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Fuse Reducer 600V Class J 30 - 60 Class J Fuse Reducer · Ferraz Shawmut Mersen J636
SKU: MER-J636
Class J fuse reducer pair for using a 30A, 600V fuse in existing 60A Class J fuse clips. Commonly used when equipment has 60A clips but branch protection needs to be reduced to 30A without changing the holder, subject to equipment rating and local electrical code.
What this product is for
The Mersen J636 is a Class J fuse reducer pair used to fit a 30A Class J fuse into existing 60A Class J fuse clips. It helps electricians and maintenance teams adapt installed fuse hardware when the required fuse ampere rating is lower than the clip rating.
Use for
- Reducing a 60A Class J fuse clip application to accept a 30A Class J fuse
- Retrofit and maintenance work where replacing the full fuse block or switch hardware is not practical
- Industrial control panels, disconnects, and fused equipment using 600V Class J fuse provisions
Avoid for
- Bolt-on fuse applications
- Fuse classes other than Class J
- Applications where the equipment, holder, or code requirements do not permit fuse reducers
Best for
Best for service and retrofit jobs where installed equipment already has 60A Class J clips and the circuit now requires 30A Class J overcurrent protection. This can reduce changeout time compared with replacing the complete fuse mounting hardware.
Installed in
Typically installed in Class J fuse clips within switchboards, fused disconnects, industrial machinery, and other 600V distribution or control equipment. Actual fit depends on the fuse holder design and clip condition.
Why this product exists
Fuse reducers allow lower ampere Class J fuses to be used in higher rated existing clips. In practical terms, this helps match branch circuit protection to the load or equipment requirement without replacing otherwise serviceable 60A Class J fuse hardware.
Compared with similar products
Compared with replacing the full fuse block or switch assembly, a fuse reducer pair is a simpler retrofit accessory when the fuse class, voltage, and holder arrangement already match. This J636 model is specifically for Class J rejection-style applications from 30A to 60A and is not a general-purpose reducer for other fuse classes.
Specifications
- Manufacturer: Mersen
- Part number: J636
- Product type: Fuse reducer pair
- Fuse class: Class J
- Application: Allows 30A fuse to fit 60A clips
- Fuse rating used: 30A
- Clip rating: 60A
- Voltage rating: 600V
- Style: Rejection style
- Approvals: UL, CSA approval listed by distributor sources
- Typical use: Retrofit of existing 60A Class J fuse clip installations
Typical buying guidance: use this accessory when the installed hardware is 60A Class J but the required fuse size is 30A. Actual suitability depends on the equipment listing, available fault current, installation conditions, and local electrical code.
- ApplicationAllows 30A fuse to fit 60A clips | Retrofit of existing 60A Class J fuse cl
- Voltage600V
- Fuse ClassClass J
- ApprovalsUL, CSA approval listed by distributor sources
- StyleRejection style
- BrandsFerraz Shawmut Mersen
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Delivery charges may apply outside regular local routes, for smaller orders, or for oversized and heavy items.
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