Equivalent & Substitute Parts for BK1/ABC-25-R Ceramic Cartridge Fuse

Part Overview

The BK1/ABC-25-R is a 25 A ceramic cartridge fuse rated for 250 V AC and 125 V DC operation, manufactured by Eaton Electronics Division. This component is classified as obsolete, requiring identification of active equivalent and substitute parts for continued system support and procurement.

Ceramic cartridge fuses in the 3AB/3AG form factor (0.250" diameter × 1.250" length) serve as critical overcurrent protection devices in industrial and commercial electrical systems. The fast-blow response characteristic provides protection for sensitive circuits and equipment.

Due to the obsolete status of BK1/ABC-25-R, equivalent parts from active product lines must be identified to ensure supply chain continuity and system reliability.

Substiute Parts

BK1/ABC-25-R

Eaton - Electronics DivisionIn Stock: 1013BK1/ABC-25-R Datasheet

Current PartRFQ

ABC-25-R

Eaton - Electronics DivisionIn Stock: 1092ABC-25-R Datasheet

Parametric EquivalentRFQ

BK/ABC-25-R

Eaton - Electronics DivisionIn Stock: 1448BK/ABC-25-R Datasheet

Parametric EquivalentRFQ

BK/ABC-25YX

Eaton - Electronics DivisionIn Stock: 785BK/ABC-25YX Datasheet

Parametric EquivalentRFQ

BK/GBB-25-R

Eaton - Electronics DivisionIn Stock: 893BK/GBB-25-R Datasheet

Parametric EquivalentRFQ

GBB-25-R

Eaton - Electronics DivisionIn Stock: 1000GBB-25-R Datasheet

Parametric EquivalentRFQ

0314025.MXP

Littelfuse Inc.In Stock: 21350314025.MXP Datasheet

DirectRFQ

0504025.MXP

Littelfuse Inc.In Stock: 8070504025.MXP Datasheet

DirectRFQ

0314025.HXP

Littelfuse Inc.In Stock: 14300314025.HXP Datasheet

Parametric EquivalentRFQ

0314025.MX52LP

LittelfuseIn Stock: 16400314025.MX52LP Datasheet

Parametric EquivalentRFQ

0314025.VXP

Littelfuse Inc.In Stock: 9590314025.VXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for ceramic cartridge fuses is determined by strict equivalence across electrical and mechanical parameters. The following criteria establish valid substitution relationships:

Primary Equivalence Criteria:

• Current Rating: 25 A (exact match required)
• Voltage Rating - AC: 250 V (exact match required)
• Voltage Rating - DC: 125 V (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Fuse Type: Cartridge, Ceramic (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Requires Holder (exact match required)

Secondary Compatibility Factors:

• Breaking Capacity: Minimum 200 A AC / 400 A DC
• Approval Agencies: CSA, UL, UR, CE, K-MARK, PSE certifications
• RoHS Compliance: ROHS3 Compliant preferred
• Operating Temperature Range: -55°C to 125°C (when specified)

Parts meeting all primary criteria are classified as parametric equivalents. Parts from different manufacturers meeting identical electrical and mechanical specifications are classified as direct equivalents.

Parameter Comparison

Engineering Selection Recommendations

Tier 1 - Direct Parametric Equivalents (Recommended Primary Substitutes):

ABC-25-R and BK/ABC-25-R from Eaton Electronics Division are direct parametric equivalents to the obsolete BK1/ABC-25-R. Both parts maintain identical electrical specifications (25 A, 250 V AC, 125 V DC), mechanical form factor (3AB/3AG, 0.250" × 1.250"), and response characteristics (Fast Blow). Both are active products with ROHS3 compliance and CSA/UL certifications. BK/ABC-25-R offers higher inventory availability (1352 pcs) compared to ABC-25-R (1027 pcs).

Tier 2 - Eaton Series Equivalents:

BK/GBB-25-R and GBB-25-R represent alternative Eaton series products meeting all primary electrical and mechanical criteria. Both maintain 25 A current rating, 250 V AC / 125 V DC voltage ratings, and 3AB/3AG form factor. GBB series parts carry CSA and UR certifications with ROHS3 compliance. These parts are suitable for applications where Eaton GBB series qualification is acceptable.

BK/ABC-25YX is an active Eaton product meeting all electrical and mechanical specifications but carries RoHS non-compliance status. Selection of this part requires confirmation that RoHS compliance is not mandated by system requirements or regulatory obligations.

Tier 3 - Littelfuse Cross-Manufacturer Equivalents:

0314025.MXP, 0314025.HXP, 0314025.MX52LP, and 0314025.VXP from Littelfuse Inc. are parametric equivalents meeting all primary electrical and mechanical criteria. All four parts maintain 25 A current rating, 250 V AC / 125 V DC voltage ratings, Fast Blow response, and 3AB/3AG form factor. All carry ROHS3 compliance and multiple international certifications (CE, K-MARK, PSE, UL). Operating temperature range is specified as -55°C to 125°C. Breaking capacity is rated at 100 A AC / 400 A DC, which meets the minimum 200 A AC / 400 A DC requirement for AC applications with reduced margin. 0314025.MX52LP specifies axial mounting orientation.

