Littelfuse 0314008.H Ceramic Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0314008.H is an 8 A, 250 V AC / 125 V DC ceramic cartridge fuse with fast-blow response characteristics. This component is classified as obsolete, requiring identification of active equivalent alternatives for continued system support and procurement. The fuse is designed for use with 3AB, 3AG holder configurations and operates across a temperature range of -55°C to 125°C.

Key Parameters

Parameter	Value
Current Rating	8 A
Voltage Rating (AC)	250 V
Voltage Rating (DC)	125 V
Fuse Type	Cartridge, Ceramic
Response Time	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (6.35mm x 31.75mm)
Breaking Capacity (AC)	750 A
Breaking Capacity (DC)	10 kA
Melting I²t	105
Operating Temperature Range	-55°C to 125°C
DC Cold Resistance	0.0153 Ohms

Substitute Part Grouping Explanation

Substitution eligibility for the 0314008.H is determined by strict equivalence across the following parameters: current rating (8 A), AC voltage rating (250 V), DC voltage rating (125 V), fuse type (ceramic cartridge), response time (fast blow), physical package dimensions (1/4" x 1-1/4"), breaking capacity ratings (750 A AC / 10 kA DC), and melting I²t value (105). All identified substitutes maintain these electrical and mechanical specifications without deviation.

The substitute parts 0314008.HXP, 0314008.MXP, and 0314008.VXP are all active-status variants within the Littelfuse 314 series, differentiated primarily by packaging configuration (bulk) and regulatory compliance certifications rather than electrical performance.

Parameter Comparison

Parameter	0314008.H (Main)	0314008.HXP	0314008.MXP	0314008.VXP
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	8 A	8 A	8 A	8 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Voltage Rating - DC	125 V	125 V	125 V	125 V
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
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"
Breaking Capacity @ Rated Voltage (AC)	750 A	750 A	750 A	750 A
Breaking Capacity @ Rated Voltage (DC)	10 kA	10 kA	10 kA	10 kA
Melting I²t	105	105	105	105
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
DC Cold Resistance	0.0153 Ohms	0.0153 Ohms	0.0153 Ohms	0.153 Ohms
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agencies	CSA, UL	CE, CSA, K-MARK, PSE, UL	CE, CSA, K-MARK, PSE, UL	CE, CSA, KC, PSE, UL

Engineering Selection Recommendations

For applications currently using the obsolete 0314008.H, direct substitution is supported by 0314008.HXP, 0314008.MXP, and 0314008.VXP. All three alternatives maintain identical electrical specifications and physical dimensions, ensuring mechanical and electrical compatibility within existing holder assemblies.

Selection between active alternatives should be based on regulatory compliance requirements for the target market. The 0314008.HXP and 0314008.MXP variants carry CE, CSA, K-MARK, PSE, and UL certifications. The 0314008.VXP variant carries CE, CSA, KC, PSE, and UL certifications. All three are ROHS3 compliant and REACH unaffected.

Note: The 0314008.VXP exhibits a DC cold resistance of 0.153 Ohms, which differs from the 0.0153 Ohms specification of the main part and other substitutes. This parameter variance does not affect substitution eligibility but should be documented for circuit analysis purposes.

Frequently Asked Questions (FAQ)

Q: Can 0314008.HXP, 0314008.MXP, and 0314008.VXP be used interchangeably with 0314008.H?

A: Yes. All three substitute parts maintain identical current ratings (8 A), voltage ratings (250 V AC / 125 V DC), fuse type (ceramic cartridge), response time (fast blow), physical dimensions (1/4" x 1-1/4"), breaking capacity (750 A AC / 10 kA DC), and melting I²t (105). They are mechanically and electrically compatible with existing 3AB and 3AG holder configurations.

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

A: The substitute parts differ in product status (all active versus the obsolete main part), packaging configuration (bulk), and regulatory certifications. The 0314008.VXP has a different DC cold resistance specification (0.153 Ohms versus 0.0153 Ohms for the others), which should be considered in circuit design analysis.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three substitute parts (0314008.HXP, 0314008.MXP, and 0314008.VXP) are ROHS3 compliant, whereas the original 0314008.H is RoHS non-compliant.

Q: Which substitute part should be selected for international applications?

A: Selection depends on target market requirements. The 0314008.HXP and 0314008.MXP carry CE, CSA, K-MARK, PSE, and UL certifications. The 0314008.VXP carries CE, CSA, KC, PSE, and UL certifications. Verify specific regional compliance requirements before final selection.

Q: Are there any inventory considerations for these substitutes?

A: Current inventory levels are: 0314008.HXP (2000 pcs), 0314008.MXP (1151 pcs), and 0314008.VXP (909 pcs). All are available as new original stock.

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