Product Description
The Eaton Bussmann NO.663 fuse reducer allows a 30A fuse to safely fit into a 60A fuse block or holder. It is designed for use with Class H/K dimension fuse holders and panels. Rated for 600 V AC, this reducer maintains secure mechanical and electrical contact — enabling lower-amp fuses to be used in higher-amp fuse blocks when appropriate, while preserving UL/CSA safety compliance.
Use cases include retrofits, circuit reductions, or adapting older fuse panels to feed lower-amp circuits without changing the entire fuse block assembly.
Product Details
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Brand: Eaton Bussmann
- Condition: Used
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Model / Part Number: NO.663
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Type: Fuse Reducer / Fuse Block Adapter / Accessory for Fuse Holders
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Compatible Fuse Class: Class H / K (dimension-style fuses)
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Fuse Block Size Rating (Original): 60 A fuse block/holder
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Supported Fuse Amperage (Reduced): 1 A to 30 A fuses when used with NO.663 reducer
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Voltage Rating: 600 V AC
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Compliance / Certifications: UL Listed, CSA Certified, RoHS Compliant
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Physical Dimensions: Approximately 2.7 in (length) × 1.5 in (width) × 1.9 in (height)
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Fuse Material / Construction: Metal contacts to adapt fuse ends — designed for “dimension fuses” rather than standard cartridge or blade-end fuses.
Key Features
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Allows smaller (1 – 30 A) fuses to be used in 60 A fuse holders — ideal when circuit changes or load reductions require lower-amp protection.
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Compatible with Class H/K Bussmann “dimension” fuse holders — no need to replace existing fuse blocks.
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Rated for 600 V AC — suitable for typical commercial and industrial power distribution voltages.
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Maintains UL / CSA compliance and proper interrupt rating when used with correct fuse classes.
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Compact adapter design — reduces waste and avoids unneeded upgrade of entire fuse holder assemblies when only fuse size needs adjusting.
IS.10032024.07
