Littelfuse 0312.375H Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0312.375H is a 375 mA, 250 V AC/DC fast-blow glass cartridge fuse designed for 3AB and 3AG holder applications. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. Active alternatives from Littelfuse and Eaton provide direct functional replacement with improved compliance status and availability.

Substiute Parts

0312.375H

Littelfuse Inc.In Stock: 9920312.375H Datasheet

Current PartRFQ

0312.375HXP

Littelfuse Inc.In Stock: 11320312.375HXP Datasheet

DirectRFQ

0312.375MXP

Littelfuse Inc.In Stock: 22530312.375MXP Datasheet

Parametric EquivalentRFQ

0312.375VXP

Littelfuse Inc.In Stock: 10700312.375VXP Datasheet

Parametric EquivalentRFQ

AGC-3/8-R

Eaton - Electronics DivisionIn Stock: 885AGC-3/8-R Datasheet

Parametric EquivalentRFQ

BK/AGC-3/8-R

Eaton - Electronics DivisionIn Stock: 1184BK/AGC-3/8-R Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 0312.375H is determined by strict equivalence across the following parameters:

• Current Rating: 375 mA (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Breaking Capacity: 35A (exact match required)
• Operating Temperature: -55°C ~ 125°C (exact match required)

All substitute parts listed meet these criteria. Variations in DC Cold Resistance and Melting I²t values do not preclude substitution when all primary electrical and mechanical parameters align.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: Littelfuse 0312.375HXP, 0312.375MXP, or 0312.375VXP

These Littelfuse variants are direct functional equivalents to the 0312.375H with identical electrical and mechanical specifications. All three are active products with ROHS3 compliance and CE, CSA, and UL certifications. Selection among these three variants may be based on packaging preference (all are bulk packaged) and inventory availability.

Secondary Recommendation: Eaton AGC-3/8-R or BK/AGC-3/8-R

The Eaton AGC series fuses meet all primary electrical and mechanical parameters. Both variants are active products with full compliance certifications (CSA, UL). The BK/AGC-3/8-R offers ROHS3 compliance. DC Cold Resistance differs (0.703 Ohms vs. 0.825 Ohms), but this variation does not affect functional substitution within the specified electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can the 0312.375H be directly replaced with any of the listed substitutes?

A: Yes. All listed substitutes meet the required electrical and mechanical parameters: 375 mA current rating, 250 V AC voltage rating, fast-blow response, 3AB/3AG package compatibility, and 35A breaking capacity. Physical dimensions and holder compatibility are identical.

Q: What is the difference between the Littelfuse variants (0312.375HXP, 0312.375MXP, 0312.375VXP)?

A: All three Littelfuse variants are electrically and mechanically identical to the 0312.375H. Differences are limited to packaging designation and internal manufacturing codes. Selection should be based on availability and procurement requirements.

Q: Why do the Eaton AGC fuses have different DC Cold Resistance values?

A: DC Cold Resistance variation (0.703 Ohms for Eaton vs. 0312.375H at 0.825 Ohms) reflects different internal construction but does not affect fuse performance within the specified electrical operating range. Both values are within acceptable limits for 375 mA, 250 V fast-blow cartridge fuses.

Q: Are all substitutes compatible with existing 3AB and 3AG holders?

A: Yes. All substitute parts share identical physical dimensions (0.250" Dia x 1.250" L / 6.35mm x 31.75mm) and are designed for 3AB and 3AG holder applications. No mechanical modification is required.

Q: What compliance certifications should I verify for my application?

A: The 0312.375H carries CSA and UL approvals. Littelfuse substitutes add CE certification. Eaton AGC variants carry CSA and UL approvals. Verify that your application requirements align with the certifications of your selected substitute.

Q: Is the obsolete status of the 0312.375H a concern for long-term supply?

A: The 0312.375H is classified as obsolete. All recommended substitutes are active products with established supply chains. Transitioning to an active equivalent ensures continued availability and support.