Equivalent & Substitute Parts for BK/MDQ-1-1/2 Glass Cartridge Fuse

Part Overview

The BK/MDQ-1-1/2 is a 1.5 A, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Eaton - Electronics Division. This component is classified as Active product status and requires a 3AB or 3AG fuse holder for installation. The fuse cartridge measures 0.250" diameter by 1.250" length (6.35mm x 31.75mm) and is approved by CSA and UL agencies.

Substitute parts are necessary when the primary part becomes unavailable, when alternative compliance certifications are required, or when design specifications allow for functionally equivalent alternatives from different manufacturers while maintaining electrical and mechanical compatibility.

Substiute Parts

BK/MDQ-1-1/2

Eaton - Electronics DivisionIn Stock: 762BK/MDQ-1-1/2 Datasheet

Current PartRFQ

BK/MDL-1-1/2-R

Eaton - Electronics DivisionIn Stock: 1927BK/MDL-1-1/2-R Datasheet

Parametric EquivalentRFQ

0034.5228

SCHURTER Inc.In Stock: 9500034.5228 Datasheet

Parametric EquivalentRFQ

031301.5HXP

Littelfuse Inc.In Stock: 1038031301.5HXP Datasheet

Parametric EquivalentRFQ

031301.5VXP

Littelfuse Inc.In Stock: 1150031301.5VXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BK/MDQ-1-1/2 is determined by strict equivalence across the following parameters:

Critical Parameters (Must Match Exactly):

• Current Rating: 1.5 A
• Voltage Rating - AC: 250 V
• Fuse Type: Cartridge, Glass
• Response Time: Slow Blow
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4"
• Size / Dimension: 0.250" Dia x 1.250" L (6.35mm x 31.75mm)
• Breaking Capacity @ Rated Voltage: 100A

All four substitute parts listed below meet these critical parameters and are therefore electrically and mechanically interchangeable with the BK/MDQ-1-1/2 in applications requiring a 1.5 A, 250 V AC/DC slow-blow glass cartridge fuse in standard 3AB/3AG holder format.

Parameter Comparison

Engineering Selection Recommendations

BK/MDL-1-1/2-R (Eaton - Electronics Division): This substitute is the preferred alternative when RoHS3 compliance is required. It maintains Eaton manufacturer continuity, carries Active product status, and is approved by CE, CSA, and UL agencies. DC cold resistance is lower at 0.156 Ohms compared to the primary part's 0.27 Ohms. Inventory availability is high at 1903 pieces.

031301.5HXP (Littelfuse Inc.): This substitute is suitable for applications requiring RoHS3 compliance and extended operating temperature range (-55°C to 125°C). It carries Active product status with CE, CSA, PSE, and UL approvals. DC cold resistance is 0.191 Ohms. Inventory availability is 991 pieces.

031301.5VXP (Littelfuse Inc.): This substitute is functionally identical to 031301.5HXP with the same electrical characteristics, RoHS3 compliance, and approval certifications. DC cold resistance is 0.191 Ohms. Inventory availability is 1088 pieces.

0034.5228 (SCHURTER Inc.): This substitute carries Obsolete product status and ROHS3 compliance. It is approved by CSA and UL agencies. This part should be selected only when legacy system compatibility or specific design requirements mandate SCHURTER components. Inventory availability is 842 pieces.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts directly in place of the BK/MDQ-1-1/2?

A: Yes. All four substitute parts are electrically and mechanically equivalent. They share identical current rating (1.5 A), voltage rating (250 V AC), response time (Slow Blow), package format (3AB, 3AG), and physical dimensions (0.250" Dia x 1.250" L). They install in the same 3AB or 3AG fuse holder without modification.

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

A: Both series are 1.5 A, 250 V AC/DC slow-blow glass cartridge fuses with identical electrical and mechanical specifications. The primary difference is that BK/MDL-1-1/2-R is RoHS3 compliant, while BK/MDQ-1-1/2 is RoHS non-compliant. The MDL series also has lower DC cold resistance (0.156 Ohms vs. 0.27 Ohms).

Q: Why is 0034.5228 marked as Obsolete?

A: Product status reflects manufacturer lifecycle designation. The SCHURTER 0034.5228 remains functionally equivalent and is available in inventory. Obsolete status indicates the manufacturer is not actively producing new units. Selection should consider long-term supply chain requirements.

Q: What does RoHS3 compliance mean for fuse selection?

A: RoHS3 compliance indicates the component meets Restriction of Hazardous Substances Directive requirements. If your application or end-market requires RoHS3 certification, select BK/MDL-1-1/2-R, 031301.5HXP, 031301.5VXP, or 0034.5228. The original BK/MDQ-1-1/2 is RoHS non-compliant.

Q: Are there differences in melting I²t values between substitutes?

A: Yes. Melting I²t values vary: BK/MDL-1-1/2-R (22.7), 0034.5228 (25), and both Littelfuse parts (38). These values indicate thermal response characteristics. All parts maintain the same 1.5 A current rating and Slow Blow response classification, ensuring functional equivalence in standard circuit protection applications.

Q: Which substitute has the best inventory availability?

A: BK/MDL-1-1/2-R has the highest inventory at 1903 pieces. 031301.5VXP has 1088 pieces, 0034.5228 has 842 pieces, and 031301.5HXP has 991 pieces.

Q: Can I mix different substitute parts in the same equipment?

A: Yes. All substitute parts are electrically and mechanically interchangeable. However, for consistency in maintenance records and spare parts management, it is standard practice to use the same part number throughout a system or equipment batch.