Littelfuse 031201.8H Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 031201.8H is a 1.8 A, 250 V AC/DC fast-blow glass cartridge fuse in the 312 series, designed for 3AB and 3AG holder applications with dimensions of 1/4" x 1-1/4" (6.35mm x 31.75mm). This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. Direct manufacturer alternatives and parametric equivalents from Littelfuse and Eaton are available to maintain circuit protection functionality.

Substiute Parts

031201.8H

Littelfuse Inc.In Stock: 928031201.8H Datasheet

Current PartRFQ

031201.8HXP

Littelfuse Inc.In Stock: 709031201.8HXP Datasheet

DirectRFQ

031201.8MXP

Littelfuse Inc.In Stock: 946031201.8MXP Datasheet

Parametric EquivalentRFQ

031201.8VXP

Littelfuse Inc.In Stock: 881031201.8VXP Datasheet

Parametric EquivalentRFQ

AGC-1-8/10-R

Eaton - Electronics DivisionIn Stock: 1039AGC-1-8/10-R Datasheet

Parametric EquivalentRFQ

BK/AGC-1-8/10-R

Eaton - Electronics DivisionIn Stock: 1144BK/AGC-1-8/10-R Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 031201.8H is determined by strict equivalence across the following parameters: current rating (1.8 A), voltage rating (250 V AC), response time (fast blow), fuse type (cartridge glass), package designation (3AB, 3AG), physical dimensions (1/4" x 1-1/4"), and mounting requirement (holder-based). All substitute parts listed maintain these core electrical and mechanical specifications, ensuring direct functional replacement within the same circuit protection application.

The substitute parts are grouped into two categories:

Direct Manufacturer Equivalents (Littelfuse 312 Series): Parts 031201.8HXP, 031201.8MXP, and 031201.8VXP are active-status alternatives from the same manufacturer and series, offering improved compliance and higher breaking capacity ratings.

Parametric Equivalents (Cross-Manufacturer): Parts AGC-1-8/10-R and BK/AGC-1-8/10-R from Eaton Electronics Division meet all core electrical and mechanical parameters, providing alternative sourcing while maintaining compatibility with 3AB and 3AG holders.

Parameter Comparison

Engineering Selection Recommendations

For new designs and ongoing maintenance applications, the Littelfuse 031201.8HXP, 031201.8MXP, or 031201.8VXP are preferred substitutes. All three are active-status products with ROHS3 compliance, higher breaking capacity (100 A versus 35 A), and expanded approval certifications (CE, CSA, PSE, UL). These parts maintain identical electrical and mechanical specifications to the obsolete 031201.8H while offering improved regulatory compliance and supply chain availability.

The Eaton AGC-1-8/10-R and BK/AGC-1-8/10-R provide cross-manufacturer alternatives with active product status and RoHS compliance. These parts are suitable for applications where multi-source qualification is required or where Eaton components are preferred within the supply chain.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 031201.8H with 031201.8HXP, 031201.8MXP, or 031201.8VXP?

A: Yes. All three Littelfuse alternatives maintain identical current rating (1.8 A), voltage rating (250 V AC), response time (fast blow), fuse type (cartridge glass), package designation (3AB, 3AG), and physical dimensions (1/4" x 1-1/4"). They are mechanically and electrically interchangeable within the same holder-based mounting application.

Q: What is the difference between 031201.8HXP, 031201.8MXP, and 031201.8VXP?

A: These three parts are parametric equivalents with identical electrical and mechanical specifications. The suffix designations (HXP, MXP, VXP) indicate different internal construction or material variants within the Littelfuse 312 series, but all meet the same performance criteria for 1.8 A, 250 V AC fast-blow operation.

Q: Are Eaton AGC-1-8/10-R and BK/AGC-1-8/10-R compatible with the same holders as 031201.8H?

A: Yes. Both Eaton parts are specified for 3AB and 3AG holder applications with identical dimensions (1/4" x 1-1/4"). They are mechanically compatible and electrically equivalent for the same circuit protection function.

Q: Why does 031201.8H show a lower breaking capacity (35 A) compared to the substitute parts (100 A)?

A: The breaking capacity difference reflects design improvements in the active-status substitute parts. All parts maintain the same 1.8 A current rating and 250 V voltage rating, ensuring identical circuit protection response. The higher breaking capacity in newer designs provides enhanced safety margin under fault conditions.

Q: Is RoHS compliance a factor in selecting a substitute?

A: RoHS compliance status is provided for regulatory and procurement purposes. The 031201.8H is RoHS non-compliant, while all substitute parts (Littelfuse ROHS3 and Eaton RoHS compliant) meet current environmental standards. Selection should align with your application's regulatory requirements.

Q: Can I use AGC-1-8/10-R or BK/AGC-1-8/10-R in legacy systems designed for 031201.8H?

A: Yes. Both Eaton parts are parametric equivalents with matching electrical ratings, response time, and physical dimensions. They are suitable for direct replacement in existing applications requiring 1.8 A, 250 V AC fast-blow cartridge fuses in 3AB or 3AG holders.