Equivalent & Substitute Parts for BK/MDA-1-1/2

Part Overview

The BK/MDA-1-1/2 is a 1.5 A, 250 V AC ceramic cartridge fuse manufactured by Eaton - Electronics Division. This component is classified as obsolete, requiring identification of active equivalent alternatives for continued circuit protection applications. The fuse operates as a slow-blow device in 3AB and 3AG holder configurations with physical dimensions of 0.250" diameter by 1.250" length (6.35mm x 31.75mm). Locating functionally equivalent substitutes is necessary to maintain supply chain continuity and ensure compliance with current regulatory standards.

Substiute Parts

BK/MDA-1-1/2

Eaton - Electronics DivisionIn Stock: 945BK/MDA-1-1/2 Datasheet

Current PartRFQ

BK/MDA-1-1/2-R

Eaton - Electronics DivisionIn Stock: 1954BK/MDA-1-1/2-R Datasheet

DirectRFQ

MDA-1-1/2-R

Eaton - Electronics DivisionIn Stock: 1143MDA-1-1/2-R Datasheet

DirectRFQ

032601.5HXP

Littelfuse Inc.In Stock: 1079032601.5HXP Datasheet

DirectRFQ

032601.5MXP

Littelfuse Inc.In Stock: 1549032601.5MXP Datasheet

DirectRFQ

032601.5VXP

LittelfuseIn Stock: 767032601.5VXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters:

Primary Matching Criteria:

• Current Rating: 1.5 A (exact match required)
• Voltage Rating - AC: 250 V (exact match required)
• Fuse Type: Cartridge, Ceramic (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Size / Dimension: 0.250" Dia x 1.250" L (exact match required)
• Mounting Type: Requires Holder (exact match required)

All identified substitute parts meet these primary criteria. Secondary parameters including breaking capacity, melting I²t, DC cold resistance, and regulatory compliance certifications are provided for engineering evaluation but do not disqualify substitution based on the primary matching criteria.

Parameter Comparison

Engineering Selection Recommendations

Eaton MDA Series (BK/MDA-1-1/2-R and MDA-1-1/2-R):

The BK/MDA-1-1/2-R and MDA-1-1/2-R represent direct manufacturer equivalents from Eaton - Electronics Division. Both parts are active products with ROHS3 compliance and expanded regulatory certifications (CE, CSA, UL). These options maintain the original manufacturer lineage and are recommended for applications requiring continuity with Eaton component specifications. The primary distinction between these two part numbers is packaging designation (BK prefix indicates bulk packaging). Both parts are in active production with substantial inventory availability (1927 and 1124 units respectively).

Littelfuse 326 Series (032601.5HXP, 032601.5MXP, 032601.5VXP):

The Littelfuse ceramic cartridge fuses (326 series) provide cross-manufacturer substitution with identical primary electrical and mechanical parameters. These parts feature expanded DC voltage rating (125 V DC) and enhanced breaking capacity for DC applications (10kA DC). All three Littelfuse variants are ROHS3 compliant with CE, CSA, PSE, and UL certifications. Operating temperature range is specified as -55°C to 125°C. The three part numbers represent different packaging or internal specifications within the same functional class, with inventory availability ranging from 699 to 1450 units.

Selection Basis:

• All substitute parts maintain exact equivalence across current rating, AC voltage, fuse type, response time, package configuration, and physical dimensions.
• All substitute parts are active products, addressing the obsolescence status of the original BK/MDA-1-1/2.
• All substitute parts achieve ROHS3 compliance, supporting modern regulatory requirements.
• Eaton options preserve original manufacturer continuity; Littelfuse options provide cross-manufacturer redundancy with enhanced DC specifications.

Frequently Asked Questions (FAQ)

Q: Can BK/MDA-1-1/2-R and MDA-1-1/2-R be used interchangeably with BK/MDA-1-1/2?

A: Yes. Both Eaton variants meet all primary substitution criteria: 1.5 A current rating, 250 V AC voltage rating, ceramic cartridge type, slow-blow response, 3AB/3AG package configuration, and 0.250" x 1.250" physical dimensions. The primary distinction is packaging format (BK prefix). Both are active products with current regulatory compliance.

Q: What is the difference between the three Littelfuse part numbers (032601.5HXP, 032601.5MXP, 032601.5VXP)?

A: All three Littelfuse parts are functionally equivalent across the primary substitution criteria. The part number suffixes (HXP, MXP, VXP) indicate different packaging or internal specifications within the 326 series. Selection among these variants should be based on specific packaging requirements and inventory availability for your application.

Q: Are the Littelfuse substitutes compatible with 3AB and 3AG holders?

A: Yes. The Littelfuse 326 series parts are specified for 3AB and 3AG holder configurations with identical physical dimensions (0.250" diameter x 1.250" length). Direct mechanical compatibility is confirmed.

Q: What is the significance of the DC voltage rating on Littelfuse parts?

A: The Littelfuse variants specify 125 V DC rating, whereas the original Eaton part does not specify a DC voltage rating. This additional specification indicates Littelfuse parts are rated for DC circuit applications up to 125 V. For AC-only applications, this parameter does not affect substitution eligibility. For applications requiring DC protection, Littelfuse parts provide explicit DC voltage specification.

Q: How do melting I²t values differ between parts, and does this affect substitution?

A: Melting I²t values vary across the product range (3.4 to 40.1). This parameter describes thermal energy absorption characteristics. All parts meet the primary substitution criteria based on current rating, voltage, type, and package. Melting I²t differences reflect manufacturing variations and do not disqualify substitution. Application-specific thermal requirements should be evaluated independently.

Q: Which substitute part should be selected for new designs?

A: For new designs, any of the active substitute parts (Eaton BK/MDA-1-1/2-R, MDA-1-1/2-R, or Littelfuse 032601.5HXP/MXP/VXP) are appropriate. Selection should consider: manufacturer preference, supply chain strategy, regulatory certification requirements, and DC voltage application needs. All parts are ROHS3 compliant and carry current regulatory approvals (CE, CSA, UL).

Q: Is the BK/MDA-1-1/2 still available for purchase?

A: The BK/MDA-1-1/2 is classified as obsolete. However, 869 units are reported in current inventory. For long-term supply assurance, transition to active substitute parts (BK/MDA-1-1/2-R, MDA-1-1/2-R, or Littelfuse variants) is recommended.