Littelfuse 0233003.M Glass Cartridge Fuse 3A 125VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0233003.M is a 3A 125VAC glass cartridge fuse with 5x20mm dimensions, designed for medium-blow response applications requiring a fuse holder. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new designs. Active alternatives from Littelfuse maintain identical electrical and mechanical specifications while offering improved compliance status and broader certification coverage.

Key Parameters

Parameter	Value
Current Rating	3 A
Voltage Rating (AC)	125 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Medium Blow
Breaking Capacity @ Rated Voltage	10kA
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (3A), voltage rating (125VAC), fuse type (cartridge glass), physical dimensions (5x20mm), response time (medium blow), breaking capacity (10kA), and operating temperature range (-55°C to 125°C). All listed substitute parts meet these criteria without exception.

The substitute parts are grouped into two series categories:

Series 232 Substitutes: 0232003.MX125P, 0232003.MXF22125P, 0232003.MXF5125P

Series 233 Substitutes: 0233003.MXP, 0233003.MXF4P, 0233003.MXBP

All substitutes are available in bulk packaging and maintain active product status, distinguishing them from the obsolete main part.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating	Voltage Rating (AC)	Package / Case	Response Time	Breaking Capacity	Operating Temperature	DC Cold Resistance	Melting I²t	Product Status	RoHS Status
0233003.M	Littelfuse Inc.	233	3 A	125 V	5mm x 20mm	Medium Blow	10kA	-55°C ~ 125°C	0.043 Ohms	27	Obsolete	RoHS non-compliant
0232003.MX125P	Littelfuse Inc.	232	3 A	125 V	5mm x 20mm	Medium Blow	10kA	-55°C ~ 125°C	0.0226 Ohms	17.19	Active	ROHS3 Compliant
0232003.MXF22125P	Littelfuse Inc.	232	3 A	125 V	5mm x 20mm	Medium Blow	10kA	-55°C ~ 125°C	0.0226 Ohms	17.19	Active	ROHS3 Compliant
0232003.MXF5125P	Littelfuse Inc.	232	3 A	125 V	5mm x 20mm	Medium Blow	10kA	-55°C ~ 125°C	0.0226 Ohms	17.19	Active	ROHS3 Compliant
0233003.MXBP	Littelfuse Inc.	233	3 A	125 V	5mm x 20mm	Medium Blow	10kA	-55°C ~ 125°C	0.0431 Ohms	26.24	Active	ROHS3 Compliant
0233003.MXF4P	Littelfuse Inc.	233	3 A	125 V	5mm x 20mm	Medium Blow	10kA	-55°C ~ 125°C	0.0431 Ohms	26.24	Active	ROHS3 Compliant
0233003.MXP	Littelfuse Inc.	233	3 A	125 V	5mm x 20mm	Medium Blow	10kA	-55°C ~ 125°C	0.0431 Ohms	26.24	Active	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts maintain functional equivalence to the 0233003.M across critical electrical and mechanical parameters. Selection should prioritize active product status and compliance requirements:

Series 233 Substitutes (0233003.MXP, 0233003.MXF4P, 0233003.MXBP) maintain the closest resistance and melting I²t characteristics to the original part. These parts carry CE, CSA, KC, PSE, and UL certifications and are ROHS3 compliant. The 0233003.MXP variant offers the highest inventory availability (3081 units).

Series 232 Substitutes (0232003.MX125P, 0232003.MXF22125P, 0232003.MXF5125P) provide active alternatives with CE, KC, and PSE certifications and ROHS3 compliance. These parts exhibit lower DC cold resistance (0.0226 Ohms) and lower melting I²t values (17.19) compared to the original specification.

For applications requiring certification alignment with the original part's UL and CSA approvals, Series 233 substitutes are the appropriate selection. For general-purpose replacements where CE, KC, and PSE certifications are sufficient, Series 232 alternatives are available.

Frequently Asked Questions (FAQ)

Q: Can Series 232 and Series 233 substitutes be used interchangeably with the 0233003.M?

A: All listed substitutes maintain identical current rating (3A), voltage rating (125VAC), physical dimensions (5x20mm), response time (medium blow), and breaking capacity (10kA). Functional interchangeability is established. Certification requirements and compliance status should guide selection based on application needs.

Q: What is the difference between Series 232 and Series 233 substitutes?

A: Series 232 parts exhibit lower DC cold resistance (0.0226 Ohms vs. 0.043-0.0431 Ohms) and lower melting I²t values (17.19 vs. 26.24-27). Series 233 parts maintain closer electrical characteristics to the original 0233003.M. Both series meet the same electrical and mechanical requirements for 3A 125VAC 5x20mm cartridge fuses.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance status, whereas the original 0233003.M is RoHS non-compliant. This represents an improvement in environmental and regulatory compliance.

Q: Which substitute part has the best inventory availability?

A: The 0233003.MXP offers the highest inventory level at 3081 units in stock, followed by 0232003.MX125P at 1095 units and 0232003.MXF5125P at 1088 units.

Q: Do all substitutes require a fuse holder?

A: Yes. All parts, including the original 0233003.M and all substitutes, are cartridge-type fuses requiring a compatible 5x20mm fuse holder for installation.

Q: What certifications should I prioritize for my application?

A: The original 0233003.M carries CSA, K-MARK, METI, and UL certifications. Series 233 substitutes (0233003.MXP, 0233003.MXF4P, 0233003.MXBP) maintain CE, CSA, KC, PSE, and UL certifications. Series 232 substitutes carry CE, KC, and PSE certifications. Select based on your application's regulatory requirements.

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