Littelfuse 032503.2H Ceramic Fuse 3.2A 250VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 032503.2H is a 3.2 A, 250 V AC/DC ceramic cartridge fuse with slow-blow response characteristics, designed for through-hole mounting in 3AB and 3AG package formats. This fuse is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. Active alternatives from the same manufacturer series provide enhanced compliance and extended operating temperature ranges while maintaining identical electrical and mechanical specifications.

Substiute Parts

032503.2H

Littelfuse Inc.In Stock: 781032503.2H Datasheet

Current PartRFQ

032503.2HXP

Littelfuse Inc.In Stock: 1093032503.2HXP Datasheet

DirectRFQ

032503.2MXP

Littelfuse Inc.In Stock: 833032503.2MXP Datasheet

Parametric EquivalentRFQ

032503.2VXP

Littelfuse Inc.In Stock: 1098032503.2VXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 032503.2H are qualified based on strict electrical and mechanical parameter equivalence within the Littelfuse 325 series. All substitute parts maintain identical current rating (3.2 A), voltage rating (250 V AC), fuse type (ceramic cartridge), response time (slow blow), package format (3AB, 3AG), breaking capacity (100 A), melting I²t value (214), physical dimensions (0.275" Dia x 1.288" L), and mounting type (through hole).

The three active substitute parts—032503.2HXP, 032503.2MXP, and 032503.2VXP—differ from the obsolete main part only in packaging configuration (bulk vs. standard) and compliance certifications. DC cold resistance values are functionally equivalent (0.0539 Ohms vs. 0.0535 Ohms), representing normal manufacturing tolerance variation within ceramic fuse specifications.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts (032503.2HXP, 032503.2MXP, 032503.2VXP) are direct functional equivalents for the obsolete 032503.2H. Selection among these active alternatives should be based on:

Product Status & Availability: All substitute parts carry active product status with confirmed inventory levels (032503.2HXP: 1008 pcs, 032503.2MXP: 821 pcs, 032503.2VXP: 1064 pcs), ensuring long-term supply continuity compared to the obsolete main part.

Compliance & Certifications: All substitutes achieve ROHS3 compliance and REACH unaffected status, addressing modern regulatory requirements. The substitute parts expand certification coverage to include CE, K-MARK, PSE, and UL approvals. 032503.2VXP includes KC certification in addition to the standard set.

Operating Temperature Range: All substitute parts specify -55°C ~ 125°C operating temperature, providing defined thermal performance parameters absent from the obsolete main part specification.

Electrical Equivalence: DC cold resistance values (0.0539 Ohms) across all substitutes fall within normal manufacturing tolerance of the main part (0.0535 Ohms), maintaining circuit performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can 032503.2HXP, 032503.2MXP, and 032503.2VXP be used interchangeably with 032503.2H?

A: Yes. All three parts are parametrically equivalent with identical current rating (3.2 A), voltage rating (250 V AC), fuse type (ceramic cartridge), response time (slow blow), package format (3AB, 3AG), breaking capacity (100 A), melting I²t (214), physical dimensions (0.275" Dia x 1.288" L), and mounting type (through hole). The differences are packaging configuration and compliance certifications.

Q: What is the difference between the three substitute parts?

A: 032503.2HXP, 032503.2MXP, and 032503.2VXP are electrically and mechanically identical. All are supplied in bulk packaging and carry active product status. Differences exist only in regulatory certifications: 032503.2HXP and 032503.2MXP include K-MARK certification, while 032503.2VXP includes KC certification. Selection depends on target market regulatory requirements.

Q: Why is the main part 032503.2H classified as obsolete?

A: The 032503.2H is obsolete due to its RoHS non-compliant status and limited certification scope. Modern applications require ROHS3 compliance and expanded regulatory certifications (CE, K-MARK, PSE, KC). The active substitute parts address these requirements while maintaining full electrical and mechanical equivalence.

Q: Are there any compatibility concerns when replacing 032503.2H with substitute parts?

A: No compatibility concerns exist. The substitute parts maintain identical physical dimensions (0.275" Dia x 1.288" L), package format (3AB, 3AG), and mounting type (through hole), ensuring direct mechanical fit in existing through-hole fuse holders. Electrical performance is preserved through equivalent current rating, voltage rating, response time, and breaking capacity specifications.

Q: What is the significance of the DC cold resistance difference (0.0535 Ohms vs. 0.0539 Ohms)?

A: The 0.0004 Ohm difference represents normal manufacturing tolerance variation within ceramic fuse specifications and has no functional impact on circuit performance. Both values fall within acceptable tolerance ranges for this fuse category.

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

A: For new designs, any of the three substitute parts (032503.2HXP, 032503.2MXP, 032503.2VXP) is suitable. Selection should be based on target market certifications: use 032503.2HXP or 032503.2MXP for markets requiring K-MARK certification, or 032503.2VXP for markets requiring KC certification. All three carry CE, CSA, PSE, and UL approvals.