MDA-6-1/4-R Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The MDA-6-1/4-R is a 6.25 A, 250 V AC/DC ceramic cartridge fuse manufactured by Eaton - Electronics Division. This slow-blow fuse is designed for applications requiring circuit protection in industrial and commercial equipment. The part operates within the 3AB and 3AG holder standards with dimensions of 0.250" diameter by 1.250" length (6.35mm x 31.75mm). The product maintains Active status and is RoHS3 compliant. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity when the primary part number becomes unavailable or when alternative sourcing is required.

Substiute Parts

MDA-6-1/4-R

Eaton - Electronics DivisionIn Stock: 901MDA-6-1/4-R Datasheet

Current PartRFQ

BK/MDA-6-1/4-R

Eaton - Electronics DivisionIn Stock: 1106BK/MDA-6-1/4-R Datasheet

Parametric EquivalentRFQ

03266.25MXP

Littelfuse Inc.In Stock: 114403266.25MXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MDA-6-1/4-R is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Current Rating: 6.25 A
• Voltage Rating (AC): 250 V
• Fuse Type: Cartridge, Ceramic
• 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)
• Mounting Type: Requires Holder

All identified substitute parts meet these mandatory parameters without exception. Variations in secondary parameters such as melting I²t, DC cold resistance, breaking capacity, and approval agencies do not disqualify substitution when primary electrical and mechanical specifications align.

Parameter Comparison

Engineering Selection Recommendations

MDA-6-1/4-R (Primary Part - Eaton): This part carries Active product status with CE, CSA, and UL approvals. It is the original specification and should be selected when available and when the application requires the specific approval certifications listed.

BK/MDA-6-1/4-R (Parametric Equivalent - Eaton): This Eaton variant is electrically and mechanically equivalent to the MDA-6-1/4-R. Both parts are manufactured by Eaton - Electronics Division and share identical electrical ratings and package specifications. The BK/MDA-6-1/4-R carries Active product status and RoHS3 compliance. This part may be selected when the primary MDA-6-1/4-R is unavailable. Note that approval agency documentation differs between the two Eaton variants.

03266.25MXP (Direct Manufacturer Equivalent - Littelfuse): This Littelfuse part meets all mandatory electrical and mechanical parameters for substitution. It carries Active product status, RoHS3 compliance, and broader approval agency coverage (CE, CSA, PSE, UL). The 03266.25MXP includes a specified breaking capacity of 400A at rated voltage and an extended operating temperature range of -55°C to 125°C. This part is suitable for applications where Littelfuse sourcing is acceptable and where the additional performance specifications provide value.

Frequently Asked Questions (FAQ)

Q: Can BK/MDA-6-1/4-R be used as a direct replacement for MDA-6-1/4-R?

A: Yes. Both parts are manufactured by Eaton - Electronics Division and share identical current rating (6.25 A), voltage rating (250 V AC), fuse type (Cartridge, Ceramic), response time (Slow Blow), and package specifications (3AB, 3AG, 1/4" x 1-1/4"). Both are RoHS3 compliant and Active products. The parts are mechanically and electrically interchangeable.

Q: What are the differences between the Eaton MDA-6-1/4-R and the Littelfuse 03266.25MXP?

A: The primary differences are manufacturer identity and secondary performance parameters. Both parts meet identical electrical ratings (6.25 A, 250 V AC) and mechanical specifications (3AB, 3AG package, 0.250" x 1.250" dimensions). The Littelfuse part specifies a breaking capacity of 400A, an operating temperature range of -55°C to 125°C, and includes PSE approval in addition to CE, CSA, and UL certifications. The Eaton part does not specify these parameters in the provided data.

Q: Are there compatibility concerns when substituting between manufacturers?

A: No compatibility concerns exist for the identified substitutes. All three parts conform to the same holder standards (3AB, 3AG), have identical physical dimensions, and meet the same electrical specifications. The fuse holder interface is standardized across manufacturers for this package type.

Q: Which part should be selected for applications requiring specific regulatory approvals?

A: The MDA-6-1/4-R carries CE, CSA, and UL approvals. The 03266.25MXP carries CE, CSA, PSE, and UL approvals. The BK/MDA-6-1/4-R does not list specific approval agencies in the provided data. Selection should be based on the regulatory requirements of the target application and geographic market.

Q: What is the significance of the melting I²t and DC cold resistance variations?

A: Melting I²t and DC cold resistance are secondary thermal and electrical characteristics that vary between the three parts but do not affect substitution eligibility. These parameters are provided for detailed thermal analysis and circuit design optimization. The MDA-6-1/4-R specifies melting I²t of 90 and DC cold resistance of 0.017 Ohms, while the BK/MDA-6-1/4-R specifies 37.2 and 0.031 Ohms respectively, and the 03266.25MXP specifies 60.4 and 0.0346 Ohms. All values remain within acceptable ranges for the 6.25 A, 250 V ceramic fuse category.

Q: Can these fuses be used in DC applications?

A: The specifications indicate these are 250 V AC/DC fuses. The voltage rating applies to both AC and DC circuits. However, detailed application requirements should be confirmed with circuit design specifications.