FWA-400B Equivalent & Substitute Parts

Part Overview

The FWA-400B is a 400A 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 is RoHS compliant, making it suitable for modern industrial installations. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when inventory requirements necessitate qualified alternatives.

Substiute Parts

FWA-400B

Eaton - Bussmann Electrical DivisionIn Stock: 953FWA-400B Datasheet

Current PartRFQ

L15S400.T

Littelfuse Inc.In Stock: 1065L15S400.T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FWA-400B is determined by the following critical parameters:

• Current Rating: 400A (exact match required)
• Voltage Rating - AC: 150 VAC (exact match required)
• 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 or equivalent tolerance (exact match required)
• Breaking Capacity: 100kA AC minimum, 20kA DC minimum (equal or greater acceptable)

The L15S400.T from Littelfuse Inc. qualifies as a substitute based on matching current rating, AC voltage rating, fuse type, mounting configuration, and physical dimensions. The DC voltage rating of the L15S400.T is 100 VDC, which is lower than the FWA-400B specification of 150 VDC. This difference must be evaluated against the specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Both the FWA-400B and L15S400.T maintain active product status and meet current industry compliance standards. The FWA-400B carries CE and UR approvals, while the L15S400.T carries CE, CSA, and UR approvals, providing broader regulatory coverage. Both components are RoHS compliant, with the L15S400.T meeting ROHS3 specifications.

The primary technical distinction is the DC voltage rating: the FWA-400B is rated for 150 VDC while the L15S400.T is rated for 100 VDC. Selection between these parts must be based on the actual DC voltage present in the application circuit. For applications operating at or below 100 VDC, the L15S400.T is electrically equivalent. For applications requiring 150 VDC capability, the FWA-400B is the appropriate selection.

Physical dimensions are equivalent within manufacturing tolerance (0.001" difference in length). Both components feature identical current ratings, AC voltage ratings, breaking capacity, and mounting configurations.

Frequently Asked Questions (FAQ)

Q: Can the L15S400.T replace the FWA-400B in all applications?

A: The L15S400.T is electrically equivalent for applications operating at 100 VDC or below. If the application circuit operates at voltages between 100 VDC and 150 VDC, the FWA-400B must be used to maintain rated protection.

Q: Are the physical dimensions compatible for direct mounting?

A: Yes. Both components feature 1.000" diameter cylindrical cases with bolt mount blade terminals. The length difference of 0.001" (1.156" versus 1.157") is within standard manufacturing tolerance and does not affect mounting compatibility.

Q: What is the difference between the response times?

A: The L15S400.T is specified as Fast Blow. The FWA-400B response time is not specified in the available data. Response time characteristics should be verified against application requirements if this parameter is critical to circuit protection strategy.

Q: Do both parts meet current regulatory requirements?

A: Yes. Both components are RoHS compliant and carry CE approval. The L15S400.T additionally carries CSA approval, providing broader regulatory acceptance in North American markets.

Q: What is the significance of the breaking capacity rating?

A: Both components are rated for 100kA AC and 20kA DC breaking capacity at their respective rated voltages. This specification defines the maximum fault current the fuse can safely interrupt without component failure or hazard.