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Murray MQJ3125 - Molded Case Circuit Breaker 125A 3-Pole

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Murray MQJ3125 is a 3-pole molded case circuit breaker designed for thermal magnetic overcurrent protection in commercial and light industrial power distribution systems. It is rated for 240V AC, 125A continuous current, and provides a 10kA interrupting capacity at 240V AC with long time and instantaneous trip functions for coordinated fault clearing. The unit weighs 4 lb, features a bolt-on connection style for secure panel mounting, and operates on a 3-phase electrical system. This breaker complies with UL and NEMA standards for molded case circuit breakers, ensuring reliable performance in branch circuit protection applications. It is typically used in load centers, panelboards, and switchboards requiring a compact, high-amperage protective device.

Key Features & Specifications
  • Type: Molded Case, Thermal Magnetic
  • Voltage Rating: 240V AC
  • Current Rating: 125A
  • Poles: 3
  • Connection: Bolt-On
  • Phase: 3
  • AIC Rating: 10kA@240V
  • Functions: Long Time and Instantaneous Trip
  • Weight: 4 lb
  • Family: MQJ Series
  • Type: MQ


Product Identification
  • UPC: 004089252501
  • GTIN: 00040892525014