Littelfuse 0318.375H Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0318.375H is a 375 mA, 250 V AC/DC fast-blow glass cartridge fuse in the 3AB/3AG package format (1/4" x 1-1/4" axial). This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. Direct replacements from the active product line maintain identical electrical and mechanical specifications while offering improved compliance status and extended operating temperature range.

Substiute Parts

0318.375H

Littelfuse Inc.In Stock: 9070318.375H Datasheet

Current PartRFQ

0318.375HXP

Littelfuse Inc.In Stock: 8860318.375HXP Datasheet

DirectRFQ

0318.375MXP

Littelfuse Inc.In Stock: 7610318.375MXP Datasheet

Parametric EquivalentRFQ

0318.375VXP

Littelfuse Inc.In Stock: 11380318.375VXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0318.375H is determined by strict equivalence across the following parameters:

• Current Rating: 375 mA (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (exact match required)
• Size / Dimension: 0.275" Dia x 1.288" L (6.99mm x 32.72mm) (exact match required)
• Breaking Capacity @ Rated Voltage: 35A (exact match required)
• Melting I²t: 0.185 (exact match required)
• DC Cold Resistance: 0.825 Ohms (exact match required)

All three substitute parts (0318.375HXP, 0318.375MXP, 0318.375VXP) meet these criteria and are classified as direct manufacturer equivalents from Littelfuse Inc.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts (0318.375HXP, 0318.375MXP, 0318.375VXP) are electrically and mechanically equivalent to the 0318.375H and are suitable for direct replacement in circuit designs. The substitute parts offer the following advantages over the obsolete main part:

• Active product status ensures ongoing availability and supply chain continuity
• ROHS3 compliance meets current environmental and regulatory requirements
• Extended operating temperature range (-55°C ~ 125°C) provides broader thermal operating envelope
• CE certification addition expands regulatory approval scope beyond the original CSA and UL certifications

Selection among the three substitute parts should be based on packaging requirements and inventory availability, as all three maintain identical electrical performance and mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 0318.375HXP, 0318.375MXP, or 0318.375VXP be used as direct replacements for the 0318.375H?

A: Yes. All three parts are direct electrical and mechanical equivalents. They share identical current rating (375 mA), voltage rating (250 V AC), fuse type (cartridge glass), response time (fast blow), package format (3AB/3AG), physical dimensions (0.275" Dia x 1.288" L), breaking capacity (35A), melting I²t (0.185), and DC cold resistance (0.825 Ohms). The substitute parts are pin-compatible and functionally interchangeable in all applications where the 0318.375H was specified.

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

A: The 0318.375HXP, 0318.375MXP, and 0318.375VXP are parametrically identical. Differences exist only in packaging format (all bulk) and inventory levels. Selection should be based on supplier availability and procurement requirements.

Q: Why is the 0318.375H classified as obsolete?

A: The 0318.375H has been superseded by active product variants. The substitute parts offer improved compliance status (ROHS3), expanded regulatory certifications (CE addition), and extended operating temperature specification, making them the current production equivalents.

Q: Are there any compatibility concerns when substituting the 0318.375H with active variants?

A: No compatibility concerns exist. The substitute parts maintain identical electrical specifications, mechanical dimensions, and mounting characteristics. They are designed as direct replacements and require no circuit modifications or design changes.

Q: What certifications do the substitute parts carry?

A: The substitute parts carry CE, CSA, and UL certifications, compared to CSA and UL for the original 0318.375H. This expanded certification scope supports broader market and regulatory requirements.