FWA-250B Equivalent & Substitute Parts

Part Overview

The FWA-250B is a 250A cartridge fuse manufactured by Eaton - Bussmann Electrical Division, rated for 150 VAC and 150 VDC operation with bolt mount configuration. This component is designed for electrical and industrial applications requiring high-current protection with a breaking capacity of 100kA AC and 20kA DC. The part maintains Active product status and carries CE and UR approvals. Substitute parts are identified when equivalent electrical ratings, mechanical compatibility, and regulatory compliance can be maintained across alternative manufacturers.

Substiute Parts

FWA-250B

Eaton - Bussmann Electrical DivisionIn Stock: 649FWA-250B Datasheet

Current PartRFQ

L15S250.T

Littelfuse Inc.In Stock: 1025L15S250.T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FWA-250B is determined by the following critical parameters:

• Current Rating: 250A (exact match required)
• Voltage Rating - AC: 150 VAC (exact match required)
• Voltage Rating - DC: 150 VDC minimum (equal or higher acceptable)
• Fuse Type: Cartridge (exact match required)
• Mounting Type: Bolt Mount (exact match required)
• Package / Case: Cylindrical, Blade Terminal (Bolt) (exact match required)
• Size / Dimension: 1.000" Dia x 1.156" L ±0.001" (mechanical compatibility required)
• Breaking Capacity: 100kA AC, 20kA DC minimum (equal or higher acceptable)

The L15S250.T from Littelfuse Inc. qualifies as a substitute based on matching current rating, AC voltage rating, mounting configuration, and physical dimensions. The DC voltage rating of 100 VDC on the substitute is lower than the 150 VDC specification of the main part; therefore, this substitute is suitable only for applications where the maximum DC voltage requirement does not exceed 100 VDC.

Parameter Comparison

Engineering Selection Recommendations

The L15S250.T is electrically and mechanically compatible with the FWA-250B for applications operating at or below 100 VDC. Both parts maintain Active product status, carry CE and UR regulatory approvals, and meet RoHS compliance requirements. The L15S250.T provides additional CSA certification. Physical dimensions are compatible within standard manufacturing tolerances.

Selection of the L15S250.T as a substitute requires verification that the application's maximum DC voltage requirement does not exceed 100 VDC. For applications requiring the full 150 VDC DC rating of the FWA-250B, the original part specification must be maintained.

Frequently Asked Questions (FAQ)

Q: Can the L15S250.T replace the FWA-250B in all applications?

A: The L15S250.T is compatible for applications where the maximum DC voltage does not exceed 100 VDC. The FWA-250B is rated for 150 VDC. If your application requires 150 VDC operation, the FWA-250B must be used.

Q: Are the physical dimensions compatible?

A: Yes. The FWA-250B measures 1.000" Dia x 1.156" L, and the L15S250.T measures 1.000" Dia x 1.157" L. The 0.001" length difference is within standard manufacturing tolerances and does not affect bolt mount compatibility.

Q: What certifications does each part carry?

A: The FWA-250B carries CE and UR approvals. The L15S250.T carries CE, CSA, and UR approvals. Both meet the regulatory requirements for industrial electrical applications.

Q: Is the response time characteristic important for substitution?

A: The FWA-250B response time is not specified in the available data. The L15S250.T is rated as Fast Blow. If your circuit design depends on a specific response time characteristic, consult the detailed application requirements before substitution.

Q: Are both parts RoHS compliant?

A: Yes. The FWA-250B is RoHS Compliant, and the L15S250.T is ROHS3 Compliant. Both meet current RoHS requirements.

Q: What is the breaking capacity of these fuses?

A: Both the FWA-250B and L15S250.T have identical breaking capacity ratings of 100kA AC and 20kA DC at their respective rated voltages.