Littelfuse 03266.25VXP Ceramic Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 03266.25VXP is a 6.25 A, 250 V AC/DC ceramic cartridge fuse with slow-blow response characteristics. This fuse is designed for applications requiring holder-based mounting in 3AB and 3AG standard packages. The part maintains active product status and is ROHS3 compliant with full international approval certifications. Substitute parts are identified when equivalent electrical and mechanical parameters are required for component procurement, inventory management, or supply chain continuity.

Substiute Parts

03266.25VXP

Littelfuse Inc.In Stock: 74903266.25VXP Datasheet

Current PartRFQ

03266.25MXP

Littelfuse Inc.In Stock: 114403266.25MXP Datasheet

Parametric EquivalentRFQ

BK/MDA-6-1/4-R

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 03266.25VXP are identified based on strict equivalence across the following critical parameters:

• Current Rating: 6.25 A (exact match required)
• Voltage Rating: 250 V AC (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)
• Mounting Type: Requires Holder (exact match required)

Two substitute parts meet these criteria: the Littelfuse 03266.25MXP (parametric equivalent from the same manufacturer) and the Eaton BK/MDA-6-1/4-R (manufacturer-recommended equivalent from an alternative supplier).

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 03266.25MXP provides direct parametric equivalence to the 03266.25VXP within the same manufacturer's product line. Both parts carry identical electrical specifications, approval certifications (CE, CSA, PSE, UL), and operating temperature ranges. Selection between these two Littelfuse variants is based on inventory availability and procurement lead times.

The Eaton BK/MDA-6-1/4-R is a manufacturer-recommended alternative that maintains electrical equivalence across current rating, voltage, fuse type, response time, and package specifications. The Eaton part exhibits lower DC cold resistance (0.031 Ohms versus 0.0346 Ohms) and reduced melting I²t (37.2 versus 60.4), which may affect thermal response characteristics in specific circuit applications. Operating temperature range is not specified for the Eaton part. Both Littelfuse options are preferred when full specification alignment is required.

Frequently Asked Questions (FAQ)

Q: Can the Eaton BK/MDA-6-1/4-R be used as a direct replacement for the Littelfuse 03266.25VXP?

A: The Eaton part meets the core electrical and mechanical compatibility requirements: 6.25 A current rating, 250 V AC voltage rating, ceramic cartridge fuse type, slow-blow response, and 3AB/3AG package format. However, the Eaton part has different melting I²t (37.2 versus 60.4) and DC cold resistance (0.031 versus 0.0346 Ohms), which may produce different thermal response behavior in the circuit. Application-specific thermal analysis is necessary to confirm suitability.

Q: What is the difference between the Littelfuse 03266.25VXP and 03266.25MXP?

A: Both parts are Littelfuse ceramic cartridge fuses with identical electrical ratings, response characteristics, and package specifications. The primary difference is internal construction or manufacturing process, reflected in the part number suffix (VXP versus MXP). Both maintain the same approval certifications and operating temperature range.

Q: Are all three parts interchangeable in the same holder?

A: Yes. All three parts conform to the 3AB and 3AG package standards with identical physical dimensions (0.250" Dia x 1.250" L). Mechanical compatibility with standard fuse holders is confirmed for all three parts.

Q: What certifications apply to these substitute parts?

A: The Littelfuse 03266.25VXP and 03266.25MXP carry CE, CSA, PSE, and UL approvals. The Eaton BK/MDA-6-1/4-R approval certifications are not specified in the provided data.

Q: How do melting I²t values affect fuse selection?

A: Melting I²t is a thermal energy parameter that determines the fuse's response to overcurrent conditions. The Littelfuse parts (60.4) have higher melting I²t than the Eaton part (37.2), indicating different thermal response profiles. Circuit design and protection requirements must be evaluated to ensure the selected fuse provides appropriate protection without nuisance tripping.