Littelfuse 0318008.H Glass Cartridge Fuse 8A 250VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0318008.H is an 8 A, 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 and substitute parts necessary for ongoing system maintenance and new designs. The part maintains a through-hole mounting configuration with a breaking capacity of 35 A at rated voltage and a melting I²t value of 166.

Substiute Parts

0318008.H

Littelfuse Inc.In Stock: 11730318008.H Datasheet

Current PartRFQ

0318008.HXP

LittelfuseIn Stock: 8630318008.HXP Datasheet

DirectRFQ

0318008.MXP

Littelfuse Inc.In Stock: 27200318008.MXP Datasheet

Parametric EquivalentRFQ

0318008.VXP

Littelfuse Inc.In Stock: 7750318008.VXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 0318008.H is determined by strict equivalence across the following critical parameters:

• Current Rating: 8 A (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" (Axial) (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Mounting Type: Through Hole (exact match required)
• Size / Dimension: 0.275" Dia x 1.288" L (6.99mm x 32.72mm) (exact match required)
• Melting I²t: 166 (exact match required)

All substitute parts listed below meet these criteria. Differences in breaking capacity, operating temperature range, compliance certifications, and RoHS status do not affect functional substitution within the specified electrical and mechanical parameters.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts—0318008.HXP, 0318008.MXP, and 0318008.VXP—are functionally equivalent to the 0318008.H across all critical electrical and mechanical parameters. Selection among these active alternatives should be based on the following factors:

Product Status: The 0318008.H is obsolete. All substitute parts carry active product status, ensuring long-term availability and supply chain continuity.

Compliance and Certifications: The substitute parts hold expanded approval certifications (CE, CSA, KC, PSE, UL) compared to the original part (CSA, UL). This broader certification scope supports deployment in international markets and regulated applications.

RoHS Compliance: The substitute parts are ROHS3 compliant, whereas the original part is non-compliant. For applications subject to RoHS regulations, the substitute parts are required.

Breaking Capacity: The substitute parts provide 200 A breaking capacity at rated voltage, compared to 35 A for the original part. This enhanced capability does not affect substitution compatibility but may provide additional margin in fault scenarios.

Operating Temperature Range: The substitute parts specify an operating temperature range of -55°C to 125°C, providing defined thermal performance boundaries for system design.

Frequently Asked Questions (FAQ)

Q: Can 0318008.HXP, 0318008.MXP, and 0318008.VXP be used interchangeably with 0318008.H?

A: Yes. All three parts are functionally equivalent across current rating (8 A), voltage rating (250 V AC), response time (fast blow), package format (3AB, 3AG, 1/4" x 1-1/4" axial), fuse type (cartridge, glass), mounting type (through hole), physical dimensions (0.275" Dia x 1.288" L), and melting I²t (166). They are direct substitutes for the obsolete 0318008.H.

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

A: The three substitute parts are electrically and mechanically identical. Differences exist only in packaging (all listed as bulk), inventory levels, and potentially in manufacturing lot or distribution channel. From an engineering perspective, they are equivalent alternatives.

Q: Why does the breaking capacity differ between the original and substitute parts?

A: The original 0318008.H has a breaking capacity of 35 A, while the substitutes provide 200 A. This difference does not affect the fuse's primary function—protecting circuits at 8 A—but indicates improved fault-handling capability in the substitute designs. Both ratings are suitable for the specified electrical parameters.

Q: Are the substitute parts RoHS compliant?

A: Yes. All three substitute parts (0318008.HXP, 0318008.MXP, 0318008.VXP) are ROHS3 compliant. The original 0318008.H is RoHS non-compliant. For applications requiring RoHS compliance, the substitute parts must be used.

Q: What certifications do the substitute parts hold?

A: The substitute parts hold CE, CSA, KC, PSE, and UL certifications. The original part holds CSA and UL certifications. The expanded certification scope of the substitutes supports broader regulatory and market requirements.

Q: Can I use these fuses in high-temperature environments?

A: The substitute parts are rated for operation from -55°C to 125°C. The original part does not specify an operating temperature range. Confirm that your application environment falls within the -55°C to 125°C range for the substitute parts.

Q: Are there any mechanical compatibility concerns when substituting these parts?

A: No. All parts share identical physical dimensions (0.275" Dia x 1.288" L / 6.99mm x 32.72mm), package format (3AB, 3AG, 1/4" x 1-1/4" axial), and through-hole mounting configuration. Direct mechanical substitution is supported without modification to circuit board layouts or holder designs.