Littelfuse 0318007.H Glass Cartridge Fuse 7A 250VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0318007.H is a 7A 250VAC glass cartridge fuse with 3AB/3AG package configuration, designed for through-hole mounting in electrical protection circuits. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and component procurement. Active alternatives from the same manufacturer series maintain identical electrical and mechanical specifications while offering improved compliance and availability.

Key Parameters

Parameter	Value
Current Rating	7 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)
Mounting Type	Through Hole
Size / Dimension	0.275" Dia x 1.288" L (6.99mm x 32.72mm)
Melting I²t	118
DC Cold Resistance	0.0145 Ohms

Substitute Part Grouping Explanation

Substitution eligibility for the 0318007.H is determined by strict equivalence across the following parameters: current rating (7A), voltage rating (250VAC), fuse type (cartridge glass), response time (fast blow), package configuration (3AB/3AG), physical dimensions (0.275" Dia x 1.288" L), and thermal characteristics (melting I²t of 118). All three substitute parts—0318007.HXP, 0318007.MXP, and 0318007.VXP—meet these criteria and are manufactured by Littelfuse within the same 318 series. These substitutes are classified as direct manufacturer equivalents with active product status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Parameter	0318007.H (Main)	0318007.HXP	0318007.MXP	0318007.VXP
Current Rating (Amps)	7 A	7 A	7 A	7 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"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"
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)
Melting I²t	118	118	118	118
DC Cold Resistance	0.0145 Ohms	0.0146 Ohms	0.0146 Ohms	0.0146 Ohms
Product Status	Obsolete	Active	Active	Active
Breaking Capacity @ Rated Voltage	35A	200A	200A	200A
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
Operating Temperature	Not specified	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C

Engineering Selection Recommendations

All three substitute parts (0318007.HXP, 0318007.MXP, 0318007.VXP) are direct functional equivalents suitable for replacing the obsolete 0318007.H in new designs and existing applications. The substitutes offer enhanced compliance through ROHS3 certification and expanded regulatory approvals (CE, KC, PSE in addition to CSA and UL). Breaking capacity has been increased from 35A to 200A, providing improved fault protection margins. DC cold resistance remains within acceptable tolerance (0.0146 Ohms versus 0.0145 Ohms). Operating temperature range (-55°C ~ 125°C) is specified for the active substitutes, enabling broader environmental application. Selection among the three substitutes should be based on packaging requirements and inventory availability: 0318007.HXP (983 units), 0318007.MXP (1118 units), or 0318007.VXP (663 units).

Frequently Asked Questions (FAQ)

Q: Can 0318007.HXP, 0318007.MXP, and 0318007.VXP be used interchangeably with 0318007.H?

A: Yes. All three parts maintain identical electrical ratings (7A, 250VAC), fuse type (cartridge glass), response time (fast blow), and physical dimensions (0.275" Dia x 1.288" L). They are direct functional equivalents within the Littelfuse 318 series.

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

A: The three substitutes are electrically and mechanically identical. Differences exist only in packaging format (all bulk) and inventory levels. Selection should be based on procurement availability and supply chain requirements.

Q: Why does the obsolete 0318007.H have a lower breaking capacity (35A) compared to the active substitutes (200A)?

A: Breaking capacity specifications reflect design improvements and updated testing standards between the obsolete and active product generations. The higher breaking capacity of the substitutes provides enhanced fault protection without affecting normal operation at the 7A rated current.

Q: Are the substitute parts RoHS compliant?

A: Yes. All three substitute parts (0318007.HXP, 0318007.MXP, 0318007.VXP) are ROHS3 compliant. The original 0318007.H is RoHS non-compliant, making the substitutes necessary for applications requiring RoHS certification.

Q: What regulatory certifications do the substitute parts carry?

A: The substitute parts carry CE, CSA, KC, PSE, and UL certifications. The original part carries only CSA and UL certifications, making the substitutes suitable for broader international applications.

Q: Is the DC cold resistance difference (0.0145 Ohms vs 0.0146 Ohms) significant?

A: No. The difference of 0.0001 Ohms is negligible and falls within normal manufacturing tolerance for glass cartridge fuses. Both values are functionally equivalent for circuit protection applications.

Q: What is the operating temperature range for these fuses?

A: The substitute parts operate across -55°C to 125°C. The original part does not specify an operating temperature range. The specified range for substitutes enables use in broader environmental conditions.

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