BP/MDL-3 Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The BP/MDL-3 is a 3 A, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Eaton - Bussmann Electrical Division. This fuse is designed for use in 3AB and 3AG holders with dimensions of 1/4" x 1-1/4" (6.35mm x 31.75mm). The part maintains active product status and is RoHS compliant. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical form factors, and approval certifications to ensure direct interchangeability in circuit protection applications.

Substiute Parts

BP/MDL-3

Eaton - Bussmann Electrical DivisionIn Stock: 1181BP/MDL-3 Datasheet

Current PartRFQ

0313003.HXIDP

Littelfuse Inc.In Stock: 11360313003.HXIDP Datasheet

Parametric EquivalentRFQ

0313003.HXP

LittelfuseIn Stock: 35270313003.HXP Datasheet

Parametric EquivalentRFQ

0313003.MXP

Littelfuse Inc.In Stock: 24850313003.MXP Datasheet

Parametric EquivalentRFQ

0313003.VXP

LittelfuseIn Stock: 8590313003.VXP Datasheet

Parametric EquivalentRFQ

BK/MDL-3-R

Eaton - Electronics DivisionIn Stock: 1928BK/MDL-3-R Datasheet

Parametric EquivalentRFQ

BK/MDQ-3

Eaton - Electronics DivisionIn Stock: 1040BK/MDQ-3 Datasheet

Parametric EquivalentRFQ

MDL-3-R

Eaton - Electronics DivisionIn Stock: 940MDL-3-R Datasheet

Parametric EquivalentRFQ

MDQ-3

Eaton - Electronics DivisionIn Stock: 818MDQ-3 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BP/MDL-3 is determined by the following critical parameters:

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

All substitute parts listed below meet these core electrical and mechanical parameters, ensuring direct compatibility with existing holder assemblies and circuit designs. Variations in breaking capacity, melting I²t, DC cold resistance, and approval certifications are noted but do not prevent substitution when the above parameters align.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain identical electrical ratings (3 A, 250 V AC) and mechanical form factors (3AB, 3AG, 1/4" x 1-1/4") as the BP/MDL-3, ensuring direct interchangeability in circuit protection applications.

For applications requiring RoHS compliance, the following parts are suitable: 0313003.HXIDP, 0313003.HXP, 0313003.MXP, 0313003.VXP, BK/MDL-3-R, and MDL-3-R. The Littelfuse 313 series parts (0313003.HXIDP, 0313003.HXP, 0313003.MXP, 0313003.VXP) provide expanded approval certifications including CE, K-MARK, and PSE, supporting broader international regulatory requirements.

For applications limited to CSA and UL certifications, BK/MDQ-3 and MDQ-3 remain valid substitutes. BK/MDQ-3 offers ROHS3 compliance, while MDQ-3 maintains the original certification profile.

Breaking capacity differences (35A for BP/MDL-3 and MDQ-3 versus 100A for other substitutes) reflect design variations but do not affect substitution eligibility when electrical and mechanical parameters match.

Frequently Asked Questions (FAQ)

Q: Can I substitute the BP/MDL-3 with any of the listed parts?

A: Yes. All listed parts meet the critical substitution parameters: 3 A current rating, 250 V AC voltage rating, slow-blow response, glass cartridge type, and 3AB/3AG holder compatibility with 1/4" x 1-1/4" dimensions. Physical installation and electrical performance remain unchanged.

Q: What is the difference between the Littelfuse 313 series and Eaton MDL/MDQ series?

A: Both series meet the core electrical and mechanical requirements. Littelfuse 313 series parts offer expanded international certifications (CE, K-MARK, PSE). Eaton MDL series parts are available in both RoHS compliant and non-compliant versions. Selection depends on regulatory and compliance requirements for your application.

Q: Does breaking capacity affect substitution?

A: Breaking capacity variations (35A versus 100A) do not prevent substitution when all electrical ratings and mechanical form factors match. Breaking capacity is a secondary parameter that reflects design robustness but does not impact compatibility with standard 3AB/3AG holder assemblies.

Q: Are there RoHS compliance considerations?

A: Yes. If RoHS compliance is required, select from: 0313003.HXIDP, 0313003.HXP, 0313003.MXP, 0313003.VXP (ROHS3 compliant), BK/MDL-3-R (ROHS3 compliant), or MDL-3-R (RoHS compliant). BK/MDQ-3 is RoHS non-compliant and MDQ-3 compliance status is not specified.

Q: Can I use these parts interchangeably in existing designs?

A: Yes. All substitute parts are mechanically and electrically interchangeable with the BP/MDL-3 in applications using 3AB or 3AG holders. No circuit modifications or holder changes are required.

Q: What certifications should I verify for my application?

A: The BP/MDL-3 carries CSA and UL certifications. Substitute parts maintain these certifications with additional regional approvals available through Littelfuse 313 series options (CE, K-MARK, PSE). Verify that selected substitute certifications align with your application's regulatory requirements.