Equivalent & Substitute Parts for MDL-1/32-R Glass Cartridge Fuse

Part Overview

The MDL-1/32-R is a 32 mA, 250 V AC/DC glass cartridge fuse manufactured by Eaton Electronics 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 product is currently classified as obsolete, necessitating identification of active equivalent and substitute components for continued system support and procurement.

Substiute Parts

MDL-1/32-R

Eaton - Electronics DivisionIn Stock: 728MDL-1/32-R Datasheet

Current PartRFQ

BK/MDL-1/32

Eaton - Electronics DivisionIn Stock: 882BK/MDL-1/32 Datasheet

Parametric EquivalentRFQ

0313.031HXP

Littelfuse Inc.In Stock: 11870313.031HXP Datasheet

DirectRFQ

0313.031MXP

Littelfuse Inc.In Stock: 8310313.031MXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MDL-1/32-R is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

• Current Rating: 32 mA nominal (31-32 mA range acceptable within fuse tolerance standards)
• Voltage Rating: 250 V AC minimum
• Fuse Type: Cartridge, Glass construction
• Response Time: Slow Blow characteristic
• Package / Case: 3AB, 3AG form factor
• Physical Dimensions: 0.250" Dia x 1.250" L (6.35mm x 31.75mm)
• Mounting: Requires compatible holder

Substitute Parts Identified:

1. BK/MDL-1/32 (Eaton Electronics Division) - Parametric equivalent with identical electrical and mechanical specifications. Active product status. Packaging differs (Bulk vs. standard).

2. 0313.031HXP (Littelfuse Inc., Series 313) - Direct manufacturer alternative with 31 mA current rating, meeting tolerance requirements for 32 mA applications. Active product with enhanced certifications and compliance documentation.

3. 0313.031MXP (Littelfuse Inc., Series 313) - Direct manufacturer alternative with 31 mA current rating, meeting tolerance requirements for 32 mA applications. Active product with enhanced certifications and compliance documentation.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: 0313.031HXP or 0313.031MXP (Littelfuse Inc.)

The Littelfuse 313 series fuses (0313.031HXP and 0313.031MXP) are the preferred substitutes for the obsolete MDL-1/32-R. Both parts meet all critical electrical and mechanical parameters with the following advantages:

• Active product status ensures long-term availability and supply chain continuity
• ROHS3 compliance exceeds the RoHS compliance of the original part
• Comprehensive approval certifications (CE, CSA, UL) provide regulatory documentation
• Specified operating temperature range (-55°C ~ 125°C) and breaking capacity (35A) offer enhanced technical documentation
• 31 mA current rating operates within standard fuse tolerance for 32 mA applications

Secondary Recommendation: BK/MDL-1/32 (Eaton Electronics Division)

The BK/MDL-1/32 provides an exact electrical and mechanical equivalent with identical 32 mA current rating. This option is suitable for applications requiring strict current matching. However, RoHS non-compliance status and lack of specified certifications may present regulatory or procurement constraints in certain applications.

Frequently Asked Questions (FAQ)

Q: Can the 31 mA Littelfuse fuses substitute for the 32 mA MDL-1/32-R?

A: Yes. The 31 mA rating of the Littelfuse 313 series (0313.031HXP and 0313.031MXP) operates within standard fuse tolerance specifications for 32 mA applications. Both parts share identical voltage ratings, fuse type, response time, and physical dimensions required for direct substitution in 3AB and 3AG holders.

Q: What is the difference between 0313.031HXP and 0313.031MXP?

A: Both parts are Littelfuse 313 series glass cartridge fuses with identical electrical specifications (31 mA, 250 V AC/DC, Slow Blow). The designations HXP and MXP represent different product variants within the same series. Both are active products with equivalent performance characteristics and certifications.

Q: Is the BK/MDL-1/32 a better choice than the Littelfuse alternatives?

A: The BK/MDL-1/32 provides exact current rating matching (32 mA) and maintains the Eaton manufacturer lineage. However, the Littelfuse alternatives offer superior compliance status (ROHS3 vs. RoHS non-compliant for BK/MDL-1/32) and comprehensive regulatory certifications (CE, CSA, UL). Selection depends on specific application requirements regarding compliance and certification documentation.

Q: Will these substitute fuses fit in existing 3AB and 3AG holders?

A: Yes. All substitute parts maintain the identical 3AB, 3AG form factor and physical dimensions (0.250" Dia x 1.250" L / 6.35mm x 31.75mm). Direct mechanical compatibility with existing holders is confirmed.

Q: Are there any temperature or environmental limitations with the substitute parts?

A: The Littelfuse 313 series fuses (0313.031HXP and 0313.031MXP) are specified for operating temperatures from -55°C to 125°C. The original MDL-1/32-R and BK/MDL-1/32 do not have published temperature specifications. Applications requiring operation outside the -55°C to 125°C range should reference detailed technical documentation for the specific substitute part selected.