FWP-400A Equivalent & Substitute Parts

Part Overview

The FWP-400A is a 400A cartridge fuse manufactured by Eaton - Bussmann Electrical Division, rated for 700 VAC and 700 VDC operation. This component is designed for bolt mount installation in industrial and electrical applications requiring high-current protection. The part maintains Active product status with 2170 units in current inventory. Substitute parts are identified when equivalent electrical ratings and mechanical compatibility are maintained across the specified parameters.

Substiute Parts

FWP-400A

Eaton - Bussmann Electrical DivisionIn Stock: 2245FWP-400A Datasheet

Current PartRFQ

L70S400.V

Littelfuse Inc.In Stock: 1113L70S400.V Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FWP-400A is determined by the following criteria:

• Current Rating: Must match 400A exactly
• Voltage Rating - AC: Must match or exceed 700 VAC
• Voltage Rating - DC: Must match or exceed 700 VDC
• Mounting Type: Must be Bolt Mount
• Fuse Type: Must be Cartridge
• Package / Case: Must be Cylindrical with Blade Terminal (Bolt)
• Approval Agencies: Must maintain CE, CSA, and UR certifications

The L70S400.V from Littelfuse Inc. qualifies as a substitute based on matching current rating, AC voltage rating, mounting type, fuse type, and package configuration. The DC voltage rating of 650 VDC is lower than the 700 VDC specification of the main part; however, this represents a constraint on DC application scope rather than a disqualification for AC-primary applications.

Parameter Comparison

Engineering Selection Recommendations

Both the FWP-400A and L70S400.V maintain Active product status and carry identical approval certifications (CE, CSA, UR), establishing baseline regulatory compliance for either selection.

The FWP-400A provides full 700 VDC rating and higher DC breaking capacity (50kA versus 20kA). Selection of the FWP-400A is appropriate for applications requiring the complete 700 VDC specification or where DC breaking capacity exceeding 20kA is necessary.

The L70S400.V operates at 650 VDC maximum and delivers 200kA AC breaking capacity matching the FWP-400A. This substitute is suitable for applications where the DC voltage requirement does not exceed 650 VDC and where the 20kA DC breaking capacity is sufficient. The L70S400.V features a shorter physical length (2.843" versus 5.090"), which may present mechanical installation considerations in existing mounting configurations.

Both parts maintain RoHS compliance and are currently in active production with available inventory.

Frequently Asked Questions (FAQ)

Q: Can the L70S400.V replace the FWP-400A in all applications?

A: The L70S400.V is suitable for applications where the DC voltage requirement does not exceed 650 VDC and the DC breaking capacity of 20kA is adequate. Applications requiring the full 700 VDC rating or higher DC breaking capacity must use the FWP-400A.

Q: What is the significance of the physical dimension difference between these parts?

A: The FWP-400A measures 5.090" in length while the L70S400.V measures 2.843" in length. Both maintain the same 2.000" diameter. Existing mounting hardware and enclosure configurations must accommodate the selected part's physical dimensions.

Q: Are both parts certified to the same standards?

A: Yes. Both the FWP-400A and L70S400.V carry CE, CSA, and UR approvals, meeting equivalent regulatory requirements for industrial and electrical applications.

Q: What is the difference in breaking capacity between these parts?

A: The FWP-400A provides 200kA AC and 50kA DC breaking capacity. The L70S400.V provides 200kA AC and 20kA DC breaking capacity. AC breaking capacity is identical; DC breaking capacity differs by 30kA.

Q: Are both parts RoHS compliant?

A: Yes. The FWP-400A is RoHS Compliant. The L70S400.V is ROHS3 Compliant. Both meet current RoHS requirements.