Littelfuse 0314004.H Ceramic Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0314004.H is a 4 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 3AB/3AG form factor (0.250" Dia x 1.250" L) with 750 A AC / 10 kA DC breaking capacity serves applications requiring reliable overcurrent protection in industrial and commercial equipment.

Key Parameters

Parameter	Value
Current Rating	4 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 @ Rated Voltage	750 A AC, 10 kA DC
Melting I²t	10.4
DC Cold Resistance	0.047 Ohms
Operating Temperature Range	-55°C to 125°C

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters:

Current Rating: 4 A (exact match required)
Voltage Rating - AC: 250 V (exact match required)
Voltage Rating - DC: 125 V (exact match required)
Fuse Type: Cartridge, Ceramic (exact match required)
Response Time: Fast Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
Breaking Capacity @ Rated Voltage: 750 A AC, 10 kA DC (exact match required)
Melting I²t: 10.4 (exact match required)
DC Cold Resistance: 0.047 Ohms (exact match required)
Operating Temperature Range: -55°C to 125°C (exact match required)

All substitute parts listed below meet these criteria and are classified as active products with current manufacturing status.

Parameter Comparison

Parameter	0314004.H (Main)	0314004.HXP	0314004.MXP	0314004.VXP
Manufacturer	Littelfuse Inc.	Littelfuse	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	4 A	4 A	4 A	4 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	750 A AC, 10 kA DC	750 A AC, 10 kA DC	750 A AC, 10 kA DC	750 A AC, 10 kA DC
Melting I²t	10.4	10.4	10.4	10.4
DC Cold Resistance	0.047 Ohms	0.047 Ohms	0.047 Ohms	0.047 Ohms
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CSA, UL	CE, CSA, K-MARK, PSE, UL	CE, CSA, K-MARK, PSE, UL	CE, CSA, KC, PSE, UL

Engineering Selection Recommendations

All three substitute parts (0314004.HXP, 0314004.MXP, 0314004.VXP) are direct parametric equivalents to the obsolete 0314004.H and are suitable for replacement applications.

Product Status Consideration: The main part is classified as obsolete. All substitute parts are active products with current manufacturing status, ensuring long-term availability and supply chain continuity.

Compliance Advantage: The substitute parts are ROHS3 compliant, whereas the main part is RoHS non-compliant. This represents an improvement in environmental and regulatory compliance for new designs or system updates.

Certification Coverage: All substitute parts carry expanded approval agency certifications (CE, CSA, K-MARK, PSE, UL for 0314004.HXP and 0314004.MXP; CE, CSA, KC, PSE, UL for 0314004.VXP) compared to the main part (CSA, UL only). This broader certification scope supports deployment in international markets and applications with stringent regulatory requirements.

Packaging: All substitute parts are supplied in bulk packaging, consistent with industrial procurement practices.

Frequently Asked Questions (FAQ)

Q: Can 0314004.HXP, 0314004.MXP, or 0314004.VXP be used as direct replacements for 0314004.H?

A: Yes. All three parts are parametric equivalents with identical electrical and mechanical specifications: 4 A current rating, 250 V AC / 125 V DC voltage ratings, fast-blow response, 3AB/3AG form factor, 750 A AC / 10 kA DC breaking capacity, and 10.4 melting I²t. Physical dimensions and mounting requirements are identical.

Q: Why is the main part 0314004.H classified as obsolete?

A: The 0314004.H is listed as obsolete by the manufacturer. The active substitute parts (0314004.HXP, 0314004.MXP, 0314004.VXP) represent the current manufacturing alternatives and should be used for new procurement and system replacements.

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

A: The three substitute parts are parametrically identical. Differences exist only in approval agency certifications: 0314004.HXP and 0314004.MXP include K-MARK certification, while 0314004.VXP includes KC certification instead. Selection should be based on target market regulatory requirements.

Q: Are the substitute parts RoHS compliant?

A: Yes. All three substitute parts (0314004.HXP, 0314004.MXP, 0314004.VXP) are ROHS3 compliant, whereas the main part 0314004.H is RoHS non-compliant. This represents improved environmental compliance for applications subject to RoHS regulations.

Q: Do the substitute parts require the same holder as the main part?

A: Yes. All parts use the 3AB, 3AG form factor with identical dimensions (0.250" Dia x 1.250" L / 6.35mm x 31.75mm). Existing fuse holders designed for 0314004.H are compatible with all substitute parts without modification.

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

A: All parts, including the main part and substitutes, operate across the temperature range of -55°C to 125°C.

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