Littelfuse 0314005.H Ceramic Fuse 5A 250VAC 125VDC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0314005.H is a 5 A ceramic cartridge fuse rated for 250 V AC and 125 V DC operation. This component is classified as obsolete, requiring identification of active equivalent alternatives for continued system support and procurement. The fuse operates with fast-blow response characteristics and requires a compatible holder (3AB, 3AG format). Substitute parts maintain identical electrical and mechanical specifications while offering improved product status and compliance certifications.

Key Parameters

Parameter	Value
Current Rating	5 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)
Mounting Type	Requires Holder
Operating Temperature Range	-55°C to 125°C
Breaking Capacity (AC)	750 A
Breaking Capacity (DC)	10 kA
Melting I²t	26
DC Cold Resistance	0.03 Ohms

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (5 A), AC voltage rating (250 V), DC voltage rating (125 V), fuse type (ceramic cartridge), response time (fast blow), and physical package dimensions (1/4" x 1-1/4"). All substitute parts listed maintain these core electrical and mechanical specifications.

The substitute parts are categorized as follows:

Direct Manufacturer Equivalent: 0314005.HXP maintains identical specifications with active product status and enhanced compliance certifications (CE, CSA, K-MARK, PSE, UL).

Parametric Equivalents: 0314005.MXP and 0314005.VXP provide full electrical and mechanical compatibility with active product status and RoHS3 compliance.

Series Variant: 0332005.HXP maintains electrical specifications but differs in breaking capacity (100 A AC versus 750 A AC) and melting I²t (6.25 versus 26). This part is classified as obsolete.

Parameter Comparison

Parameter	0314005.H	0314005.HXP	0314005.MXP	0314005.VXP	0332005.HXP
Current Rating (A)	5	5	5	5	5
Voltage AC (V)	250	250	250	250	250
Voltage DC (V)	125	125	125	125	125
Response Time	Fast Blow	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"	3AB, 3AG, 1/4" x 1-1/4"
Breaking Capacity AC (A)	750	750	750	750	100
Breaking Capacity DC (kA)	10	10	10	10	N/A
Melting I²t	26	26	26	26	6.25
DC Cold Resistance (Ohms)	0.03	0.03	0.03	0.03	0.0128
Product Status	Obsolete	Active	Active	Active	Obsolete
RoHS Status	Non-compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete 0314005.H, the 0314005.HXP is the primary selection. This part maintains identical electrical and mechanical specifications while offering active product status and expanded compliance certifications including CE, CSA, K-MARK, PSE, and UL.

The 0314005.MXP and 0314005.VXP provide equivalent parametric alternatives with active product status and RoHS3 compliance. Both parts are suitable for new designs and ongoing procurement.

The 0332005.HXP is not recommended as a substitute despite electrical equivalence. This part is classified as obsolete and exhibits reduced breaking capacity (100 A AC) and lower melting I²t (6.25), making it unsuitable for applications requiring the full 750 A AC breaking capacity of the original specification.

Frequently Asked Questions (FAQ)

Q: Can 0314005.HXP directly replace 0314005.H in existing applications? A: Yes. The 0314005.HXP maintains identical current rating (5 A), voltage ratings (250 V AC, 125 V DC), response time (fast blow), and physical dimensions (1/4" x 1-1/4"). Both parts require the same 3AB/3AG holder format.

Q: What is the difference between 0314005.MXP and 0314005.VXP? A: Both parts are parametric equivalents with identical electrical specifications and physical dimensions. The primary difference is in approval agency certifications: 0314005.MXP carries CE, CSA, K-MARK, PSE, and UL approvals, while 0314005.VXP carries CE, CSA, KC, PSE, and UL approvals.

Q: Why is 0332005.HXP not recommended as a substitute? A: Although 0332005.HXP maintains the same current rating, voltage ratings, and physical dimensions, it differs in critical performance parameters. The breaking capacity is reduced to 100 A AC (versus 750 A AC), and the melting I²t is 6.25 (versus 26). These differences indicate different fault-handling characteristics unsuitable for applications designed around the original 0314005.H specifications.

Q: Are all substitute parts compatible with existing 3AB/3AG fuse holders? A: Yes. All listed substitute parts maintain the 1/4" x 1-1/4" (6.35mm x 31.75mm) physical dimensions and are compatible with standard 3AB and 3AG holder formats.

Q: What compliance certifications should I prioritize for new designs? A: For new designs, select parts with RoHS3 compliance and active product status. The 0314005.HXP, 0314005.MXP, and 0314005.VXP all meet these criteria. The 0314005.HXP offers the broadest certification coverage (CE, CSA, K-MARK, PSE, UL).

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