Littelfuse 0332004.MXP Ceramic Fuse Cartridge - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0332004.MXP is a 4 A, 250 V AC / 125 V DC ceramic fuse cartridge designed for fast-blow response applications. This component is classified as obsolete, which necessitates identification of active equivalent alternatives that maintain identical electrical and mechanical specifications. The 3AB/3AG form factor (0.250" Dia × 1.250" L) requires a compatible holder for installation. Substitute parts must preserve the core electrical ratings and physical dimensions to ensure direct functional replacement.

Substiute Parts

0332004.MXP

Littelfuse Inc.In Stock: 7600332004.MXP Datasheet

Current PartRFQ

0314004.MXP

Littelfuse Inc.In Stock: 21450314004.MXP Datasheet

MFR RecommendedRFQ

0314004.HXP

LittelfuseIn Stock: 11330314004.HXP Datasheet

Parametric EquivalentRFQ

0314004.VXP

Littelfuse Inc.In Stock: 13640314004.VXP Datasheet

Parametric EquivalentRFQ

0332004.HXP

Littelfuse Inc.In Stock: 7580332004.HXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

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

• Current Rating: 4 A (exact match required)
• Voltage Rating - AC: 250 V (exact match required)
• Voltage Rating - DC: 125 V (exact match required)
• Fuse Type: Cartridge, Ceramic (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 3AB, 3AG, 1/4" × 1-1/4" (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

The substitute parts identified below meet all these criteria. Differences in breaking capacity, melting I²t, DC cold resistance, and approval agencies do not disqualify substitution when the primary electrical and mechanical parameters are identical.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the obsolete 0332004.MXP, the following active alternatives are available:

Primary Recommendation: 0314004.MXP

The 0314004.MXP is the manufacturer-recommended substitute. It maintains all core electrical and mechanical specifications while offering enhanced breaking capacity (750A AC, 10kA DC versus 100A) and broader regulatory approvals (CSA, K-MARK, UL in addition to CE and PSE). This part is actively manufactured and stocked, ensuring long-term availability.

Secondary Alternatives: 0314004.HXP and 0314004.VXP

Both 0314004.HXP and 0314004.VXP are parametric equivalents with identical electrical ratings and physical dimensions. They provide the same performance enhancements as 0314004.MXP. Selection between these three active 314-series parts may be based on packaging format (Bulk) and regional regulatory requirements. The 0314004.VXP includes KC approval, suitable for Korean market applications.

Obsolete Alternative: 0332004.HXP

The 0332004.HXP is a variant within the same obsolete 332 series. While electrically and mechanically equivalent to the main part, it shares the obsolete product status and does not provide a path to active component sourcing.

For new designs or long-term production continuity, transition to an active 314-series part (0314004.MXP, 0314004.HXP, or 0314004.VXP) is recommended.

Frequently Asked Questions (FAQ)

Q: Can 0314004.MXP be used as a direct replacement for 0332004.MXP?

A: Yes. Both parts are 4 A, 250 V AC / 125 V DC ceramic fuse cartridges with identical fast-blow response and 3AB/3AG form factor. The 0314004.MXP is the active equivalent and is suitable for direct substitution in existing applications.

Q: What is the difference between the 332 and 314 series?

A: The primary difference is product status: 332-series parts are obsolete, while 314-series parts are actively manufactured. Electrically and mechanically, they are equivalent. The 314-series offers higher breaking capacity and expanded regulatory approvals.

Q: Are there differences in breaking capacity between substitute parts?

A: Yes. The 0332004.MXP and 0332004.HXP have a breaking capacity of 100A, while the 314-series parts (0314004.MXP, 0314004.HXP, 0314004.VXP) have 750A AC and 10kA DC breaking capacity. This difference does not affect substitution eligibility for applications requiring 4 A protection at 250 V AC / 125 V DC.

Q: Do all substitute parts fit the same holder?

A: Yes. All parts listed maintain the 3AB/3AG form factor with dimensions of 0.250" Dia × 1.250" L (6.35mm × 31.75mm). They are mechanically interchangeable in any holder designed for this package type.

Q: Which substitute part should I select for new designs?

A: For new designs, select from the active 314-series alternatives: 0314004.MXP (manufacturer-recommended), 0314004.HXP, or 0314004.VXP. These parts ensure long-term availability and support. Selection among the three may depend on packaging requirements and regional regulatory certifications needed for your application.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All parts listed, including the main part and all substitutes, are ROHS3 compliant.