Littelfuse 0312.031VXP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0312.031VXP is a 31 mA, 250 V AC/DC fast-blow glass cartridge fuse in 3AB/3AG package format (1/4" x 1-1/4"). This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing system support and new designs. The fuse requires a compatible holder for installation and operates across the temperature range of -55°C to 125°C.

Substiute Parts

0312.031VXP

Littelfuse Inc.In Stock: 12090312.031VXP Datasheet

Current PartRFQ

0313.031HXP

Littelfuse Inc.In Stock: 11870313.031HXP Datasheet

MFR RecommendedRFQ

AGC-1/32

Eaton - Electronics DivisionIn Stock: 770AGC-1/32 Datasheet

Parametric EquivalentRFQ

BK/AGC-1/32

Eaton - Electronics DivisionIn Stock: 1030BK/AGC-1/32 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0312.031VXP is determined by the following critical parameters:

• Current Rating: 31 mA (exact match required)
• Voltage Rating: 250 V AC minimum (DC capability optional)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (physical and electrical compatibility)
• Fuse Type: Cartridge, Glass (form factor requirement)
• Operating Temperature Range: -55°C ~ 125°C (environmental compatibility)

Substitute parts are grouped into two categories:

MFR Recommended Substitute: Littelfuse 0313.031HXP — same manufacturer, same current and voltage ratings, same package, with active product status. Primary difference is response time classification (slow blow vs. fast blow).

Parametric Equivalents: Eaton AGC-1/32 and BK/AGC-1/32 — alternative manufacturer parts meeting identical electrical and mechanical specifications, with active product status and established market availability.

Parameter Comparison

Engineering Selection Recommendations

For direct replacement with manufacturer continuity: Select Littelfuse 0313.031HXP. This part maintains Littelfuse product lineage, carries active product status, and holds CE, CSA, and UL certifications. The primary distinction is response time classification (slow blow vs. fast blow of the original); circuit design must accommodate this characteristic difference.

For cross-manufacturer substitution with fast-blow response: Select Eaton AGC-1/32. This part preserves the fast-blow response characteristic of the original 0312.031VXP, maintains identical electrical and mechanical specifications, and carries CSA and UL certifications. DC voltage rating of 250 V is explicitly specified.

For cost-optimized cross-manufacturer substitution: Select Eaton BK/AGC-1/32. This part meets all electrical and mechanical requirements and maintains fast-blow response. Note that RoHS compliance status is non-compliant, and approval agency certifications are not specified; suitability depends on application regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the 0313.031HXP replace the 0312.031VXP in all applications?

A: Both parts share identical current rating (31 mA), voltage rating (250 V AC), package format (3AB/3AG, 1/4" x 1-1/4"), and operating temperature range (-55°C to 125°C). The critical difference is response time: 0313.031HXP is slow blow, while 0312.031VXP is fast blow. Application circuits must tolerate the slower response characteristic.

Q: What is the difference between fast-blow and slow-blow fuses?

A: Fast-blow fuses interrupt circuits rapidly upon overcurrent, protecting against transient surges. Slow-blow fuses tolerate temporary current spikes and interrupt only during sustained overcurrent conditions. Selection depends on circuit load characteristics and protection requirements.

Q: Are the Eaton AGC-1/32 and BK/AGC-1/32 physically interchangeable?

A: Yes. Both Eaton parts are identical in physical dimensions (0.250" Dia x 1.250" L), package format (3AB/3AG), and electrical ratings (31 mA, 250 V AC). Both are fast-blow response. Differences exist in DC voltage rating specification and regulatory compliance documentation.

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

A: Selection depends on design requirements: (1) For Littelfuse ecosystem preference with active status and full certifications, use 0313.031HXP; (2) For fast-blow response preservation with cross-manufacturer option, use Eaton AGC-1/32; (3) For cost optimization without regulatory constraints, use Eaton BK/AGC-1/32.

Q: Are all substitute parts RoHS compliant?

A: The original 0312.031VXP and Littelfuse 0313.031HXP are ROHS3 compliant. Eaton AGC-1/32 compliance status is not specified. Eaton BK/AGC-1/32 is RoHS non-compliant. Regulatory requirements determine suitability for specific applications.

Q: What certifications do the substitute parts carry?

A: Littelfuse 0313.031HXP carries CE, CSA, and UL certifications. Eaton AGC-1/32 carries CSA and UL certifications. Eaton BK/AGC-1/32 carries no specified approval agency certifications. Application standards and regional regulations determine certification requirements.