Equivalent & Substitute Parts for BK/C515-1.25-R

Part Overview

The BK/C515-1.25-R is a 1.25 A, 250 V AC glass cartridge fuse manufactured by Eaton - Electronics Division. This through-hole mounted fuse operates with slow-blow response characteristics and is housed in a 2AG package format (5mm x 15mm axial). The part maintains active product status with 1085 units in current inventory. Substitute parts are identified to address application requirements, regional compliance needs, or supply chain considerations while maintaining equivalent electrical and mechanical performance within specified parameters.

Substiute Parts

BK/C515-1.25-R

Eaton - Electronics DivisionIn Stock: 1108BK/C515-1.25-R Datasheet

Current PartRFQ

02301.25HXP

Littelfuse Inc.In Stock: 90102301.25HXP Datasheet

DirectRFQ

02301.25MXP

Littelfuse Inc.In Stock: 1994802301.25MXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BK/C515-1.25-R are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Current Rating: 1.25 A (exact match required)
• Voltage Rating - AC: 250 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Through Hole (exact match required)

Secondary Compatibility Factors:

• Voltage Rating - DC: Substitute parts rated for 125 V DC provide extended capability beyond the main part specification
• Package / Case: Substitute parts use non-standard cartridge format (4.50mm x 14.50mm) versus the main part's 2AG format (5mm x 15mm). Physical dimensions differ but both are through-hole axial configurations
• Breaking Capacity: Substitute parts rated at 35A AC and 10kA DC differ from the main part's 100A rating
• Melting I²t: Substitute parts rated at 9.8 differ from the main part's 22.961

The Littelfuse 230 series parts (02301.25HXP and 02301.25MXP) satisfy all primary matching criteria and are therefore classified as functional substitutes. Dimensional and performance parameter variations must be evaluated within specific application contexts.

Parameter Comparison

Engineering Selection Recommendations

BK/C515-1.25-R Selection Criteria: The Eaton BK/C515-1.25-R maintains active product status with CSA and UL approvals. This part is suitable for applications requiring the 2AG standard package format and 100A breaking capacity specification. RoHS compliance is confirmed.

02301.25HXP Selection Criteria: The Littelfuse 02301.25HXP is an active product with extended approval certifications (CE, CSA, PSE, UL) and ROHS3 compliance. This part provides DC voltage capability (125 V DC) and defined operating temperature range (-55°C ~ 125°C). The non-standard cartridge package (4.50mm x 14.50mm) differs from the 2AG format. Inventory availability is 850 units.

02301.25MXP Selection Criteria: The Littelfuse 02301.25MXP is an active product with identical electrical specifications and certifications to the 02301.25HXP. This part offers superior inventory availability (19895 units) and identical compliance profile. The non-standard cartridge package dimensions match the 02301.25HXP.

Selection between these parts depends on package format compatibility with existing mechanical designs and regional compliance requirements. All three parts satisfy the core electrical parameters of 1.25 A at 250 V AC with slow-blow response.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 230 series parts (02301.25HXP, 02301.25MXP) directly replace the Eaton BK/C515-1.25-R?

A: The Littelfuse parts match all primary electrical parameters (1.25 A, 250 V AC, slow-blow cartridge fuse, through-hole mounting). However, the package format differs: Littelfuse parts use a non-standard cartridge (4.50mm x 14.50mm) while the Eaton part uses the 2AG standard (5mm x 15mm). Physical compatibility with existing fuse holders must be verified before substitution.

Q: What is the significance of the different breaking capacity ratings?

A: The Eaton BK/C515-1.25-R has a breaking capacity of 100A at rated voltage. The Littelfuse substitutes have 35A AC and 10kA DC breaking capacity. Breaking capacity defines the maximum fault current the fuse can safely interrupt. Application circuit requirements determine whether the lower breaking capacity is acceptable.

Q: Why do the Littelfuse parts include a 125 V DC rating while the Eaton part does not specify DC voltage?

A: The Littelfuse 230 series parts are rated for both 250 V AC and 125 V DC operation, providing extended application flexibility. The Eaton part specification does not include a DC voltage rating. Applications requiring DC operation should use the Littelfuse substitutes.

Q: Are there compliance differences between the three parts?

A: The Eaton BK/C515-1.25-R carries CSA and UL approvals. The Littelfuse parts (02301.25HXP and 02301.25MXP) carry CE, CSA, PSE, and UL approvals, providing broader regional compliance coverage. Both Littelfuse parts are ROHS3 compliant; the Eaton part is RoHS compliant.

Q: What is the difference between 02301.25HXP and 02301.25MXP?

A: The 02301.25HXP and 02301.25MXP are electrically and mechanically identical. The primary difference is inventory availability: 02301.25HXP has 850 units in stock, while 02301.25MXP has 19895 units in stock. Both parts are active products with identical specifications and certifications.

Q: How do the melting I²t values affect substitution?

A: Melting I²t is a thermal characteristic that defines the fuse's response to overcurrent. The Eaton part has a melting I²t of 22.961, while the Littelfuse substitutes have 9.8. Lower I²t values indicate faster thermal response. Circuit protection coordination and equipment thermal withstand capability must be evaluated when substituting parts with different I²t ratings.

Q: What is the operating temperature range for the Eaton part?

A: The Eaton BK/C515-1.25-R specification does not include an operating temperature range. The Littelfuse substitutes are rated for -55°C ~ 125°C operation. Applications requiring defined temperature performance should reference the Littelfuse specifications.