MDL-1/4-R Glass Cartridge Fuse 250mA 250VAC Equivalent & Substitute Parts

Part Overview

The MDL-1/4-R is a 250 mA, 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 RoHS compliant. Equivalent and substitute parts are necessary when the primary part is unavailable, when alternative compliance certifications are required, or when design specifications allow for parametric alternatives that meet the same electrical and mechanical requirements.

Substiute Parts

MDL-1/4-R

Eaton - Electronics DivisionIn Stock: 900MDL-1/4-R Datasheet

Current PartRFQ

BK/MDL-1/4-R

Eaton - Electronics DivisionIn Stock: 1629BK/MDL-1/4-R Datasheet

DirectRFQ

BK/MDQ-1/4

Eaton - Electronics DivisionIn Stock: 1068BK/MDQ-1/4 Datasheet

Parametric EquivalentRFQ

MDQ-1/4

Eaton - Electronics DivisionIn Stock: 1149MDQ-1/4 Datasheet

Parametric EquivalentRFQ

0034.3411

SCHURTER Inc.In Stock: 9940034.3411 Datasheet

Parametric EquivalentRFQ

0313.250HXP

Littelfuse Inc.In Stock: 8940313.250HXP Datasheet

Parametric EquivalentRFQ

0313.250MXP

Littelfuse Inc.In Stock: 16490313.250MXP Datasheet

Parametric EquivalentRFQ

0313.250VXP

Littelfuse Inc.In Stock: 11710313.250VXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MDL-1/4-R are classified based on strict electrical and mechanical parameter matching. All substitute parts listed maintain the following critical parameters:

• Current Rating: 250 mA
• Voltage Rating (AC): 250 V
• Fuse Type: Cartridge, Glass
• Response Time: Slow Blow
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4"
• Mounting Type: Requires Holder
• Breaking Capacity @ Rated Voltage: 35A
• Size / Dimension: 0.250" Dia x 1.250" L (6.35mm x 31.75mm)

Substitution is permitted when all electrical and mechanical parameters are identical. Variations in DC cold resistance, melting I²t, approval agencies, and RoHS compliance status do not prevent substitution provided the core electrical and mechanical specifications remain unchanged.

Parameter Comparison

Engineering Selection Recommendations

Direct Manufacturer Equivalent: BK/MDL-1/4-R is the direct equivalent from Eaton - Electronics Division. This part maintains identical electrical and mechanical specifications to the MDL-1/4-R and carries the same approval certifications (CE, CSA, UL). Selection of BK/MDL-1/4-R is appropriate when maintaining the same manufacturer is preferred.

Parametric Equivalents from Eaton: BK/MDQ-1/4 and MDQ-1/4 are parametric equivalents from Eaton - Electronics Division. Both parts meet all electrical and mechanical requirements. These parts carry CSA and UL certifications but do not include CE certification. Selection is appropriate when CSA and UL compliance is sufficient for the application.

Parametric Equivalents from Littelfuse: 0313.250HXP, 0313.250MXP, and 0313.250VXP are parametric equivalents from Littelfuse Inc. All three parts meet all electrical and mechanical requirements and carry CE, CSA, and UL certifications. These parts are active in production and suitable for direct substitution.

Parametric Equivalent from SCHURTER: 0034.3411 is a parametric equivalent from SCHURTER Inc. This part meets all electrical and mechanical requirements but carries only CE certification. The product status is listed as obsolete, indicating limited availability. Selection should be limited to applications where existing inventory is available and future procurement is not required.

Frequently Asked Questions (FAQ)

Q: Can BK/MDL-1/4-R be used as a direct replacement for MDL-1/4-R? A: Yes. BK/MDL-1/4-R is a direct manufacturer equivalent with identical electrical specifications (250 mA, 250 V AC), fuse type (cartridge, glass), response time (slow blow), package designation (3AB, 3AG, 1/4" x 1-1/4"), and approval certifications (CE, CSA, UL).

Q: What is the difference between the Eaton MDL and MDQ series fuses? A: Both series meet the same electrical and mechanical parameters for this 250 mA, 250 V application. The MDQ series carries CSA and UL certifications but does not include CE certification. The MDL series carries CE, CSA, and UL certifications. Selection depends on required compliance certifications for the application.

Q: Are Littelfuse 0313 series fuses compatible with 3AB and 3AG holders? A: Yes. The 0313.250HXP, 0313.250MXP, and 0313.250VXP all conform to the 3AB, 3AG package designation with dimensions of 1/4" x 1-1/4" (6.35mm x 31.75mm) and are compatible with standard 3AB and 3AG fuse holders.

Q: Why is the SCHURTER 0034.3411 listed as obsolete? A: The 0034.3411 is marked as obsolete in the manufacturer's product status. While it meets all electrical and mechanical parameters, this designation indicates the part is no longer in active production. Use of this part should be limited to applications where existing inventory is available.

Q: Do all substitute parts have the same approval certifications? A: No. The MDL-1/4-R, BK/MDL-1/4-R, and Littelfuse parts (0313.250HXP, 0313.250MXP, 0313.250VXP) carry CE, CSA, and UL certifications. The Eaton MDQ series (BK/MDQ-1/4, MDQ-1/4) carries CSA and UL certifications only. The SCHURTER 0034.3411 carries CE certification only. Selection should be based on required compliance certifications for the specific application.

Q: Can I substitute a fuse with different DC cold resistance? A: DC cold resistance varies among the substitute parts (ranging from 3.208 to 5.775 Ohms) but does not affect the substitution criteria. All parts meet the same electrical and mechanical requirements for the 250 mA, 250 V application. DC cold resistance is a secondary parameter that does not prevent substitution when all primary electrical and mechanical specifications are identical.

Q: What is the difference between the Littelfuse 0313.250HXP, 0313.250MXP, and 0313.250VXP? A: All three Littelfuse parts meet identical electrical and mechanical specifications for this application. The designations (HXP, MXP, VXP) represent different product variants within the 313 series, but all three are parametric equivalents with the same current rating (250 mA), voltage rating (250 V), response time (slow blow), package (3AB, 3AG, 1/4" x 1-1/4"), and certifications (CE, CSA, UL).