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Westinghouse HKB3250TM - Trip Unit 250A 600V 3-Pole

Cutler Hammer
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Westinghouse HKB3250TM is a MARK 75 series trip unit designed for use with molded case circuit breakers to provide instantaneous magnetic-only overcurrent protection. It is rated for 250A at 600V AC across three poles, with a minimum amperage of 250 and a maximum of 250. This unit weighs 2 lb and is compatible with KB and HKB frames, featuring a panel mount installation and an interchangeable trip mechanism. It meets industry standards for industrial and commercial power distribution systems, offering a 25kA interrupting rating at 480V. Typical applications include protecting branch circuits and equipment in manufacturing plants, commercial buildings, and heavy industrial environments.

Key Features & Specifications
  • Manufacturer: Westinghouse
  • Item Subcategory: Trip Units & Programmers
  • Family: MARK 75
  • Type: HKB
  • Weight: 2 lb
  • Functions: I - Instantaneous
  • Voltage Rating: 600V
  • Poles: 3
  • Amperage Minimum: 250
  • Protection: Magnetic Only
  • Compatible Frames: KB, HKB
  • Amperage Maximum: 250
  • Part Number: HKB3250TM
  • Series/Frame: MARK 75 HKB
  • Amperage: 250A
  • Voltage: 600V
  • Mounting Type: Panel Mount
  • Interrupt Rating: 25kA @ 480V
  • Trip Unit Type: Thermal Magnetic
  • Interchangeable Trip: Yes
  • Application: Molded Case Circuit Breaker
  • Compatible Frame: HKB