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Thomas & Betts 18RA2577 - Class RK1 Fuse 600V 400A

Thomas & Betts
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Thomas & Betts 18RA2577 is a heavy-duty industrial fuse designed for overcurrent protection in high-power electrical systems. It is rated for a maximum voltage of 600V AC and a current of up to 400A, ensuring robust performance in demanding environments. The fuse weighs 45 lb and features a durable construction with a Class RK1 rating, providing high interrupting capacity for fault current protection. It complies with UL and CSA standards, making it suitable for use in industrial motor control centers, switchboards, and panelboards. Typical applications include protecting feeders, branch circuits, and equipment in manufacturing plants, commercial buildings, and utility installations.

Key Features & Specifications
  • Type: Class RK1 fuse, current-limiting, time-delay
  • Voltage Rating: 600V AC
  • Current Rating: 400A
  • Weight: 45 lb
  • Standards: UL Listed, CSA Certified
  • Applications: Overcurrent protection for motors, transformers, and general industrial circuits
  • Fuse Class: RK1
  • Interrupting Rating: High AIC rating for fault current
  • Mounting: Clip or bolted connection
  • Terminal Connection: Ferrule or blade type


Product Identification
  • UPC: 78621083933
  • GTIN: 00786210839332