Littelfuse 0318001.H Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0318001.H is a 1 A, 250 V AC/DC fast-blow glass cartridge fuse with 3AB/3AG package configuration and 1/4" x 1-1/4" axial dimensions. This part is classified as obsolete. Direct substitutes with active product status are available from the same manufacturer, offering improved compliance and extended operating temperature range while maintaining identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Current Rating	1 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)
Breaking Capacity @ Rated Voltage	35 A
Melting I²t	0.76
DC Cold Resistance	0.189 Ohms
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution for the 0318001.H is determined by strict equivalence across the following parameters:

Current Rating: 1 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)
Physical Dimensions: 0.275" Dia x 1.288" L (exact match required)
Breaking Capacity: 35 A (exact match required)
Melting I²t: 0.76 (exact match required)

All substitute parts listed below meet these criteria and are manufactured by Littelfuse Inc. within the 318 series.

Parameter Comparison

Parameter	0318001.H (Main)	0318001.HXP	0318001.MXP	0318001.VXP
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	1 A	1 A	1 A	1 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)
Breaking Capacity @ Rated Voltage	35 A	35 A	35 A	35 A
Melting I²t	0.76	0.76	0.76	0.76
DC Cold Resistance	0.189 Ohms	0.19 Ohms	0.19 Ohms	0.19 Ohms
Product Status	Obsolete	Active	Active	Active
Operating Temperature	Not specified	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CSA, UL	CE, CSA, KC, PSE, UL	CE, CSA, KC, PSE, UL	CE, CSA, KC, PSE, UL
Packaging	-	Bulk	Bulk	Bulk

Engineering Selection Recommendations

The 0318001.H is obsolete and should be replaced with an active equivalent. All three substitute parts—0318001.HXP, 0318001.MXP, and 0318001.VXP—are electrically and mechanically identical to the main part and are manufactured by Littelfuse Inc.

Selection between the three active substitutes should be based on:

Product availability and inventory levels
Compliance requirements: All substitutes are ROHS3 compliant and carry expanded regulatory approvals (CE, CSA, KC, PSE, UL) compared to the obsolete part
Operating temperature specification: All substitutes are rated -55°C ~ 125°C, providing defined thermal performance not specified for the original part
Packaging format: All substitutes are supplied in bulk packaging

From an engineering standpoint, any of the three active substitutes provides equivalent performance with improved compliance and regulatory coverage.

Frequently Asked Questions (FAQ)

Q: Can 0318001.HXP, 0318001.MXP, or 0318001.VXP be used as direct replacements for 0318001.H?

A: Yes. All three parts are electrically and mechanically equivalent. They share identical current rating (1 A), voltage rating (250 V AC), fuse type (cartridge, glass), response time (fast blow), package configuration (3AB, 3AG), physical dimensions (0.275" Dia x 1.288" L), breaking capacity (35 A), and melting I²t (0.76). The primary differences are product status (active vs. obsolete), compliance certifications, and operating temperature specification.

Q: What is the difference between 0318001.HXP, 0318001.MXP, and 0318001.VXP?

A: These parts are parametrically equivalent. The suffix designations (HXP, MXP, VXP) indicate different packaging or distribution variants within the Littelfuse 318 series. All three are active products with identical electrical and mechanical specifications, ROHS3 compliance, and the same regulatory approvals (CE, CSA, KC, PSE, UL).

Q: Why is the original 0318001.H marked as obsolete?

A: The 0318001.H is classified as obsolete, indicating it is no longer in active production. Active equivalents are available from the same manufacturer with improved compliance status and extended operating temperature specification.

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

A: No. The substitute parts are pin-compatible, dimensionally identical, and electrically equivalent. They mount in the same through-hole configuration and fit the same 3AB/3AG fuse holder.

Q: What certifications do the substitute parts carry?

A: The substitute parts (0318001.HXP, 0318001.MXP, 0318001.VXP) carry CE, CSA, KC, PSE, and UL approvals. The original part carries CSA and UL approvals only.

Q: Is there a difference in DC cold resistance between the main part and substitutes?

A: The main part specifies 0.189 Ohms DC cold resistance, while the substitutes specify 0.19 Ohms. This difference is within normal manufacturing tolerance and does not affect functional equivalence.

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