FWA-500ASI4 Equivalent & Substitute Parts

Part Overview

The FWA-500ASI4 is a 500A fuse cartridge manufactured by Eaton - Bussmann Electrical Division, rated for 150 VAC and 150 VDC operation. This component is designed for bolt mount installation in electrical and industrial applications requiring high-current protection with fast-acting response characteristics. The part maintains Active product status with 1118 units in current inventory. Substitute parts are identified when equivalent electrical ratings, mechanical compatibility, and approval certifications align with the original specification, enabling component interchangeability in system designs.

Substiute Parts

FWA-500ASI4

Eaton - Bussmann Electrical DivisionIn Stock: 1180FWA-500ASI4 Datasheet

Current PartRFQ

L15S500.V

Littelfuse Inc.In Stock: 1009L15S500.V Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FWA-500ASI4 are qualified based on the following critical parameters:

Electrical Compatibility:

• Current Rating: 500A (exact match required)
• Voltage Rating - AC: 150 VAC (exact match required)
• Mounting Type: Bolt Mount (mechanical compatibility)
• Package / Case: Cylindrical, Blade Terminal (Bolt) (physical fit requirement)
• Size / Dimension: Compatible within tolerance (38.10mm diameter, approximately 31.75mm length)

Operational Characteristics:

• Fuse Type: Cartridge (functional equivalence)
• Breaking Capacity: Minimum 100kA AC, 20kA DC (system protection adequacy)

Regulatory & Compliance:

• Approval Agency: CE and/or UR certification (market acceptance)
• RoHS Status: RoHS Compliant or ROHS3 Compliant (environmental compliance)

The L15S500.V from Littelfuse Inc. qualifies as a substitute based on matching current rating (500A), AC voltage rating (150 VAC), mounting configuration (Bolt Mount), physical dimensions (1.500" Dia x 1.252" L), and regulatory certifications (CE, CSA, UR). The DC voltage rating differential (100 VDC vs. 150 VDC) and breaking capacity variation (100kA AC vs. 200kA AC) represent the primary technical distinctions between these components.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (FWA-500ASI4): The FWA-500ASI4 remains the specified component for applications requiring 150 VDC operation and 200kA AC breaking capacity. This part maintains Active product status with established inventory availability (1118 units) and dual certification (CE, UR). The higher DC voltage rating and breaking capacity provide margin for systems operating at or near maximum DC voltage specifications.

Substitute Selection (L15S500.V): The L15S500.V qualifies as an equivalent substitute for applications where the DC voltage requirement does not exceed 100 VDC and the AC breaking capacity requirement does not exceed 100kA. This component carries expanded regulatory approval (CE, CSA, UR) and ROHS3 compliance status. The Fast Blow response characteristic aligns with semiconductor protection applications. Physical dimensions remain compatible with bolt mount installations designed for the FWA-500ASI4 form factor.

Compliance Considerations: Both components maintain Active product status and meet RoHS environmental compliance requirements. The L15S500.V provides additional CSA certification beyond the FWA-500ASI4 specification. Selection between these parts should be based on specific system voltage and breaking capacity requirements rather than general interchangeability assumptions.

Frequently Asked Questions (FAQ)

Q: Can the L15S500.V replace the FWA-500ASI4 in all applications?

A: No. The L15S500.V is suitable only for applications where the DC voltage requirement does not exceed 100 VDC and the AC breaking capacity requirement does not exceed 100kA. The FWA-500ASI4 is required for systems specified at 150 VDC operation or requiring 200kA AC breaking capacity.

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

A: Breaking capacity defines the maximum fault current the fuse can safely interrupt without rupturing or creating a hazard. The FWA-500ASI4 (200kA AC, 20kA DC) provides higher fault current handling than the L15S500.V (100kA AC, 20kA DC). System design must ensure the selected fuse breaking capacity exceeds the maximum available fault current at the installation point.

Q: Are the physical dimensions identical between these parts?

A: The dimensions are nearly identical. Both components measure 1.500" diameter with lengths of 1.250" (FWA-500ASI4) and 1.252" (L15S500.V), representing a 0.002" difference. Both feature cylindrical form factors with blade terminal bolt mount configurations, ensuring mechanical compatibility in standard bolt mount fuse holders.

Q: What does "Fast Blow" response mean for the L15S500.V?

A: Fast Blow indicates the fuse element melts and opens the circuit rapidly in response to overcurrent conditions. This characteristic is specified for the L15S500.V and is suitable for semiconductor protection applications where rapid response to transient overcurrents is required.

Q: Do both parts meet current environmental compliance standards?

A: Yes. The FWA-500ASI4 is RoHS Compliant, and the L15S500.V is ROHS3 Compliant. Both meet current environmental compliance requirements for electronic component manufacturing and use in regulated markets.

Q: What certifications should I verify for my specific application?

A: The FWA-500ASI4 carries CE and UR certifications. The L15S500.V carries CE, CSA, and UR certifications. Verify that the selected component's certification marks align with your application's regulatory requirements and regional standards.