Littelfuse 0232001.M Glass Cartridge Fuse 1A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0232001.M is a 1 A, 250 V AC/DC glass cartridge fuse with a 5mm x 20mm form factor, designed for use in fuse holders. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for ongoing design and procurement requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within the same application category.

Key Parameters

Parameter	Value
Current Rating	1 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Medium Blow
Breaking Capacity @ Rated Voltage	100A
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 (1 A), voltage rating (250 V AC), fuse type (cartridge glass), physical package (5mm x 20mm), response time (medium blow), and operating temperature range (-55°C ~ 125°C). All identified substitutes maintain these core electrical and mechanical specifications.

The substitute parts are grouped into two categories:

Littelfuse Series 232 and 234 (Active Status): Parts 0232001.MXF15P, 0232001.MXF34P, 0232001.MXF5P, 0232001.MXP, 0234001.MXBP, and 0234001.MXP are active production components from Littelfuse with identical current and voltage ratings. These parts differ in melting I²t values and DC cold resistance, which reflect manufacturing variations within the same functional class.

Eaton GMC Series (Active Status): Parts BK/GMC-1-R, BK1/GMC-1-R, and GMC-1-R are active Eaton products meeting the same electrical specifications. These parts have a lower breaking capacity (35A versus 100A) compared to Littelfuse equivalents.

OptiFuse MSC Series (Active Status): Part MSC-1A is an active OptiFuse product with identical electrical specifications and a higher melting I²t value (2.112).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status	RoHS Status
0232001.M	Littelfuse Inc.	232	1	250	Medium Blow	5x20mm	100	1.41	0.0957	Obsolete	RoHS non-compliant
0232001.MXF15P	Littelfuse Inc.	232	1	250	Medium Blow	5x20mm	100	1.373	0.0923	Active	ROHS3 Compliant
0232001.MXF34P	Littelfuse Inc.	232	1	250	Medium Blow	5x20mm	100	1.373	0.0923	Active	ROHS3 Compliant
0232001.MXF5P	Littelfuse Inc.	232	1	250	Medium Blow	5x20mm	100	1.373	0.0923	Active	ROHS3 Compliant
0232001.MXP	Littelfuse Inc.	232	1	250	Medium Blow	5x20mm	100	1.373	0.0923	Active	ROHS3 Compliant
0234001.MXBP	Littelfuse Inc.	234	1	250	Medium Blow	5x20mm	100	1.975	0.175	Active	ROHS3 Compliant
0234001.MXP	Littelfuse Inc.	234	1	250	Medium Blow	5x20mm	100	1.975	0.175	Active	ROHS3 Compliant
BK/GMC-1-R	Eaton - Electronics Division	GMC	1	250	Medium Blow	5x20mm	35	1.8	0.156	Active	ROHS3 Compliant
BK1/GMC-1-R	Eaton - Electronics Division	GMC	1	250	Medium Blow	5x20mm	35	1.8	0.156	Active	ROHS3 Compliant
GMC-1-R	Eaton - Electronics Division	GMC	1	250	Medium Blow	5x20mm	35	1.8	0.156	Active	ROHS3 Compliant
MSC-1A	OptiFuse	MSC	1	250	Medium Blow	5x20mm	100	2.112	Not specified	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Littelfuse Series 232 Active Parts): Parts 0232001.MXF15P, 0232001.MXF34P, 0232001.MXF5P, and 0232001.MXP are direct active replacements from the original manufacturer. All are ROHS3 compliant and maintain 100A breaking capacity. These parts are preferred for applications requiring manufacturer continuity and regulatory compliance.

Secondary Substitutes (Littelfuse Series 234): Parts 0234001.MXBP and 0234001.MXP are active Littelfuse alternatives with higher melting I²t values (1.975) and increased DC cold resistance (0.175 Ω). These parts carry expanded approval certifications (CE, CSA, K-MARK, PSE, UL) and are suitable for applications requiring broader regulatory acceptance.

Alternative Manufacturer Options (Eaton GMC Series): Parts BK/GMC-1-R, BK1/GMC-1-R, and GMC-1-R are active Eaton products with identical electrical specifications but reduced breaking capacity (35A). These parts are ROHS3 compliant and carry CSA, KC, and UL certifications. Selection of Eaton parts is appropriate when multi-source procurement is required or when application breaking capacity requirements do not exceed 35A.

Alternative Manufacturer Option (OptiFuse MSC Series): Part MSC-1A is an active OptiFuse product with identical electrical specifications and the highest melting I²t value (2.112). This part carries cULus and UL 248 certifications and is suitable for applications requiring OptiFuse sourcing or specific thermal characteristics.

Frequently Asked Questions (FAQ)

Q: Can all listed substitute parts be used interchangeably with the 0232001.M?

A: All substitute parts maintain identical current rating (1 A), voltage rating (250 V AC), fuse type (cartridge glass), physical package (5mm x 20mm), response time (medium blow), and operating temperature range (-55°C ~ 125°C). Substitution is electrically and mechanically valid. Differences in breaking capacity, melting I²t, and DC cold resistance reflect manufacturing variations within the same functional class and do not affect basic fuse operation in standard applications.

Q: What is the significance of breaking capacity differences between Littelfuse and Eaton parts?

A: Breaking capacity is the maximum fault current the fuse can safely interrupt at rated voltage. Littelfuse Series 232, 234, and OptiFuse MSC parts have 100A breaking capacity. Eaton GMC series parts have 35A breaking capacity. Selection depends on the maximum prospective fault current in the application circuit. If fault current does not exceed 35A, Eaton parts are suitable. If fault current may exceed 35A, Littelfuse or OptiFuse parts are required.

Q: What does melting I²t indicate?

A: Melting I²t is a thermal characteristic indicating the energy required to melt the fuse element. The original 0232001.M has a melting I²t of 1.41. Littelfuse Series 232 active parts have 1.373, Series 234 parts have 1.975, Eaton GMC parts have 1.8, and OptiFuse MSC-1A has 2.112. These variations reflect different fuse element designs and thermal response characteristics. Selection should be based on application thermal requirements and coordination with circuit protection schemes.

Q: Are all substitute parts RoHS compliant?

A: The original 0232001.M is RoHS non-compliant. All active substitute parts listed are ROHS3 compliant, meeting current environmental regulations. This compliance is a key advantage of transitioning from the obsolete 0232001.M to any of the active alternatives.

Q: What certifications should I consider for regulatory compliance?

A: The original 0232001.M carries only METI approval. Littelfuse Series 232 active parts carry CE, KC, and PSE certifications. Littelfuse Series 234 parts carry CE, CSA, K-MARK, PSE, and UL certifications. Eaton GMC parts carry CSA, KC-MARK, and UL certifications. OptiFuse MSC-1A carries cULus and UL 248 certifications. Selection should align with the regulatory requirements of the target market and application.

Q: Can I use Eaton GMC parts in applications previously using Littelfuse 0232001.M?

A: Eaton GMC parts are electrically and mechanically equivalent for standard fuse operation. However, the reduced breaking capacity (35A versus 100A) must be evaluated against the application's maximum prospective fault current. If fault current may exceed 35A, Eaton parts are not suitable. If fault current is confirmed to remain below 35A, Eaton parts provide a valid alternative with established UL and CSA certifications.

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