NO.663 Fuse Reducer – Electrical Fuse Reducer for Class H/K and R Fuses

The NO.663 Fuse Reducer from Bussmann is designed to install on fuse ferrules or blades, enabling the use of smaller size fuses than those originally specified for fuse blocks or holders. This product is suitable for electrical distributors and switchgear suppliers requiring reliable fuse size adaptation for Class H, K, and R ferrule and blade fuses in industrial and commercial electrical systems.

Specifications

• Voltage Rating: 250 V (Class H, K, and R)
• Current Rating: 30 to 600 A
• Short-Circuit Current Rating (SCCR): Up to fuse interrupting rating
• Agency Approvals: UL Listed (Guide IZZR, File E12853), CSA Certified (Class 6225-01, File 47235), RoHS compliant
• Product Weight: 0.2000 lb
• Catalog Number: NO.663

Features

• Allows application of smaller size fuses in fuse blocks or holders designed for larger fuses
• Compatible with Class H, K, and R ferrule and blade fuses
• Maintains strong mechanical and electrical contact
• Fits into most panels or switches, including dead-front type
• Designed specifically for 250 V fuse blocks; no reducers for mixing 250 V and 600 V fuse blocks

Downloads & Links

• Data Sheet
• Catalog
• Specification/Technical