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Square D QHB330 - Molded Case Circuit Breaker 300A 3P

Square D
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Square D QHB330 is a molded case circuit breaker designed for providing reliable overcurrent and short-circuit protection in three-phase electrical systems. It features a 300A current rating and a 240V AC voltage rating, housed in a compact, bolt-on unit measuring 3.0 in (76 mm) H x 2.2 in (57 mm) W x 2.9 in (74 mm) D and weighing 0.84 lb. The breaker is UL and CSA certified, meeting industry standards for safety and performance with a 65kA interrupting capacity at 240V. Its thermal-magnetic protection with long-time and instantaneous (LI) tripping functions makes it suitable for industrial power distribution, panelboards, and motor control applications.

Key Features & Specifications
  • Type: QHB Series, Molded Case, Thermal-Magnetic Protection, Bolt-On Connection
  • Voltage Rating: 240V AC
  • Current Rating: 300A
  • Dimensions: 3.0 in (76 mm) H x 2.2 in (57 mm) W x 2.9 in (74 mm) D
  • Standards: UL, CSA
  • Applications: Industrial Power Distribution, Panelboards, Motor Control Centers
  • Switch Type: Circuit Breaker
  • Configuration: Fixed
  • Phase: 3
  • Poles: 3
  • Connection: Bolt-On
  • Protection: Thermal Magnetic
  • Functions: LI - Long-Time and Instantaneous Tripping
  • AIC rating: 65kA @ 240V
  • Wire Size: AWG 14 to AWG 8 Copper/Aluminum
  • Certification: UL, CSA
  • Family: QOB Series
  • Country of Origin: Mexico
  • Weight: 0.84 lb


Product Identification
  • UPC: 785901341673
  • GTIN: 00785901341673