Circuit Protection
  • Switch Type: Circuit Breaker
  • Configuration: Single-Pole
  • Temp Rating: -25°C to 70°C
  • Phase: 1
  • AIC Rating: 10kA @ 120V
  • Connection: Bolt-On
  • Poles: 1
  • Protection: Thermal Magnetic
  • Functions: Long-Time and Instantaneous Trip (LI)
  • Terminal Connection: Pressure Plate
  • Wire Size: AWG 8 to AWG 2, Copper/Aluminum
  • Certification: UL Listed
  • Family: QOB Series
  • Country of Origin: Mexico


Product Identification
  • UPC: 785901416784
  • GTIN: 00785901416784