Littelfuse 0318006.H Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0318006.H is a 6 A, 250 V AC/DC fast-blow glass cartridge fuse in 3AB/3AG package format (1/4" x 1-1/4" axial). This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. Active alternatives from the same manufacturer series provide enhanced specifications while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Current Rating	6 A
Voltage Rating (AC)	250 V
Response Time	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Fuse Type	Cartridge, Glass
Mounting Type	Through Hole
Size / Dimension	0.275" Dia x 1.288" L (6.99mm x 32.72mm)

Substitute Part Grouping Explanation

Substitute parts for the 0318006.H are qualified based on strict electrical and mechanical parameter matching:

Qualifying Criteria:

Current Rating: 6 A (exact match required)
Voltage Rating (AC): 250 V (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)

All three substitute parts (0318006.HXP, 0318006.MXP, 0318006.VXP) meet these criteria and are classified as direct manufacturer equivalents within the Littelfuse 318 series.

Parameter Comparison

Parameter	0318006.H (Main)	0318006.HXP	0318006.MXP	0318006.VXP
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	6 A	6 A	6 A	6 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
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)
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
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)
DC Cold Resistance	0.0177 Ohms	0.0178 Ohms	0.0178 Ohms	0.0178 Ohms
Breaking Capacity @ Rated Voltage	35 A	200 A	200 A	200 A
Melting I²t	81.1	118	118	118
Product Status	Obsolete	Active	Active	Active
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	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: 0318006.HXP, 0318006.MXP, or 0318006.VXP

All three substitute parts are functionally equivalent to the 0318006.H and are recommended for direct replacement. Selection among the three substitutes is based on packaging and availability:

0318006.HXP: 1235 pcs in stock (highest availability)
0318006.MXP: 833 pcs in stock
0318006.VXP: 786 pcs in stock

All substitutes are active products with enhanced specifications compared to the obsolete 0318006.H:

Increased breaking capacity (200 A vs. 35 A)
Higher melting I²t rating (118 vs. 81.1)
Extended regulatory approvals (CE, KC, PSE added)
ROHS3 compliance (vs. non-compliant original)
Defined operating temperature range (-55°C ~ 125°C)

These improvements provide superior performance margins and regulatory compliance for new designs and system upgrades.

Frequently Asked Questions (FAQ)

Q: Can 0318006.HXP, 0318006.MXP, and 0318006.VXP be used interchangeably with 0318006.H?

A: Yes. All three parts meet identical electrical and mechanical specifications: 6 A, 250 V AC/DC, fast-blow response, 3AB/3AG package, and 0.275" Dia x 1.288" L dimensions. They are direct functional equivalents suitable for drop-in replacement.

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

A: The three substitutes are electrically and mechanically identical. Differences are limited to packaging format (all bulk) and inventory levels. Selection should be based on availability and procurement lead times.

Q: Why do the substitute parts have higher breaking capacity (200 A vs. 35 A)?

A: The substitute parts represent current manufacturing specifications within the Littelfuse 318 series. The higher breaking capacity provides enhanced safety margins and is a standard specification for active products in this series.

Q: Are the substitute parts RoHS compliant?

A: Yes. All three substitute parts (0318006.HXP, 0318006.MXP, 0318006.VXP) are ROHS3 compliant. The original 0318006.H is RoHS non-compliant, making the substitutes necessary for applications requiring RoHS compliance.

Q: What regulatory approvals do the substitute parts carry?

A: All three substitutes carry CE, CSA, KC, PSE, and UL approvals. The original 0318006.H carries only CSA and UL approvals. The expanded certification set supports broader international market applications.

Q: Can I use these fuses in applications with operating temperatures below -55°C or above 125°C?

A: The substitute parts are rated for -55°C to 125°C operation. Applications requiring operation outside this range require separate evaluation against the specific environmental requirements.

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

A: DC cold resistance is 0.0177 Ohms for 0318006.H and 0.0178 Ohms for all substitutes. This 0.0001 Ohm difference is negligible for circuit design purposes.

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