Littelfuse 03136.25MXP Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 03136.25MXP is a 6.25 A, 250 V AC/DC slow-blow glass cartridge fuse in the 313 series, designed for 3AB and 3AG holder applications. This component provides circuit protection in industrial and commercial equipment requiring reliable overcurrent protection with delayed response characteristics. The part maintains active product status with full compliance to international safety standards including CE, CSA, K-MARK, PSE, and UL certifications. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity.

Substiute Parts

03136.25MXP

Littelfuse Inc.In Stock: 97803136.25MXP Datasheet

Current PartRFQ

03136.25HXP

Littelfuse Inc.In Stock: 139803136.25HXP Datasheet

DirectRFQ

03136.25HXIDP

Littelfuse Inc.In Stock: 101703136.25HXIDP Datasheet

Parametric EquivalentRFQ

BK/MDL-6-1/4-R

Eaton - Electronics DivisionIn Stock: 1084BK/MDL-6-1/4-R Datasheet

MFR RecommendedRFQ

BK/MDQ-6-1/4

Eaton - Electronics DivisionIn Stock: 935BK/MDQ-6-1/4 Datasheet

MFR RecommendedRFQ

MDL-6-1/4-R

Eaton - Electronics DivisionIn Stock: 791MDL-6-1/4-R Datasheet

MFR RecommendedRFQ

MDQ-6-1/4

Eaton - Electronics DivisionIn Stock: 790MDQ-6-1/4 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 03136.25MXP is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Current Rating: 6.25 A
• Voltage Rating (AC): 250 V
• Fuse Type: Cartridge, Glass
• Response Time: Slow Blow
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (6.35mm x 31.75mm)
• Breaking Capacity @ Rated Voltage: 200 A
• Mounting Type: Requires Holder

Acceptable Variation Parameters:

• DC Cold Resistance: Minor variations permitted within normal manufacturing tolerances
• Melting I²t: Variations acceptable provided breaking capacity remains at 200 A
• Approval Agency certifications: Subset of original certifications acceptable for specific regional applications

Substitute parts are grouped into two categories:

Direct Littelfuse Equivalents: Parts 03136.25HXP and 03136.25HXIDP maintain identical electrical and mechanical specifications with the main part, differing only in packaging or internal construction variants within the same manufacturer's product line.

Cross-Manufacturer Equivalents: Eaton Electronics Division parts (BK/MDL-6-1/4-R, BK/MDQ-6-1/4, MDL-6-1/4-R, MDQ-6-1/4) meet all mandatory electrical and mechanical parameters, enabling direct functional replacement in 3AB/3AG holder applications.

Parameter Comparison

Engineering Selection Recommendations

Littelfuse Direct Equivalents (03136.25HXP, 03136.25HXIDP): These parts are recommended as primary substitutes for the 03136.25MXP. Both maintain identical electrical specifications, mechanical dimensions, and full compliance certifications (CE, CSA, K-MARK, PSE, UL). Selection between these variants depends on specific packaging or internal construction requirements within the Littelfuse 313 series product line.

Eaton MDL Series (BK/MDL-6-1/4-R, MDL-6-1/4-R): These cross-manufacturer equivalents meet all mandatory electrical and mechanical parameters with 200 A breaking capacity. Both variants maintain RoHS compliance and CE/CSA/UL certifications. The MDL-6-1/4-R (non-black variant) is preferred for applications requiring full RoHS compliance documentation.

Eaton MDQ Series (BK/MDQ-6-1/4, MDQ-6-1/4): These parts satisfy all critical electrical and mechanical requirements for 3AB/3AG holder compatibility. The MDQ-6-1/4 variant is RoHS compliant and suitable for applications with environmental compliance requirements. The BK/MDQ-6-1/4 variant carries RoHS non-compliance status and should be selected only when legacy equipment specifications explicitly permit non-compliant components.

Regional Certification Considerations: For applications requiring K-MARK or PSE certifications, Littelfuse equivalents (03136.25HXP, 03136.25HXIDP) are the appropriate selection. Eaton MDL and MDQ variants lack these certifications and are suitable only for markets where CE, CSA, and UL certifications satisfy regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can I substitute an Eaton MDL or MDQ fuse for the Littelfuse 03136.25MXP in any application?

A: Substitution is valid only when the application requirements are limited to CE, CSA, and UL certifications. If your equipment design or regional market requires K-MARK or PSE certifications, Littelfuse equivalents (03136.25HXP or 03136.25HXIDP) must be used. All substitute parts maintain identical 6.25 A current rating, 250 V voltage rating, and 3AB/3AG holder compatibility.

Q: What is the difference between 03136.25HXP and 03136.25HXIDP?

A: Both parts are Littelfuse direct equivalents with identical electrical and mechanical specifications. The difference lies in internal construction or packaging variants within the 313 series product line. Both maintain the same 6.25 A rating, 250 V voltage, slow-blow response, and full certification compliance. Selection depends on specific internal construction requirements for your application.

Q: Are there RoHS compliance differences between substitute options?

A: Yes. The Littelfuse parts (03136.25MXP, 03136.25HXP, 03136.25HXIDP) and Eaton MDL-6-1/4-R and MDQ-6-1/4 are RoHS compliant. The Eaton BK/MDL-6-1/4-R and BK/MDQ-6-1/4 variants have different RoHS statuses (ROHS3 Compliant and RoHS non-compliant, respectively). For applications requiring RoHS compliance documentation, select from the compliant variants.

Q: Will the DC Cold Resistance variation between Littelfuse and Eaton parts affect circuit performance?

A: The DC Cold Resistance values (0.0154 Ohms for Littelfuse, 0.02 Ohms for Eaton MDL, 0.0169 Ohms for Eaton MDQ) represent minor manufacturing variations within acceptable tolerances for slow-blow cartridge fuses. All parts maintain identical 200 A breaking capacity and 6.25 A current rating, ensuring equivalent circuit protection performance in 3AB/3AG holder applications.

Q: Can I use MDQ-6-1/4 if my equipment originally specified 03136.25MXP?

A: Direct substitution is mechanically and electrically valid for 3AB/3AG holder applications. However, verify that your equipment design or regional certification requirements do not mandate K-MARK or PSE certifications, which the MDQ-6-1/4 does not carry. If your application is limited to CE, CSA, and UL requirements, the MDQ-6-1/4 is a suitable substitute.

Q: What should I consider when choosing between Littelfuse and Eaton substitutes?

A: Primary selection criteria are regional certification requirements and RoHS compliance status. For applications requiring K-MARK or PSE certifications, use Littelfuse equivalents. For applications limited to CE, CSA, and UL certifications, Eaton MDL and MDQ variants are valid. All substitute parts maintain identical 6.25 A current rating, 250 V voltage rating, slow-blow response, and 3AB/3AG holder compatibility.