Littelfuse 0326.031H Ceramic Fuse Cartridge – Equivalent & Substitute Parts

Part Overview

The Littelfuse 0326.031H is a 31 mA, 250 V AC/DC ceramic fuse cartridge designed for 3AB and 3AG holder applications. This component features slow-blow response characteristics and is housed in a 1/4" x 1-1/4" (6.35mm x 31.75mm) form factor. The 0326.031H carries an obsolete product status, making identification of active equivalent parts essential for ongoing system support and component procurement.

Substiute Parts

0326.031H

LittelfuseIn Stock: 8610326.031H Datasheet

Current PartRFQ

0326.031HXP

Littelfuse Inc.In Stock: 8220326.031HXP Datasheet

DirectRFQ

0326.031MXP

Littelfuse Inc.In Stock: 6710326.031MXP Datasheet

Parametric EquivalentRFQ

0326.031VXP

LittelfuseIn Stock: 10920326.031VXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 0326.031H is determined by strict electrical and mechanical parameter matching:

Critical Substitution Parameters:

• Current Rating: 31 mA (exact match required)
• Voltage Rating (AC): 250 V (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)
• Breaking Capacity @ Rated Voltage: 100 A (exact match required)
• Melting I²t: 0.011 (exact match required)

All three substitute parts—0326.031HXP, 0326.031MXP, and 0326.031VXP—meet these critical parameters identically. The primary distinction between the main part and substitutes is product status (obsolete vs. active) and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts—0326.031HXP, 0326.031MXP, and 0326.031VXP—are electrically and mechanically equivalent to the 0326.031H and provide direct replacement capability. The substitutes offer the following advantages over the obsolete main part:

• Active product status ensures ongoing availability and supply chain continuity
• ROHS3 compliance and CE certification meet current regulatory requirements
• Documented operating temperature range (-55°C ~ 125°C) and REACH compliance provide enhanced environmental and safety documentation
• DC cold resistance variance (332.5 Ohms vs. 330 Ohms) remains within acceptable tolerance for this component class

Selection among the three active substitutes may be based on packaging preference (all listed as Bulk) and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the 0326.031HXP, 0326.031MXP, or 0326.031VXP be used as direct replacements for the 0326.031H?

A: Yes. All three parts are parametrically equivalent across all critical electrical and mechanical specifications: 31 mA current rating, 250 V AC voltage rating, ceramic cartridge fuse type, slow-blow response, 3AB/3AG holder compatibility, 100 A breaking capacity, and 0.011 melting I²t. Physical dimensions and holder requirements are identical.

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

A: The 0326.031HXP, 0326.031MXP, and 0326.031VXP are electrically and mechanically identical. Differences are limited to packaging designation and inventory levels. All three carry active product status, ROHS3 compliance, CE certification, and REACH Unaffected status.

Q: Why does the 0326.031H show obsolete status?

A: The 0326.031H is classified as obsolete, indicating it is no longer in active production. The three substitute parts represent the current active alternatives within the Littelfuse 326 series that maintain identical electrical and mechanical specifications.

Q: Is the DC cold resistance difference (330 Ohms vs. 332.5 Ohms) significant?

A: No. The 2.5 Ohm variance between the main part and substitutes falls within normal manufacturing tolerance for ceramic fuse cartridges and does not affect functional performance or circuit protection characteristics.

Q: Are all substitute parts compatible with 3AB and 3AG holders?

A: Yes. All parts, including the main 0326.031H and the three substitutes, are designed for 3AB and 3AG holder applications with identical 1/4" x 1-1/4" (6.35mm x 31.75mm) form factor.

Q: What compliance certifications do the substitute parts carry?

A: The 0326.031HXP, 0326.031MXP, and 0326.031VXP all carry CE certification, ROHS3 compliance, and REACH Unaffected status. The obsolete 0326.031H carries no documented approval agency or compliance certifications.