MDL-2-1/2-R Equivalent & Substitute Parts

Part Overview

The MDL-2-1/2-R is a 2.5 A, 250 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 currently active in production and carries multiple international approvals including CE, CSA, and UL certification.

Equivalent and substitute parts are identified when alternative fuses meet the same electrical specifications, mechanical dimensions, and holder compatibility requirements. Substitute parts enable procurement flexibility, support supply chain continuity, and provide options across different manufacturers while maintaining circuit protection performance.

Substiute Parts

MDL-2-1/2-R

Eaton - Electronics DivisionIn Stock: 1045MDL-2-1/2-R Datasheet

Current PartRFQ

BK/MDL-2-1/2-R

Eaton - Electronics DivisionIn Stock: 833BK/MDL-2-1/2-R Datasheet

DirectRFQ

BK/MDQ-2-1/2

Eaton - Electronics DivisionIn Stock: 1064BK/MDQ-2-1/2 Datasheet

Parametric EquivalentRFQ

MDQ-2-1/2

Eaton - Electronics DivisionIn Stock: 749MDQ-2-1/2 Datasheet

Parametric EquivalentRFQ

0034.3421

SCHURTER Inc.In Stock: 10550034.3421 Datasheet

Parametric EquivalentRFQ

031302.5HXP

Littelfuse Inc.In Stock: 1258031302.5HXP Datasheet

Parametric EquivalentRFQ

031302.5MXP

Littelfuse Inc.In Stock: 9261031302.5MXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MDL-2-1/2-R is determined by strict equivalence across the following parameters:

Critical Substitution Parameters:

• Current Rating: 2.5 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)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Mounting Type: Requires Holder (exact match required)
• Size / Dimension: 0.250" Dia x 1.250" L (exact match required)

All substitute parts listed meet these critical parameters. Secondary parameters such as breaking capacity, melting I²t, DC cold resistance, and approval agencies are provided for engineering evaluation but do not disqualify substitution when primary parameters align.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Eaton - Electronics Division):

BK/MDL-2-1/2-R is a direct manufacturer equivalent with identical electrical and mechanical specifications to the MDL-2-1/2-R. Both parts carry CE, CSA, and UL approvals and feature 100 A breaking capacity. The BK/MDL-2-1/2-R is suitable for direct replacement in all applications where MDL-2-1/2-R is specified.

BK/MDQ-2-1/2 and MDQ-2-1/2 are parametric equivalents from Eaton's MDQ series. Both maintain the 2.5 A, 250 V, slow-blow characteristics and 3AB/3AG holder compatibility. The MDQ-2-1/2 carries a lower breaking capacity of 35 A compared to the main part's 100 A. Both MDQ variants are active products with CSA and UL approvals.

Secondary Substitutes (Multi-Manufacturer):

031302.5HXP and 031302.5MXP are Littelfuse Inc. Series 313 fuses meeting all critical substitution parameters. Both parts are active products with extended approval coverage including CE, CSA, K-MARK, PSE, and UL certifications. DC cold resistance values (0.0811 Ohms) align closely with the main part specification. Both fuses support operating temperatures from -55°C to 125°C.

0034.3421 is a SCHURTER Inc. FST 6.3x32 series fuse meeting all critical electrical and mechanical parameters. This part carries Obsolete product status and CSA approval only. The 35 A breaking capacity is lower than the main part. This fuse is suitable for applications where SCHURTER compatibility is required and lower breaking capacity is acceptable.

Compliance Considerations:

All substitute parts are RoHS3 compliant or RoHS compliant. The Littelfuse parts (031302.5HXP and 031302.5MXP) and BK/MDL-2-1/2-R carry REACH Unaffected status. Selection should account for specific regulatory requirements in the target application region.

Frequently Asked Questions (FAQ)

Q: Can MDL-2-1/2-R be replaced with BK/MDL-2-1/2-R?

A: Yes. BK/MDL-2-1/2-R is a direct manufacturer equivalent with identical current rating (2.5 A), voltage rating (250 V), response time (slow blow), package dimensions (3AB, 3AG, 1/4" x 1-1/4"), and approval certifications (CE, CSA, UL). Both parts feature 100 A breaking capacity and 0.081 Ohms DC cold resistance.

Q: What is the difference between MDQ-2-1/2 and MDL-2-1/2-R?

A: Both parts share identical current rating (2.5 A), voltage rating (250 V), response time (slow blow), and mechanical dimensions (0.250" Dia x 1.250" L). The primary difference is breaking capacity: MDL-2-1/2-R provides 100 A breaking capacity while MDQ-2-1/2 provides 35 A. MDL-2-1/2-R carries CE approval; MDQ-2-1/2 does not. Both require 3AB or 3AG fuse holders.

Q: Are Littelfuse 031302.5HXP and 031302.5MXP interchangeable with MDL-2-1/2-R?

A: Yes. Both Littelfuse parts meet all critical substitution parameters: 2.5 A current rating, 250 V AC voltage rating, slow-blow response, 3AB/3AG holder compatibility, and 0.250" x 1.250" dimensions. Both are active products with comprehensive approval coverage (CE, CSA, K-MARK, PSE, UL) and support extended operating temperature range (-55°C to 125°C).

Q: Can MDL-2-1/2-R be used in any 3AB or 3AG fuse holder?

A: Yes. The MDL-2-1/2-R is designed for use in 3AB and 3AG fuse holders. The 1/4" x 1-1/4" (6.35mm x 31.75mm) dimensions are standard for these holder types. All listed substitute parts maintain identical dimensional specifications and holder compatibility.

Q: What is the significance of breaking capacity differences between substitute parts?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt at rated voltage. MDL-2-1/2-R and its direct equivalents (BK/MDL-2-1/2-R, 031302.5HXP, 031302.5MXP) provide 100 A breaking capacity. MDQ-2-1/2 and 0034.3421 provide 35 A breaking capacity. Selection should match the circuit's maximum available fault current.

Q: Is 0034.3421 suitable for new designs?

A: 0034.3421 carries Obsolete product status. While it meets all critical electrical and mechanical substitution parameters, it is not recommended for new designs. Active alternatives include BK/MDL-2-1/2-R, MDQ-2-1/2, 031302.5HXP, and 031302.5MXP.

Q: What approval certifications should I verify for my application?

A: MDL-2-1/2-R carries CE, CSA, and UL approvals. Substitute parts carry varying approval combinations. Littelfuse parts (031302.5HXP, 031302.5MXP) provide the broadest approval coverage including CE, CSA, K-MARK, PSE, and UL. Verify that selected substitute parts carry all certifications required by your application's regulatory jurisdiction.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are either RoHS3 compliant or RoHS compliant. BK/MDL-2-1/2-R, 0034.3421, 031302.5HXP, and 031302.5MXP are RoHS3 compliant. MDL-2-1/2-R and MDQ series parts are RoHS compliant. Verify specific RoHS compliance requirements for your application.