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Mersen J266 - Class J Fuse 200A 600VAC

Ferraz Shawmut
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The Mersen (formerly Ferraz Shawmut) J266 is a 600VAC/500VDC, 200A Class J time-delay fuse designed for superior overcurrent protection in industrial power distribution systems. This fuse features a compact, rejection-style body with a 5.19 lb weight and is constructed with a high-performance melamine tube and silver-plated contacts for reliable operation under high fault conditions. It complies with UL 248-8 and CSA C22.2 standards, ensuring branch circuit protection with a 200kA interrupting rating at 600VAC. Typical applications include motor circuits, feeder protection, and panelboard mains in manufacturing, processing, and heavy industrial environments.

Key Features & Specifications
  • Type: Class J, time-delay, current-limiting fuse with rejection-style mounting
  • Voltage Rating: 600VAC / 500VDC
  • Current Rating: 200A
  • Dimensions: Standard Class J physical size
  • Standards: UL 248-8, CSA C22.2
  • Applications: Motor circuits, feeder protection, panelboard mains, industrial power distribution
  • Fuse Class: J
  • Amperage: 200A
  • Mounting: Rejection-style (Class J rejection base required)
  • Interrupting Rating: 200kA RMS Sym. at 600VAC
  • Weight: 5.19 lb


Product Identification
  • UPC: 078200175345
  • GTIN: 00782001753450