FWH-90B Equivalent & Substitute Parts

Part Overview

The FWH-90B is a 90A 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-90B

Eaton - Bussmann Electrical DivisionIn Stock: 975FWH-90B Datasheet

Current PartRFQ

FWH-90BC

Eaton - Bussmann Electrical DivisionIn Stock: 759FWH-90BC Datasheet

MFR RecommendedRFQ

L50S090.T

Littelfuse Inc.In Stock: 934L50S090.T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following critical parameters:

• Current Rating: 90A (exact match required)
• Voltage Rating - AC: 500 VAC (exact match required)
• Mounting Type: Bolt Mount (exact match required)
• Fuse Type: Cartridge (exact match required)
• Package / Case: Cylindrical, Blade Terminal (Bolt) (exact match required)

The FWH-90B has two identified substitute parts. The FWH-90BC is a manufacturer-recommended direct substitute from the same manufacturer with identical electrical and mechanical specifications but active product status. The L50S090.T from Littelfuse Inc. is a similar cartridge fuse meeting the core electrical parameters with minor variations in DC voltage rating and breaking capacity specifications.

Parameter Comparison

Engineering Selection Recommendations

The FWH-90BC is the primary substitute for the obsolete FWH-90B. Both parts are manufactured by Eaton - Bussmann Electrical Division and share identical electrical ratings, breaking capacity, and mechanical specifications. The FWH-90BC carries active product status and holds expanded approval certifications (CE, CSA, UL) compared to the original part (CE, UR), providing enhanced compliance coverage.

The L50S090.T from Littelfuse Inc. is a secondary substitute option. While it maintains the 90A current rating, 500 VAC voltage rating, and identical mounting configuration, it operates at a reduced DC voltage rating of 450 VDC compared to the 500 VDC specification of the FWH-90B. Additionally, the DC breaking capacity is reduced to 20kA compared to 50kA. The L50S090.T is suitable only for applications where the DC voltage requirement does not exceed 450 VDC and where the lower DC breaking capacity is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the FWH-90BC directly replace the FWH-90B?

A: Yes. The FWH-90BC is the manufacturer-recommended substitute with identical current rating (90A), voltage ratings (500 VAC/500 VDC), mounting type (bolt mount), and breaking capacity specifications. The primary difference is product status: FWH-90BC is active while FWH-90B is obsolete.

Q: What are the limitations of using the L50S090.T as a substitute?

A: The L50S090.T has a reduced DC voltage rating of 450 VDC instead of 500 VDC and a lower DC breaking capacity of 20kA instead of 50kA. It is suitable only for applications where DC voltage does not exceed 450 VDC and where the reduced breaking capacity meets system requirements.

Q: Are there physical dimension differences between these parts?

A: Yes. The FWH-90B and FWH-90BC share the same cylindrical, blade terminal (bolt) package configuration. The L50S090.T has different dimensions: 1.000" Dia x 2.126" L (25.40mm x 54.00mm) compared to the FWH series standard dimensions of 0.950" Dia x 1.740" L (24.13mm x 44.20mm). Physical dimensions must be verified for mechanical fit in the application.

Q: Which certifications apply to each part?

A: FWH-90B holds CE and UR certifications. FWH-90BC holds CE, CSA, and UL certifications. L50S090.T holds CE, CSA, and UR certifications. Application requirements determine which certification set is necessary.

Q: What is the response time classification for these fuses?

A: The FWH-90B response time is not specified. The FWH-90BC is classified as Fast Blow. The L50S090.T is classified as Fast Blow. Response time characteristics should be evaluated against application requirements.