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A1B140

Square D
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Square D A1B140 is a 1-pole, 40-amp, 120-volt bolt-on molded case circuit breaker designed for overcurrent protection in electrical distribution systems. It utilizes a thermal magnetic trip unit with LI (Long-Time and Instantaneous) functions to safeguard against sustained overloads and short circuits. The breaker features a bolt-on connection for secure mounting and weighs 1 lb, with a compact construction suitable for panelboard installation. It carries a 10kA interrupting rating at 120V and is UL listed, meeting industry safety certifications. This breaker is typically applied in residential and commercial branch circuit protection.

Key Features & Specifications
  • Manufacturer: Square D
  • Part Number: A1B140
  • Type: A1B
  • Family: A1B Series
  • Item Subcategory: Molded Case
  • Amperage: 40A
  • Voltage: 120V AC
  • Poles: 1
  • Phase: 1
  • Mounting Type: Bolt-On
  • Connection: Bolt-On
  • Interrupt Rating: 10kA @ 120V
  • Series/Frame: A1B
  • Trip Unit: Thermal Magnetic
  • Functions: LI - Long-Time and Instantaneous
  • Protection: Thermal Magnetic
  • Weight: 1 lb
  • Certifications: UL Listed


Square D A1B140 - Molded Case Circuit Breaker 40A 1-Pole