Littelfuse 0332004.HXP Ceramic Fuse Cartridge - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0332004.HXP is a 4 A, 250 V AC / 125 V DC ceramic fuse cartridge designed for fast-blow protection in electrical circuits. This component is classified as obsolete, requiring identification of active equivalent alternatives for continued system support and procurement. The 3AB/3AG form factor (1/4" x 1-1/4") is standard for industrial and commercial applications requiring reliable overcurrent protection with ceramic construction and fast response characteristics.

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)
Mounting Type	Requires Holder
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 0332004.HXP is determined by strict equivalence across the following critical 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)
Mounting Type: Requires Holder (exact match required)

All three substitute parts (0314004.HXP, 0314004.MXP, 0314004.VXP) meet these criteria and are classified as active products from Littelfuse Inc., belonging to the Series 314 product line. These parts provide direct functional equivalence with enhanced electrical performance characteristics compared to the obsolete Series 332 original part.

Parameter Comparison

Parameter	0332004.HXP (Original)	0314004.HXP	0314004.MXP	0314004.VXP
Manufacturer	Littelfuse Inc.	Littelfuse	Littelfuse Inc.	Littelfuse Inc.
Series	332	314	314	314
Product Status	Obsolete	Active	Active	Active
Current Rating	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"
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Breaking Capacity @ Rated Voltage	100A	750A AC, 10kA DC	750A AC, 10kA DC	750A AC, 10kA DC
Melting I²t	3.36	10.4	10.4	10.4
DC Cold Resistance	0.0179 Ohms	0.047 Ohms	0.047 Ohms	0.047 Ohms
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CE, cULus, PSE	CE, CSA, K-MARK, PSE, UL	CE, CSA, K-MARK, PSE, UL	CE, CSA, KC, PSE, UL
ECCN	EAR99	EAR99	EAR99	EAR99
HTSUS	8536.10.0040	8536.10.0040	8536.10.0040	8536.10.0040

Engineering Selection Recommendations

All three substitute parts (0314004.HXP, 0314004.MXP, 0314004.VXP) are functionally equivalent to the obsolete 0332004.HXP and are classified as active products with current manufacturing support. Selection among the three substitutes may be based on:

Approval agency requirements: 0314004.HXP and 0314004.MXP carry CSA and K-MARK certifications; 0314004.VXP carries KC certification in addition to CSA and K-MARK
Inventory availability: 0314004.MXP (2064 pcs), 0314004.HXP (1046 pcs), 0314004.VXP (1308 pcs)
REACH compliance status: All three substitute parts are REACH Unaffected

The Series 314 substitutes provide enhanced breaking capacity (750A AC, 10kA DC versus 100A) and higher melting I²t values (10.4 versus 3.36), representing improved electrical performance within the same form factor and functional specification.

Frequently Asked Questions (FAQ)

Q: Can 0314004.HXP, 0314004.MXP, or 0314004.VXP be used as direct replacements for 0332004.HXP?

A: Yes. All three parts are direct functional equivalents. They share identical current rating (4 A), voltage ratings (250 V AC / 125 V DC), fuse type (ceramic cartridge), response time (fast blow), and package dimensions (3AB, 3AG, 1/4" x 1-1/4"). All are compatible with standard 3AB/3AG fuse holders.

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

A: The three substitutes are parametrically equivalent across all critical electrical and mechanical specifications. Differences exist only in approval agency certifications and REACH compliance documentation. Selection should be based on specific regulatory requirements for the target application.

Q: Are there any compatibility concerns when replacing 0332004.HXP with Series 314 parts?

A: No compatibility concerns exist for standard applications. The Series 314 substitutes are pin-compatible and mechanically identical. The enhanced breaking capacity and melting I²t characteristics represent improved performance margins.

Q: What holder types are compatible with these fuse cartridges?

A: These fuses require a dedicated holder designed for 3AB or 3AG form factor cartridges with 1/4" diameter and 1-1/4" length dimensions. Standard industrial fuse holders rated for this form factor are compatible.

Q: Why is the original 0332004.HXP classified as obsolete?

A: The Series 332 product line has been superseded by the Series 314 line, which offers enhanced electrical performance and broader regulatory certifications while maintaining identical form factor and functional specifications.

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