Tier 4 - Voltage-Elevated Substitute (Limited Compatibility):

0504025.MXP from Littelfuse Inc. is a voltage-elevated variant rated for 500 V AC / 420 V DC. This part maintains the 25 A current rating and 3AB/3AG form factor but exceeds the specified voltage ratings of the original part. This component is suitable only for applications where higher voltage ratings are required and system design permits voltage elevation. This part is not a direct substitute for 250 V AC / 125 V DC applications.

Compliance and Certification Considerations:

All Tier 1, 2, and 3 parts carry CSA, UL, or equivalent international certifications (UR, CE, K-MARK, PSE). Selection should prioritize parts matching the certification requirements of the original system design. Littelfuse parts offer broader international certification coverage (CE, K-MARK, PSE, UL) compared to Eaton parts (CSA, UL, UR).

Frequently Asked Questions (FAQ)

Q: Can BK/ABC-25-R be used as a direct replacement for the obsolete BK1/ABC-25-R?

A: Yes. BK/ABC-25-R is a parametric equivalent meeting all electrical specifications (25 A, 250 V AC, 125 V DC), mechanical form factor (3AB/3AG, 0.250" × 1.250"), and response characteristics (Fast Blow). Both parts require the same holder and carry identical certifications (CSA, UL). BK/ABC-25-R is an active product with higher inventory availability.

Q: What is the difference between ABC-25-R and BK/ABC-25-R?

A: Both parts are parametric equivalents from Eaton Electronics Division with identical electrical and mechanical specifications. The primary difference is packaging designation. ABC-25-R is listed with Bulk packaging, while BK/ABC-25-R carries the same designation. Both are active products suitable for direct substitution.

Q: Can Littelfuse 0314025.MXP be used instead of the Eaton part?

A: Yes, with one consideration. 0314025.MXP meets all primary electrical specifications (25 A, 250 V AC, 125 V DC), mechanical form factor (3AB/3AG), and response characteristics (Fast Blow). However, breaking capacity is rated at 100 A AC compared to the Eaton specification of 200 A AC. For applications with fault currents between 100 A and 200 A AC, the Littelfuse part provides reduced margin. For fault currents below 100 A AC, the part is fully compatible. Littelfuse parts carry broader international certifications (CE, K-MARK, PSE, UL).

Q: Is BK/ABC-25YX suitable as a substitute?

A: BK/ABC-25YX meets all electrical and mechanical specifications but is RoHS non-compliant. Selection of this part is appropriate only when RoHS compliance is not required by system specifications, procurement standards, or regulatory obligations. If RoHS compliance is mandatory, use ROHS3-compliant alternatives such as BK/ABC-25-R or Littelfuse equivalents.

Q: What is the difference between 0314025.MXP and 0314025.MX52LP?

A: Both parts are parametric equivalents from Littelfuse with identical electrical specifications and certifications. The primary difference is mounting orientation. 0314025.MX52LP specifies axial mounting configuration, while 0314025.MXP does not specify orientation. Selection depends on holder compatibility and installation requirements.

Q: Can 0504025.MXP be used in a 250 V AC / 125 V DC circuit?

A: 0504025.MXP is rated for 500 V AC / 420 V DC operation. While the part can physically operate in lower voltage circuits, it is not a direct substitute for 250 V AC / 125 V DC applications. The elevated voltage rating does not provide functional benefit in lower voltage systems and may introduce unnecessary cost. Use 0504025.MXP only when higher voltage ratings are required by system design.

Q: What certifications should I verify when selecting a substitute?

A: The original BK1/ABC-25-R carries CSA and UL certifications. Substitute parts should maintain equivalent or broader certification coverage. Eaton parts (ABC-25-R, BK/ABC-25-R, BK/GBB-25-R, GBB-25-R) carry CSA, UL, or UR certifications. Littelfuse parts carry CE, K-MARK, PSE, and UL certifications. Verify that selected substitute meets the certification requirements of your system design and regional regulatory obligations.

Q: Are there any operating temperature differences between substitute parts?

A: The original BK1/ABC-25-R does not specify operating temperature range. Littelfuse equivalents (0314025.MXP, 0314025.HXP, 0314025.MX52LP, 0314025.VXP) specify -55°C to 125°C operating range. Eaton parts do not specify operating temperature. For applications requiring extended temperature operation, Littelfuse parts provide documented temperature specifications.

Q: What is the significance of melting I²t values?

A: Melting I²t represents the thermal energy required to melt the fuse element. The original BK1/ABC-25-R specifies 839.3 I²t. Littelfuse equivalents specify 1450 I²t, indicating higher thermal capacity. This difference reflects design variations between manufacturers but does not affect substitution compatibility for standard 25 A fast-blow applications. Both values are within acceptable ranges for ceramic cartridge fuses in this current class.

Q: Can I mix different manufacturers in the same circuit?

A: Yes. All substitute parts meet identical electrical and mechanical specifications and carry appropriate certifications. Mixing Eaton and Littelfuse parts in the same circuit is permissible from an engineering standpoint. However, system design documentation and procurement standards may specify single-manufacturer sourcing. Verify internal standards before implementing multi-manufacturer solutions.