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Westinghouse HKB21750TM - Magnetic Trip Unit 250A 2-Pole 600V

Westinghouse
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Westinghouse HKB21750TM is a MARK 75 series trip unit designed for instantaneous magnetic-only protection in industrial power distribution systems. This 2-pole unit is rated for 600V AC and supports a fixed amperage range of 250A, providing reliable overcurrent protection for compatible KB and HKB frame circuit breakers. The unit weighs 2 lb and features a bolt-on mounting configuration for secure installation within switchgear or panelboards. It is engineered to meet industry standards for magnetic-only protection, ensuring precise response to short-circuit conditions without thermal delay. Typical applications include motor control centers, industrial machinery, and commercial electrical systems requiring instantaneous fault isolation.

Key Features & Specifications
  • Type: HKB
  • Family: MARK 75
  • Functions: I - Instantaneous
  • Protection: Magnetic Only
  • Poles: 2
  • Voltage Rating: 600V AC
  • Amperage: 250A
  • Mounting Type: Bolt-On
  • Weight: 2 lb
  • Compatible Frames: KB, HKB


Part Number: HKB21750TM