FWH-80B Equivalent & Substitute Parts

Part Overview

The FWH-80B is an 80A cartridge fuse rated for 500 VAC and 500 VDC operation with bolt mount configuration, manufactured by Eaton - Bussmann Electrical Division. This part is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain system continuity and ensure procurement of functionally compatible components for electrical and industrial applications.

Substiute Parts

FWH-80B

Eaton - Bussmann Electrical DivisionIn Stock: 950FWH-80B Datasheet

Current PartRFQ

FWH-80BC

Eaton - Bussmann Electrical DivisionIn Stock: 1063FWH-80BC Datasheet

MFR RecommendedRFQ

L50S080.T

Littelfuse Inc.In Stock: 758L50S080.T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FWH-80B are identified based on the following critical parameters that must match or exceed the original specification:

• Current Rating: 80A (exact match required)
• Voltage Rating - AC: 500 VAC (minimum requirement)
• Voltage Rating - DC: 500 VDC or higher (minimum requirement)
• Mounting Type: Bolt Mount (mechanical compatibility)
• Fuse Type: Cartridge (form factor requirement)
• Package / Case: Cylindrical, Blade Terminal (Bolt) (physical compatibility)
• Breaking Capacity: Must support 200kA AC at rated voltage

Two substitute parts meet these criteria: the FWH-80BC (manufacturer recommended) and the L50S080.T (similar alternative).

Parameter Comparison

Engineering Selection Recommendations

FWH-80BC (Manufacturer Recommended Substitute)

The FWH-80BC is the primary substitute for the obsolete FWH-80B. Both parts are manufactured by Eaton - Bussmann and share identical electrical specifications: 80A current rating, 500 VAC/500 VDC voltage ratings, 200kA AC breaking capacity, and 305 melting I²t. The FWH-80BC is active in production and carries expanded certifications (CE, CSA, UL) compared to the original part (CE, UR). This part is the direct replacement for applications requiring seamless compatibility.

L50S080.T (Similar Alternative)

The L50S080.T from Littelfuse Inc. (POWR-GARD® L50S series) provides an alternative substitute with matching current rating, AC voltage rating, and breaking capacity. However, the DC voltage rating is 450 VDC, which is 50V lower than the original 500 VDC specification. The breaking capacity at rated voltage is also reduced to 20kA DC compared to the original 50kA DC. This part is suitable only for applications where the 450 VDC DC rating is acceptable. The L50S080.T carries CE, CSA, and UR certifications and is active in production.

Frequently Asked Questions (FAQ)

Q: Can the FWH-80BC directly replace the FWH-80B?

A: Yes. The FWH-80BC matches all critical electrical parameters of the FWH-80B: 80A current rating, 500 VAC/500 VDC voltage ratings, 200kA AC breaking capacity, and 305 melting I²t. Both use bolt mount cartridge configuration with cylindrical blade terminals. The FWH-80BC is the manufacturer-recommended substitute.

Q: What is the key difference between FWH-80BC and L50S080.T?

A: The primary difference is the DC voltage rating. The FWH-80BC maintains the original 500 VDC rating, while the L50S080.T is rated for 450 VDC. Additionally, the L50S080.T has a reduced DC breaking capacity of 20kA compared to 50kA for the FWH-80BC. Both maintain the 80A current rating and 500 VAC AC specification.

Q: Are there physical dimension differences between these parts?

A: Yes. The FWH-80BC dimensions are 0.950" Dia x 1.740" L (24.13mm x 44.20mm). The L50S080.T dimensions are 1.000" Dia x 2.126" L (25.40mm x 54.00mm). Physical mounting space must be verified before substitution.

Q: Which certifications apply to each substitute?

A: The FWH-80BC carries CE, CSA, and UL certifications. The L50S080.T carries CE, CSA, and UR certifications. Both meet the original CE and UR certifications of the FWH-80B, with the FWH-80BC offering additional UL certification.

Q: Can I use the L50S080.T in a 500 VDC application?

A: No. The L50S080.T is rated for 450 VDC maximum. Using it in a 500 VDC circuit exceeds its voltage rating and is not permitted. The FWH-80BC must be used for 500 VDC applications.