FWH-90A Equivalent & Substitute Parts Reference

Part Overview

The FWH-90A is a 90A cartridge fuse manufactured by Eaton - Bussmann Electrical Division, rated for 500 VAC and 500 VDC operation. This component is designed for bolt mount installation in electrical and industrial applications requiring high breaking capacity (200kA AC, 50kA DC). The part maintains Active product status with 987 units in current inventory. Substitute parts are identified when equivalent electrical ratings and mechanical compatibility are maintained across manufacturers while meeting the same approval standards.

Substiute Parts

FWH-90A

Eaton - Bussmann Electrical DivisionIn Stock: 1024FWH-90A Datasheet

Current PartRFQ

L50S090.T

Littelfuse Inc.In Stock: 934L50S090.T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FWH-90A is determined by the following critical parameters:

• Current Rating: Must be 90A
• Voltage Rating - AC: Must be 500 VAC minimum
• Voltage Rating - DC: Must be 500 VDC minimum
• Mounting Type: Must be Bolt Mount
• Fuse Type: Must be Cartridge
• Package / Case: Must be Cylindrical with Blade Terminal (Bolt)
• Approval Agencies: Must include CE, CSA, and UR certifications

The L50S090.T from Littelfuse Inc. qualifies as a substitute based on matching current rating, AC voltage rating, mounting type, fuse type, and package configuration. However, the DC voltage rating of 450 VDC is below the 500 VDC requirement of the main part, and the breaking capacity at rated voltage differs (20kA DC versus 50kA DC). These differences must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Both the FWH-90A and L50S090.T maintain Active product status and carry identical approval certifications (CE, CSA, UR), confirming compliance with international electrical safety standards. The FWH-90A provides a 500 VDC rating with 50kA DC breaking capacity, while the L50S090.T operates at 450 VDC with 20kA DC breaking capacity. Selection between these components depends on the specific DC voltage and fault current requirements of the application circuit. The FWH-90A is suitable for systems requiring full 500 VDC operation and higher DC fault current handling. The L50S090.T is applicable in circuits where the 450 VDC rating is sufficient and lower DC breaking capacity is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the L50S090.T replace the FWH-90A in all applications?

A: The L50S090.T matches the FWH-90A in current rating (90A), AC voltage rating (500 VAC), mounting type (Bolt Mount), and package configuration (Cylindrical, Blade Terminal). However, the DC voltage rating is 450 VDC versus 500 VDC, and the DC breaking capacity is 20kA versus 50kA. Substitution is valid only when the application circuit operates at or below 450 VDC and does not require the higher DC breaking capacity of the FWH-90A.

Q: What is the significance of breaking capacity in fuse selection?

A: Breaking capacity defines the maximum fault current a fuse can safely interrupt at its rated voltage without rupturing or creating a hazard. The FWH-90A breaks 50kA DC at rated voltage, while the L50S090.T breaks 20kA DC. Applications with higher fault currents require the higher breaking capacity rating.

Q: Are both parts RoHS compliant?

A: Yes. The FWH-90A is RoHS Compliant, and the L50S090.T is ROHS3 Compliant. Both meet environmental compliance requirements for restricted substances.

Q: What approval agencies certify these fuses?

A: Both the FWH-90A and L50S090.T carry CE, CSA, and UR certifications, confirming compliance with European, Canadian, and Underwriters Laboratories safety standards respectively.

Q: Does response time affect substitution compatibility?

A: The FWH-90A response time is not specified in the provided data. The L50S090.T is rated as Fast Blow. Response time characteristics may influence circuit protection behavior and should be evaluated against application requirements if specified.