Littelfuse 0318003.H Glass Cartridge Fuse 3A 250VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0318003.H is a 3 A, 250 V AC/DC glass cartridge fuse with fast-blow response characteristics, designed for through-hole mounting in 3AB and 3AG package formats. This part is classified as obsolete, making identification of active equivalent and substitute components essential for ongoing system support and procurement planning. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within the same application category.

Substiute Parts

0318003.H

Littelfuse Inc.In Stock: 9550318003.H Datasheet

Current PartRFQ

0318003.HXP

Littelfuse Inc.In Stock: 9220318003.HXP Datasheet

DirectRFQ

0318003.MXP

Littelfuse Inc.In Stock: 9150318003.MXP Datasheet

Parametric EquivalentRFQ

0318003.VXP

Littelfuse Inc.In Stock: 8600318003.VXP Datasheet

Parametric EquivalentRFQ

AGC-V-3-R

Eaton - Electronics DivisionIn Stock: 1059AGC-V-3-R Datasheet

MFR RecommendedRFQ

BK/AGC-V-3-R

Eaton - Electronics DivisionIn Stock: 796BK/AGC-V-3-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 0318003.H is determined by strict equivalence across the following critical parameters:

• Current Rating: 3 A (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 3AB, 3AG format (exact match required)
• Mounting Type: Through Hole (exact match required)

All substitute parts listed maintain these core electrical and mechanical specifications. Variations in breaking capacity, melting I²t, DC cold resistance, and approval certifications do not preclude substitution when the above parameters are identical.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the obsolete Littelfuse 0318003.H, the following selection criteria apply:

Littelfuse Direct Equivalents (0318003.HXP, 0318003.MXP, 0318003.VXP): These parts are manufactured by Littelfuse Inc. and maintain identical electrical specifications to the original component. All three are active products with ROHS3 compliance and extended approval certifications (CE, CSA, KC, PSE, UL). These represent the primary substitution path for direct replacement.

Eaton Alternatives (AGC-V-3-R, BK/AGC-V-3-R): These Eaton-manufactured parts meet all core electrical and mechanical requirements. The BK/AGC-V-3-R variant offers ROHS3 compliance and REACH compliance status. Both maintain CSA and UL approvals. Dimensional variation (0.266" Dia x 1.292" L versus 0.275" Dia x 1.288" L) is within acceptable tolerance for 3AB/3AG package compatibility.

Selection between Littelfuse and Eaton alternatives depends on existing supply chain relationships, inventory availability, and system-level compliance requirements. All listed substitutes are active products suitable for new procurement.

Frequently Asked Questions (FAQ)

Q: Can I use 0318003.HXP, 0318003.MXP, or 0318003.VXP interchangeably with the original 0318003.H?

A: Yes. These Littelfuse parts maintain identical current rating (3 A), voltage rating (250 V AC), fuse type (cartridge, glass), response time (fast blow), and package format (3AB, 3AG). All are electrically and mechanically compatible with the original component.

Q: What is the difference between the three Littelfuse substitutes (HXP, MXP, VXP)?

A: All three parts share identical electrical specifications and package dimensions. Differences exist only in packaging format (all listed as Bulk) and inventory availability. Selection among these three is based on procurement and supply chain considerations rather than technical performance.

Q: Are the Eaton AGC-V-3-R and BK/AGC-V-3-R parts compatible with the original 0318003.H?

A: Yes. Both Eaton parts meet the core electrical requirements (3 A, 250 V AC, fast-blow cartridge fuse, 3AB/3AG package). Minor dimensional variation (0.266" Dia x 1.292" L) is within acceptable tolerance for through-hole mounting in standard fuse holders designed for 3AB/3AG formats.

Q: What is the significance of the different melting I²t values (14 versus 45.9)?

A: Melting I²t defines the thermal energy required to melt the fuse element. The Littelfuse parts (I²t = 14) and Eaton parts (I²t = 45.9) have different thermal characteristics. Both values are provided in the component specifications and must be evaluated against circuit protection requirements. This parameter does not preclude substitution when all other electrical and mechanical specifications match.

Q: Does the higher breaking capacity of the substitute parts (100A versus 35A) affect compatibility?

A: No. Breaking capacity defines the maximum current the fuse can safely interrupt without rupturing. Higher breaking capacity provides enhanced safety margin and does not negatively impact circuit protection performance when all other specifications are identical.

Q: Are all substitute parts RoHS compliant?

A: The original 0318003.H is RoHS non-compliant. All listed substitutes (0318003.HXP, 0318003.MXP, 0318003.VXP, AGC-V-3-R, BK/AGC-V-3-R) are RoHS compliant or ROHS3 compliant, meeting current environmental regulations.

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

A: The original part carries CSA and UL approvals. Littelfuse substitutes add CE, KC, and PSE certifications. Eaton parts maintain CSA and UL approvals. Verify that the selected substitute meets all certifications required by your application standards and regional regulations.