Equivalent & Substitute Parts for BK/C518-4-R

Part Overview

The BK/C518-4-R is a 4A 250VAC fast-blow glass cartridge fuse manufactured by Eaton - Electronics Division. This through-hole component is designed for circuit protection in applications requiring 250V AC/DC rated protection. The part is currently active in production with 797 units in stock. Substitute parts are identified when equivalent electrical and mechanical parameters align with application requirements, allowing for component interchangeability in compatible circuit designs.

Substiute Parts

BK/C518-4-R

Eaton - Electronics DivisionIn Stock: 896BK/C518-4-R Datasheet

Current PartRFQ

0224004.HXUP

Littelfuse Inc.In Stock: 8440224004.HXUP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BK/C518-4-R is determined by alignment of the following critical parameters:

Current Rating Match: Both parts must carry identical 4A current ratings to ensure equivalent protection characteristics.

Fuse Type & Response Time: Both parts must be fast-blow glass cartridge fuses to maintain consistent circuit protection behavior.

Package & Mounting: Both parts must use the 2AG form factor with through-hole mounting to ensure mechanical compatibility with existing PCB layouts and fuse holders.

Voltage Rating Consideration: The substitute part (0224004.HXUP) carries a 125VAC rating, which is lower than the main part's 250VAC rating. This represents a voltage derating and restricts substitution to applications operating at or below 125VAC.

Mechanical Dimensions: Physical dimensions must remain compatible with standard 2AG fuse holders, though minor dimensional variations are acceptable within the 2AG specification.

The identified substitute part 0224004.HXUP from Littelfuse Inc. meets the current rating, fuse type, response time, and package requirements. However, the voltage rating difference establishes a directional substitution relationship: the BK/C518-4-R can substitute for 0224004.HXUP in 125VAC applications, but 0224004.HXUP cannot substitute for BK/C518-4-R in 250VAC applications.

Parameter Comparison

Engineering Selection Recommendations

For 250VAC Applications: The BK/C518-4-R is the appropriate selection. The Littelfuse 0224004.HXUP substitute carries a maximum 125VAC rating and is not suitable for 250VAC circuits.

For 125VAC Applications: Either part may be selected based on availability and supply chain requirements. Both parts carry active product status and maintain current production. The BK/C518-4-R provides additional voltage margin in 125VAC applications due to its 250VAC rating. The 0224004.HXUP offers broader international approvals (CE, PSE) in addition to CSA and UL certifications.

Compliance Considerations: Both parts maintain RoHS compliance and carry UL/CSA approvals suitable for North American markets. The Littelfuse part includes additional CE and PSE certifications for expanded geographic applicability.

Inventory & Availability: BK/C518-4-R: 797 units in stock. 0224004.HXUP: 834 units in stock. Both parts are available for immediate procurement.

Frequently Asked Questions (FAQ)

Q: Can 0224004.HXUP replace BK/C518-4-R in all applications?

A: No. The 0224004.HXUP is rated for 125VAC maximum, while BK/C518-4-R is rated for 250VAC. Substitution is only valid in applications operating at 125VAC or below.

Q: Can BK/C518-4-R replace 0224004.HXUP?

A: Yes. The BK/C518-4-R carries a higher voltage rating (250VAC) and identical current rating (4A), making it suitable for any application designed for the Littelfuse part.

Q: Are the physical dimensions identical?

A: Both parts use the 2AG form factor with nominal dimensions of 5mm x 15mm. Minor dimensional variations exist (BK/C518-4-R: 5.50mm x 15.20mm; 0224004.HXUP: 4.70mm x 14.48mm), but both fit standard 2AG fuse holders.

Q: What is the difference in breaking capacity?

A: BK/C518-4-R has 200A breaking capacity at rated voltage; 0224004.HXUP has 100A. This reflects the voltage rating difference and affects maximum fault current handling capability.

Q: Do both parts have the same response time?

A: Yes. Both are fast-blow fuses with identical response characteristics for circuit protection applications.

Q: Which certifications apply to each part?

A: BK/C518-4-R: CSA, UL. 0224004.HXUP: CE, CSA, PSE, UL. The Littelfuse part carries additional international certifications.

Q: Are there RoHS compliance differences?

A: Both parts are RoHS compliant. BK/C518-4-R is RoHS Compliant; 0224004.HXUP is ROHS3 Compliant, representing a more recent compliance standard.