Equivalent & Substitute Parts for BK/C520-2.5-R

Part Overview

The BK/C520-2.5-R is a 2.5 A, 250 V AC fast-blow glass cartridge fuse manufactured by Eaton - Electronics Division. This component is classified as Active and is designed for use in 2AG holder assemblies. The fuse operates at 250 V AC with a breaking capacity of 100 A at rated voltage and a melting I²t of 2.9. Substitute parts are necessary when inventory availability is limited, when alternative voltage ratings (including DC capability) are required, or when different manufacturer certifications are needed for specific applications.

Substiute Parts

BK/C520-2.5-R

Eaton - Electronics DivisionIn Stock: 812BK/C520-2.5-R Datasheet

Current PartRFQ

022502.5HXP

Littelfuse Inc.In Stock: 1426022502.5HXP Datasheet

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022502.5MXP

Littelfuse Inc.In Stock: 1600022502.5MXP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the BK/C520-2.5-R is permissible with parts that maintain the following critical parameters:

• Current Rating: 2.5 A (exact match required)
• Voltage Rating - AC: 250 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Package / Case: 2AG, 5mm x 15mm (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Requires Holder (exact match required)

The substitute parts identified—Littelfuse Inc. models 022502.5HXP and 022502.5MXP—satisfy all critical parameters. Both substitute parts provide additional DC voltage capability (125 V DC) and extended operating temperature ranges (-55°C to 125°C), which represent enhancements over the main part specification. Both substitute parts maintain the same 100 A breaking capacity at rated AC voltage and are classified as Active products.

Parameter Comparison

Engineering Selection Recommendations

Both Littelfuse substitute parts (022502.5HXP and 022502.5MXP) are suitable replacements for the BK/C520-2.5-R based on electrical and mechanical compatibility. All three parts maintain Active product status and ROHS3 compliance.

The Littelfuse parts provide broader certification coverage (CE, CSA, PSE, UL) compared to the Eaton part (CSA, UL), making them applicable in markets requiring PSE certification. The Littelfuse parts also specify operating temperature ranges (-55°C to 125°C), whereas the Eaton part does not provide this specification.

The melting I²t values differ slightly (2.9 for Eaton versus 2.68 for Littelfuse), and the DC cold resistance is lower in the Littelfuse parts (0.0372 Ohms versus 0.046 Ohms). These differences remain within acceptable tolerance for fast-blow cartridge fuse applications at the specified 2.5 A rating.

Selection between 022502.5HXP and 022502.5MXP should be based on inventory availability and application-specific requirements, as both parts are electrically and mechanically identical.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 022502.5HXP or 022502.5MXP be used as direct replacements for the Eaton BK/C520-2.5-R?

A: Yes. Both Littelfuse parts maintain the same current rating (2.5 A), AC voltage rating (250 V), fuse type (cartridge, glass), package format (2AG, 5mm x 15mm), response time (fast blow), and breaking capacity (100 A at rated voltage). All three parts are classified as Active products and are ROHS3 compliant.

Q: What is the difference between the two Littelfuse substitute parts?

A: The 022502.5HXP and 022502.5MXP are electrically and mechanically identical. Both provide 2.5 A at 250 V AC, 125 V DC capability, identical breaking capacity, and the same operating temperature range. Selection should be based on inventory availability.

Q: Do the substitute parts provide DC voltage capability?

A: Yes. Both Littelfuse parts (022502.5HXP and 022502.5MXP) are rated for 125 V DC, whereas the Eaton BK/C520-2.5-R does not specify a DC voltage rating. This represents an enhancement for applications requiring DC circuit protection.

Q: Are there differences in certifications between the main part and substitutes?

A: The Eaton BK/C520-2.5-R carries CSA and UL certifications. The Littelfuse substitutes carry CE, CSA, PSE, and UL certifications. The additional PSE certification on Littelfuse parts extends applicability to markets requiring Japanese regulatory compliance.

Q: What is the significance of the melting I²t difference?

A: The melting I²t values (2.9 for Eaton, 2.68 for Littelfuse) indicate the thermal energy required to melt the fuse element. The Littelfuse value is slightly lower, indicating marginally faster thermal response. Both values are appropriate for 2.5 A fast-blow cartridge fuses and do not affect interchangeability in standard applications.

Q: Do all three parts require the same holder assembly?

A: Yes. All three parts use the 2AG package format (5mm x 15mm) and require a compatible 2AG holder. Physical dimensions are equivalent, ensuring mechanical compatibility.