Littelfuse 0232002.MXW Glass Cartridge Fuse 2A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0232002.MXW is a 2 A, 250 V AC/DC glass cartridge fuse in 5mm x 20mm form factor, classified as obsolete. This fuse requires a holder for installation and operates across a temperature range of -55°C to 125°C with medium blow response characteristics. Due to its obsolete product status, equivalent and substitute parts from active product lines are necessary for ongoing system maintenance and new designs requiring compatible fuse protection.

Key Parameters

Parameter	Value
Current Rating	2 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Medium Blow
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	100 A
Operating Temperature Range	-55°C to 125°C
RoHS Status	RoHS non-compliant (main part); ROHS3 compliant (substitutes)

Substitute Part Grouping Explanation

Substitution for the 0232002.MXW is determined by strict equivalence in electrical and mechanical parameters: current rating (2 A), voltage rating (250 V AC), fuse type (cartridge glass), package dimensions (5mm x 20mm), response time (medium blow), and mounting requirement (holder-based installation). All substitute parts maintain these core parameters, ensuring direct functional compatibility within existing fuse holder assemblies.

Substitute parts are grouped into two categories:

Littelfuse Series 232 and 234 (Active Status): Parts 0232002.MXEP, 0232002.MXF22P, 0232002.MXF34P, 0232002.MXF5P, 0232002.MXP, 0234002.MXBP, and 0234002.MXP represent active production alternatives from Littelfuse with full regulatory compliance (CE, KC, PSE, UL, CSA certifications).

OptiFuse MSC Series (Active Status): Part MSC-2A provides an alternative from a different manufacturer while maintaining identical electrical and mechanical specifications.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage Rating (AC)	Package	Response Time	Breaking Capacity	Melting I²t	DC Cold Resistance (Ω)	Product Status	RoHS Status
0232002.MXW	Littelfuse	2 A	250 V	5mm x 20mm	Medium Blow	100 A	8.47	0.0385	Obsolete	Non-compliant
0232002.MXEP	Littelfuse	2 A	250 V	5.80mm x 22.50mm (Axial)	Medium Blow	100 A	8.25	0.037	Active	ROHS3 Compliant
0232002.MXF22P	Littelfuse	2 A	250 V	5mm x 20mm	Medium Blow	100 A	8.25	0.037	Active	ROHS3 Compliant
0232002.MXF34P	Littelfuse	2 A	250 V	5mm x 20mm	Medium Blow	100 A	8.25	0.037	Active	ROHS3 Compliant
0232002.MXF5P	Littelfuse	2 A	250 V	5mm x 20mm	Medium Blow	100 A	8.25	0.037	Active	ROHS3 Compliant
0232002.MXP	Littelfuse	2 A	250 V	5mm x 20mm	Medium Blow	100 A	8.25	0.037	Active	ROHS3 Compliant
0234002.MXBP	Littelfuse	2 A	250 V	5mm x 20mm	Medium Blow	100 A	9.97	0.0684	Active	ROHS3 Compliant
0234002.MXP	Littelfuse	2 A	250 V	5mm x 20mm	Medium Blow	100 A	9.97	0.0684	Active	ROHS3 Compliant
MSC-2A	OptiFuse	2 A	250 V	5mm x 20mm	Medium Blow	100 A	4.888	—	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Littelfuse Series 232 Active Production): Parts 0232002.MXF22P, 0232002.MXF34P, 0232002.MXF5P, and 0232002.MXP are direct mechanical and electrical equivalents with identical 5mm x 20mm package dimensions. These parts carry active product status with full regulatory certifications (CE, KC, PSE) and ROHS3 compliance, making them suitable for new designs and maintenance applications requiring RoHS-compliant components.

Secondary Substitute (Littelfuse Series 234): Parts 0234002.MXBP and 0234002.MXP maintain identical electrical and mechanical specifications but exhibit higher melting I²t values (9.97 versus 8.25-8.47) and increased DC cold resistance (0.0684 Ω versus 0.037-0.0385 Ω). These parts carry expanded regulatory approvals (CE, CSA, K-MARK, PSE, UL) and are suitable where enhanced certification coverage is required.

Alternative Manufacturer (OptiFuse MSC Series): Part MSC-2A provides equivalent electrical and mechanical performance from OptiFuse with cULus and UL 248 certifications. This part exhibits lower melting I²t (4.888) compared to Littelfuse alternatives, which may affect response characteristics in specific circuit protection scenarios.

Axial Configuration Option: Part 0232002.MXEP offers through-hole mounting with axial lead configuration (5.80mm x 22.50mm) for applications requiring direct PCB soldering rather than holder-based installation. This part is not mechanically compatible with standard 5mm x 20mm fuse holders.

Frequently Asked Questions (FAQ)

Q: Can 0232002.MXEP be used as a direct replacement in existing fuse holders?

A: No. The 0232002.MXEP features axial lead configuration with dimensions of 5.80mm x 22.50mm and through-hole mounting, making it incompatible with standard 5mm x 20mm fuse holder assemblies. This part is designed for direct PCB soldering applications only.

Q: What is the difference between Littelfuse Series 232 and Series 234 substitutes?

A: Both series maintain identical current rating (2 A), voltage rating (250 V), and package dimensions (5mm x 20mm). Series 234 parts exhibit higher melting I²t values (9.97 versus 8.25) and increased DC cold resistance (0.0684 Ω versus 0.037 Ω), resulting in different thermal response characteristics. Series 234 also carries broader regulatory approvals including UL and CSA certifications.

Q: Is the OptiFuse MSC-2A electrically equivalent to Littelfuse parts?

A: The MSC-2A matches the 2 A current rating, 250 V voltage rating, 5mm x 20mm package, and 100 A breaking capacity. However, it exhibits significantly lower melting I²t (4.888 versus 8.25-9.97), indicating faster thermal response. This difference may affect circuit protection timing in applications with specific I²t requirements.

Q: Are all substitute parts RoHS compliant?

A: The original 0232002.MXW is RoHS non-compliant. All substitute parts listed (Littelfuse Series 232, Series 234, and OptiFuse MSC-2A) are ROHS3 compliant, meeting current environmental regulations for new designs and regulated markets.

Q: Which substitute offers the broadest regulatory certification coverage?

A: Parts 0234002.MXBP and 0234002.MXP carry the most comprehensive approvals: CE, CSA, K-MARK, PSE, and UL. These certifications cover North American (UL, CSA), European (CE), Korean (K-MARK), and Japanese (PSE) regulatory requirements.

Q: Can substitutes be mixed within the same circuit or system?

A: All listed substitutes maintain identical electrical parameters (2 A, 250 V, 100 A breaking capacity, medium blow response) and mechanical compatibility with standard 5mm x 20mm fuse holders. However, differences in melting I²t and DC cold resistance between Series 232, Series 234, and OptiFuse MSC-2A may result in different thermal response times. Circuit design should account for these variations if multiple substitute types are used in parallel protection schemes.

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