BK/MDL-25-R Equivalent & Substitute Parts

Part Overview

The BK/MDL-25-R is a 25 A, 32 V AC/DC slow-blow glass cartridge fuse manufactured by Eaton - Electronics Division. This fuse is designed for use in 3AB and 3AG fuse holders with dimensions of 1/4" x 1-1/4" (6.35mm x 31.75mm). The part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing system support and maintenance applications.

Substiute Parts

BK/MDL-25-R

Eaton - Electronics DivisionIn Stock: 1158BK/MDL-25-R Datasheet

Current PartRFQ

BK/MDL-25

Eaton - Electronics DivisionIn Stock: 1104BK/MDL-25 Datasheet

Parametric EquivalentRFQ

MDL-25

Eaton - Electronics DivisionIn Stock: 862MDL-25 Datasheet

Parametric EquivalentRFQ

0313025.HXP

Littelfuse Inc.In Stock: 11680313025.HXP Datasheet

SimilarRFQ

0313025.MXP

Littelfuse Inc.In Stock: 18890313025.MXP Datasheet

Parametric EquivalentRFQ

0313025.VXP

Littelfuse Inc.In Stock: 7950313025.VXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BK/MDL-25-R is determined by strict equivalence across the following critical parameters:

• Current Rating: 25 A
• Voltage Rating (AC): 32 V
• Fuse Type: Cartridge, Glass
• Response Time: Slow Blow
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4"
• Mounting Type: Requires Holder
• Size / Dimension: 0.250" Dia x 1.250" L (6.35mm x 31.75mm)

All substitute parts listed maintain these core electrical and mechanical parameters. Variations in breaking capacity, melting I²t, DC cold resistance, and compliance certifications are secondary characteristics that do not preclude functional substitution within the specified electrical and mechanical constraints.

Parameter Comparison

Engineering Selection Recommendations

Eaton - Electronics Division Substitutes (Preferred for Direct Replacement)

BK/MDL-25 and MDL-25 are active Eaton products that maintain identical electrical and mechanical specifications to the obsolete BK/MDL-25-R. Both parts are manufactured by the original equipment supplier and carry CSA and UL approvals. BK/MDL-25 is available in bulk packaging with 1044 units in stock, while MDL-25 is available with 807 units in stock. These parts provide direct functional equivalence with established supply chain continuity.

Littelfuse Inc. Substitutes (Cross-Manufacturer Alternatives)

The 0313025.HXP, 0313025.MXP, and 0313025.VXP series from Littelfuse Inc. are active products that satisfy all core electrical and mechanical requirements. These parts maintain the 25 A current rating, 32 V AC voltage rating, slow-blow response characteristic, and 3AB/3AG package compatibility. Littelfuse parts carry UL approval and are RoHS3 compliant. The 0313025.MXP variant has the highest inventory availability at 1826 units in stock.

Compliance Considerations

The original BK/MDL-25-R carries CE, CSA, and UL approvals. Eaton substitutes (BK/MDL-25, MDL-25) carry CSA and UL approvals. Littelfuse substitutes carry UL approval. System designers must confirm that the specific approval requirements of the target application are satisfied by the selected substitute part.

Frequently Asked Questions (FAQ)

Q: Can BK/MDL-25 or MDL-25 be used as direct replacements for BK/MDL-25-R?

A: Yes. BK/MDL-25 and MDL-25 are functionally equivalent to BK/MDL-25-R across all critical electrical and mechanical parameters: 25 A current rating, 32 V AC voltage rating, slow-blow response, 3AB/3AG package compatibility, and 1/4" x 1-1/4" dimensions. Both are active products manufactured by Eaton - Electronics Division.

Q: What is the difference between Eaton and Littelfuse substitute options?

A: Eaton substitutes (BK/MDL-25, MDL-25) are manufactured by the original equipment supplier and maintain identical breaking capacity (1 kA) and melting I²t (15221) specifications. Littelfuse substitutes (0313025.HXP, 0313025.MXP, 0313025.VXP) have a lower breaking capacity (300 A) and higher melting I²t (16500). Both manufacturers' products satisfy the core electrical and mechanical requirements and carry appropriate UL certifications.

Q: Are the Littelfuse 0313025 series parts compatible with 3AB and 3AG fuse holders?

A: Yes. The 0313025.HXP, 0313025.MXP, and 0313025.VXP parts are specified for 3AB and 3AG fuse holders with identical 1/4" x 1-1/4" dimensions (6.35mm x 31.75mm). They are mechanically and electrically compatible with the same holder types as the BK/MDL-25-R.

Q: What is the difference between 0313025.HXP, 0313025.MXP, and 0313025.VXP?

A: All three Littelfuse parts maintain identical electrical specifications: 25 A current rating, 32 V AC voltage rating, slow-blow response, 300 A breaking capacity, and 16500 melting I²t. They differ in packaging designation and internal construction characteristics. All three are active products with UL approval and RoHS3 compliance.

Q: Which substitute part has the best inventory availability?

A: The Littelfuse 0313025.MXP has the highest inventory availability at 1826 units in stock. The Eaton BK/MDL-25 has 1044 units in stock, and the Littelfuse 0313025.HXP has 1110 units in stock.

Q: Does the difference in breaking capacity between Eaton (1 kA) and Littelfuse (300 A) affect substitution?

A: Breaking capacity is a secondary characteristic that does not preclude functional substitution within the specified electrical and mechanical constraints. The 25 A current rating and 32 V AC voltage rating remain constant across all substitute parts. System designers must confirm that the breaking capacity of the selected substitute meets the specific requirements of the target application.

Q: Are all substitute parts RoHS compliant?

A: The Littelfuse 0313025 series (HXP, MXP, VXP) are RoHS3 compliant. The Eaton BK/MDL-25-R is RoHS compliant. The Eaton BK/MDL-25 and MDL-25 are RoHS non-compliant. System designers must confirm RoHS compliance requirements for the target application.