Littelfuse 0318002.H Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0318002.H is a 2A 250VAC glass cartridge fuse with fast-blow response characteristics, designed for through-hole mounting in 3AB/3AG package format (1/4" x 1-1/4" axial). This component is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for seamless circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	2 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Size / Dimension	0.275" Dia x 1.288" L (6.99mm x 32.72mm)
Mounting Type	Through Hole
Melting I²t	5.2
DC Cold Resistance	0.07 Ohms

Substitute Part Grouping Explanation

Substitution of the obsolete 0318002.H is based on strict equivalence across the following critical parameters:

Current Rating: 2 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, 1/4" x 1-1/4" (Axial) (exact match required)
Size / Dimension: 0.275" Dia x 1.288" L (6.99mm x 32.72mm) (exact match required)
Mounting Type: Through Hole (exact match required)

All three substitute parts—0318002.HXP, 0318002.MXP, and 0318002.VXP—meet these criteria and are classified as active products from Littelfuse Inc., ensuring continued availability and support.

Parameter Comparison

Parameter	0318002.H (Main)	0318002.HXP	0318002.MXP	0318002.VXP
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	2 A	2 A	2 A	2 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Size / Dimension	0.275" Dia x 1.288" L (6.99mm x 32.72mm)	0.275" Dia x 1.288" L (6.99mm x 32.72mm)	0.275" Dia x 1.288" L (6.99mm x 32.72mm)	0.275" Dia x 1.288" L (6.99mm x 32.72mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Melting I²t	5.2	5.2	5.2	5.2
DC Cold Resistance	0.07 Ohms	0.0704 Ohms	0.0704 Ohms	0.0704 Ohms
Product Status	Obsolete	Active	Active	Active
Breaking Capacity @ Rated Voltage	35A	100A	100A	100A
Approval Agency	CSA, UL	CE, CSA, KC, PSE, UL	CE, CSA, KC, PSE, UL	CE, CSA, KC, PSE, UL
Operating Temperature	Not specified	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All three substitute parts—0318002.HXP, 0318002.MXP, and 0318002.VXP—are direct parametric equivalents to the obsolete 0318002.H. Selection among these active alternatives should be based on the following factors:

Product Status & Availability: All substitutes are classified as active products with confirmed inventory levels (0318002.HXP: 712 pcs, 0318002.MXP: 948 pcs, 0318002.VXP: 653 pcs), ensuring long-term supply continuity.

Regulatory Compliance: The substitute parts carry expanded approval certifications (CE, CSA, KC, PSE, UL) compared to the original part (CSA, UL), providing broader international compliance coverage for applications requiring multi-region certification.

Breaking Capacity Enhancement: Substitute parts feature 100A breaking capacity at rated voltage, compared to 35A for the original part, offering improved fault protection margins without altering circuit protection characteristics.

Operating Temperature Range: Substitute parts specify -55°C ~ 125°C operating temperature, providing defined thermal performance parameters absent from the original part specification.

Frequently Asked Questions (FAQ)

Q: Can 0318002.HXP, 0318002.MXP, or 0318002.VXP be used as direct replacements for 0318002.H?

A: Yes. All three substitute parts maintain identical electrical ratings (2A, 250VAC), fuse type (cartridge, glass), response time (fast blow), and mechanical dimensions (3AB/3AG, 1/4" x 1-1/4" axial). They are functionally equivalent for circuit protection applications.

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

A: The three substitute parts (0318002.HXP, 0318002.MXP, 0318002.VXP) are parametrically identical. Differences exist only in packaging designation and inventory availability. Selection may be based on supply chain preference or specific procurement requirements.

Q: Are there any compatibility concerns when substituting the obsolete part?

A: No compatibility concerns exist. The substitute parts are designed for identical through-hole mounting in 3AB/3AG package format with matching physical dimensions. No circuit board modifications or design changes are required.

Q: Do the substitute parts meet the same regulatory standards?

A: The substitute parts exceed the original certification scope. While 0318002.H carries CSA and UL approvals, all substitute parts carry CE, CSA, KC, PSE, and UL certifications, providing broader international compliance coverage.

Q: What is the significance of the higher breaking capacity in substitute parts?

A: The substitute parts feature 100A breaking capacity compared to 35A in the original part. This represents an enhanced fault protection margin and does not affect normal circuit operation. The fuse will still operate at the specified 2A current rating.

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