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Square D QO3401042 - 3-Pole 40A Thermal Magnetic Breaker (240V)

Square D
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Square D QO3401042 is a three-pole molded case circuit breaker from the QO Series, designed for overcurrent protection in residential and commercial power distribution systems. This 40A breaker operates at 240V with a 10kA interrupting capacity at 240VAC, providing thermal magnetic trip protection with LI (Long-Time and Instantaneous) functions for reliable fault clearance. The unit features a plug-in connection style, measures 3.0 in (76 mm) in height and width by 2.9 in (74 mm) in depth, and weighs 1.21 lb, with a compact construction suitable for QO load centers and panelboards. It is UL Listed and NEC compliant, incorporating a VISI-TRIP indicator for easy identification of tripped status and supporting wire sizes from AWG 8 to 2 copper or aluminum. Typical applications include branch circuit protection in industrial control panels, lighting systems, and motor circuits requiring three-phase, 120/240 VAC service.

Key Features & Specifications
  • Type: Molded Case Circuit Breaker
  • Manufacturer: Schneider Electric
  • Family: QO Series
  • Current Rating: 40A
  • Voltage Rating: 240V
  • Poles: 3
  • Phase: 3
  • Interrupt Rating: 10kA @ 240 VAC
  • Protection: Thermal Magnetic
  • Functions: LI - Long-Time and Instantaneous
  • Connection: Plug-In
  • Dimensions: 3.0 in (76 mm) x 3.0 in (76 mm) x 2.9 in (74 mm) (Height x Width x Depth)
  • Weight: 1.21 lb
  • Certifications: UL Listed, NEC Compliant
  • Wire Size: AWG 8–2 Copper/Aluminum
  • Features: VISI-TRIP indicator, AC/DC Shunt Trip capability


QO3401042