Littelfuse 0314004.MXP Ceramic Fuse 4A 250VAC 125VDC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0314004.MXP is a 4 A ceramic cartridge fuse rated for 250 V AC and 125 V DC operation. This fast-blow fuse is designed for use in 3AB, 3AG holder configurations with dimensions of 1/4" x 1-1/4" (6.35mm x 31.75mm). The part maintains active product status with 2064 units in current inventory. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical form factors, and approval certifications to ensure direct interchangeability in circuit protection applications.

Substiute Parts

0314004.MXP

Littelfuse Inc.In Stock: 21450314004.MXP Datasheet

Current PartRFQ

0314004.HXP

LittelfuseIn Stock: 11330314004.HXP Datasheet

DirectRFQ

0314004.VXP

Littelfuse Inc.In Stock: 13640314004.VXP Datasheet

Parametric EquivalentRFQ

3AB 4-R

Bel Fuse Inc.In Stock: 11153AB 4-R Datasheet

MFR RecommendedRFQ

BK/ABC-4-R

Eaton - Electronics DivisionIn Stock: 5076BK/ABC-4-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

• Current Rating: 4 A (exact match required)
• Voltage Rating - AC: 250 V (exact match required)
• Voltage Rating - DC: 125 V (exact match required for dual-voltage applications)
• Fuse Type: Cartridge, Ceramic (form factor requirement)
• Response Time: Fast Blow (performance characteristic)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (mechanical compatibility with holder)
• Mounting Type: Requires Holder (installation method)

All identified substitute parts meet these core electrical and mechanical parameters. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agency certifications are secondary characteristics that do not prevent substitution but may influence selection based on application-specific requirements.

Parameter Comparison

Engineering Selection Recommendations

All five parts listed maintain active product status and ROHS3 compliance, confirming their suitability for current applications. Selection among these substitutes should be based on the following factors:

Littelfuse Parts (0314004.MXP, 0314004.HXP, 0314004.VXP): These three Littelfuse ceramic fuses are electrically and mechanically identical, differing only in packaging designation and approval agency certifications. The 0314004.MXP includes CE, CSA, K-MARK, PSE, and UL approvals. The 0314004.HXP includes CE, CSA, K-MARK, PSE, and UL approvals. The 0314004.VXP includes CE, KC, PSE, and UL approvals. All three deliver 750A AC and 10kA DC breaking capacity with 10.4 melting I²t.

Bel Fuse 3AB 4-R: This part meets the core electrical and mechanical requirements but does not specify a DC voltage rating. Breaking capacity is limited to 200A AC. Melting I²t is 36, which is higher than the Littelfuse equivalents. Approval certifications include CE, CSA, cURus, and PSE.

Eaton BK/ABC-4-R: This part provides full dual-voltage operation (250V AC, 125V DC) with 200A AC and 10kA DC breaking capacity. Melting I²t is 22.28. Approval certifications are limited to CSA and UL. This part offers the highest inventory availability at 5025 units.

For applications requiring maximum breaking capacity and comprehensive approval coverage, the Littelfuse variants are preferred. For applications with less stringent breaking capacity requirements and where CSA/UL certification is sufficient, the Eaton BK/ABC-4-R provides a viable alternative with superior inventory availability.

Frequently Asked Questions (FAQ)

Q: Can 0314004.HXP and 0314004.VXP be used interchangeably with 0314004.MXP?

A: Yes. All three Littelfuse parts share identical electrical ratings (4A, 250V AC, 125V DC), fuse type (ceramic cartridge), response time (fast blow), and mechanical dimensions (3AB, 3AG, 1/4" x 1-1/4"). Differences in approval agency certifications do not affect electrical or mechanical interchangeability.

Q: What is the difference between the Littelfuse and Bel Fuse 3AB 4-R options?

A: The primary difference is breaking capacity. Littelfuse parts deliver 750A AC and 10kA DC breaking capacity, while the Bel Fuse 3AB 4-R is rated for 200A AC only. The Bel Fuse part also does not specify a DC voltage rating. Both are mechanically compatible with 3AB, 3AG holders and deliver the same 4A current rating at 250V AC.

Q: Is the Eaton BK/ABC-4-R suitable for dual-voltage (AC/DC) applications?

A: Yes. The Eaton BK/ABC-4-R is rated for both 250V AC and 125V DC operation, matching the dual-voltage capability of the Littelfuse 0314004.MXP. Breaking capacity is 200A AC and 10kA DC.

Q: Do all substitute parts fit the same 3AB, 3AG holder?

A: Yes. All five parts are designed for 3AB, 3AG holder configurations. Mechanical dimensions are 0.250" diameter with lengths of 1.250" to 1.252", ensuring compatibility with standard 3AB and 3AG fuse holders.

Q: Which part should I select for maximum circuit protection performance?

A: The Littelfuse variants (0314004.MXP, 0314004.HXP, 0314004.VXP) provide the highest breaking capacity at 750A AC and 10kA DC, along with the lowest melting I²t at 10.4. These characteristics deliver faster fault response and superior protection in high-fault-current environments.

Q: Are all parts RoHS compliant?

A: Yes. All five substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.