FWH-175B Equivalent & Substitute Parts

Part Overview

The FWH-175B is a 175A cartridge fuse rated for 500 VAC and 500 VDC operation, manufactured by Eaton - Bussmann Electrical Division. This component is designed for electrical and industrial applications requiring high-breaking capacity protection (200kA AC, 50kA DC). The part is currently active in production with 902 units in stock. Substitute parts may be required due to availability constraints, regional sourcing preferences, or specific application requirements within the allowed electrical and mechanical parameter ranges.

Substiute Parts

FWH-175B

Eaton - Bussmann Electrical DivisionIn Stock: 980FWH-175B Datasheet

Current PartRFQ

L50S175.V

Littelfuse Inc.In Stock: 949L50S175.V Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FWH-175B is determined by the following critical parameters:

• Current Rating: Must be 175A
• Voltage Rating - AC: Must be 500 VAC minimum
• Voltage Rating - DC: Must be 500 VDC minimum
• Fuse Type: Must be Cartridge
• Package / Case: Must be Cylindrical with Blade Terminal (Bolt)
• Mounting Configuration: Must support Bolt Mount installation

The L50S175.V from Littelfuse Inc. meets these core electrical and mechanical requirements. While dimensional variations and DC breaking capacity differences exist, the substitute maintains functional equivalence within the specified parameter constraints for this product category.

Parameter Comparison

Engineering Selection Recommendations

FWH-175B (Eaton - Bussmann) is the primary specification when:

• DC voltage environment reaches 500 VDC
• DC breaking capacity requirement is 50kA or higher
• Space constraints require the smaller cylindrical form factor (29.36mm diameter)
• UR certification alone is sufficient for the application

L50S175.V (Littelfuse POWR-GARD®) is an acceptable substitute when:

• DC voltage environment does not exceed 450 VDC
• DC breaking capacity requirement is 20kA or lower
• Larger form factor (31.00mm diameter, 54.00mm length) is accommodated in the holder assembly
• Fast Blow response time is compatible with the circuit protection scheme
• CSA certification provides additional regional compliance value

Both parts carry CE and UR approvals and maintain RoHS compliance. Dimensional differences require verification that the substitute cartridge physically fits within the existing fuse holder assembly.

Frequently Asked Questions (FAQ)

Q: Can L50S175.V replace FWH-175B in all applications?

A: No. The L50S175.V has a lower DC voltage rating (450 VDC vs. 500 VDC) and reduced DC breaking capacity (20kA vs. 50kA). Substitution is valid only when the application operates at or below 450 VDC and requires DC breaking capacity of 20kA or less.

Q: What are the dimensional differences, and do they matter?

A: The L50S175.V is larger (1.220" Dia x 2.126" L) compared to the FWH-175B (1.156" Dia x 1.836" L). Physical fit within the fuse holder assembly must be confirmed before substitution. Holder compatibility is critical for safe operation.

Q: Are both parts RoHS compliant?

A: Yes. The FWH-175B is RoHS Compliant, and the L50S175.V is ROHS3 Compliant. Both meet current environmental standards.

Q: What is the significance of "Fast Blow" on the L50S175.V?

A: Fast Blow indicates the fuse responds quickly to overcurrent conditions. This response time characteristic must be compatible with the circuit protection design. The FWH-175B response time is not specified in the provided data.

Q: Do both parts have the same breaking capacity?

A: AC breaking capacity is identical (200kA). DC breaking capacity differs: FWH-175B provides 50kA, while L50S175.V provides 20kA. Application requirements determine which is acceptable.

Q: Which certifications does each part carry?

A: FWH-175B carries CE and UR approvals. L50S175.V carries CE, CSA, and UR approvals. The L50S175.V provides additional CSA certification for North American applications.