FWH-20A14F Equivalent & Substitute Parts

Part Overview

The FWH-20A14F is a 20A cartridge fuse rated for 500 VAC and 500 VDC operation, manufactured by Eaton - Bussmann Electrical Division. This component is actively produced and widely stocked (1007 pcs available). Cartridge fuses of this specification are essential in electrical and industrial applications where overcurrent protection and voltage isolation are required. Substitute parts may be necessary due to supply constraints, regional availability, or specific application requirements while maintaining equivalent electrical and mechanical performance.

Substiute Parts

FWH-20A14F

Eaton - Bussmann Electrical DivisionIn Stock: 1053FWH-20A14F Datasheet

Current PartRFQ

L50S020.T

Littelfuse Inc.In Stock: 1152L50S020.T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FWH-20A14F is determined by the following critical parameters:

• Current Rating: Must be 20A
• Voltage Rating - AC: Must be 500 VAC minimum
• Voltage Rating - DC: Must be 500 VDC minimum
• Fuse Type: Must be Cartridge
• Physical Dimensions: Must be 0.563" Dia x 2.000" L (14.30mm x 50.80mm)
• Mounting Type: Must require holder compatibility
• Approval Agencies: Must maintain CE, CSA, and UR certifications

The L50S020.T from Littelfuse Inc. meets the current rating, AC voltage rating, physical dimensions, mounting requirements, and regulatory certifications. However, the DC voltage rating is 450 VDC, which is below the 500 VDC specification of the main part.

Parameter Comparison

Engineering Selection Recommendations

Both the FWH-20A14F and L50S020.T are active products with equivalent regulatory certifications (CE, CSA, UR) and identical physical form factors. Selection between these parts should be based on the specific DC voltage requirement of the application:

• FWH-20A14F: Use when the application requires 500 VDC rated protection or operates at DC voltages approaching 500V.
• L50S020.T: Use when the application operates at DC voltages up to 450 VDC and AC voltage protection at 500 VAC is required.

Both parts maintain identical AC breaking capacity (200kA) and are physically interchangeable in holder-based installations. The L50S020.T exhibits lower DC breaking capacity (20kA versus 50kA), which may be a consideration in high-fault-current DC circuits.

Frequently Asked Questions (FAQ)

Q: Can L50S020.T be used as a direct replacement for FWH-20A14F?

A: Physical and AC electrical compatibility is confirmed. However, the L50S020.T has a 450 VDC rating versus the FWH-20A14F's 500 VDC rating. Substitution is only appropriate if the application's maximum DC voltage does not exceed 450V.

Q: Are the physical dimensions identical?

A: Yes. Both parts are 0.563" diameter by 2.000" length (14.30mm x 50.80mm) and are compatible with the same cartridge fuse holders.

Q: Do both parts have the same regulatory approvals?

A: Yes. Both parts carry CE, CSA, and UR certifications and are RoHS compliant.

Q: What is the difference in breaking capacity?

A: The FWH-20A14F has a 50kA DC breaking capacity, while the L50S020.T has a 20kA DC breaking capacity. Both maintain 200kA AC breaking capacity. In applications with high DC fault currents, the FWH-20A14F provides greater protection margin.

Q: Which part should I select for a new design?

A: Verify the maximum DC voltage and fault current requirements of your circuit. If DC voltage reaches 500V or fault current exceeds 20kA DC, use FWH-20A14F. If DC voltage remains below 450V and DC fault current does not exceed 20kA, either part is suitable based on availability and lead time.