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

Part Overview

The Littelfuse 0232002.M is a 2 A, 250 V AC/DC glass cartridge fuse in 5mm x 20mm form factor, designed for circuits requiring medium-blow response protection. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. The fuse requires a holder for installation and operates across a temperature range of -55°C to 125°C. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and functional characteristics to ensure direct compatibility in existing applications.

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
Breaking Capacity @ Rated Voltage	100 A
Mounting Type	Requires Holder
Operating Temperature Range	-55°C to 125°C

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (2 A), voltage rating (250 V AC), fuse type (cartridge glass), physical dimensions (5mm x 20mm), response time (medium blow), and breaking capacity (100 A). All substitute parts listed maintain these core electrical and mechanical specifications. Variations in melting I²t values, DC cold resistance, and approval agencies are documented but do not disqualify substitution when the primary functional parameters remain identical. Parts are grouped by manufacturer and product status to facilitate selection based on availability and compliance requirements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Package / Case	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status	RoHS Status
0232002.M	Littelfuse Inc.	2	250	5mm x 20mm	Medium Blow	100	8.47	0.0385	Obsolete	RoHS non-compliant
0232002.MXF22P	Littelfuse Inc.	2	250	5mm x 20mm	Medium Blow	100	8.25	0.037	Active	ROHS3 Compliant
0232002.MXF34P	Littelfuse Inc.	2	250	5mm x 20mm	Medium Blow	100	8.25	0.037	Active	ROHS3 Compliant
0232002.MXF5P	Littelfuse Inc.	2	250	5mm x 20mm	Medium Blow	100	8.25	0.037	Active	ROHS3 Compliant
0232002.MXP	Littelfuse Inc.	2	250	5mm x 20mm	Medium Blow	100	8.25	0.037	Active	ROHS3 Compliant
0234002.MXBP	Littelfuse Inc.	2	250	5mm x 20mm	Medium Blow	100	9.97	0.0684	Active	ROHS3 Compliant
0234002.MXP	Littelfuse Inc.	2	250	5mm x 20mm	Medium Blow	100	9.97	0.0684	Active	ROHS3 Compliant
BK/GMC-2-R	Eaton - Electronics Division	2	250	5mm x 20mm	Medium Blow	100	8.9	0.043	Active	ROHS3 Compliant
BK1/GMC-2-R	Eaton - Electronics Division	2	250	5mm x 20mm	Medium Blow	100	8.9	0.043	Active	ROHS3 Compliant
GMC-2-R	Eaton - Electronics Division	2	250	5mm x 20mm	Medium Blow	100	8.9	0.043	Active	ROHS3 Compliant
MSC-2A	OptiFuse	2	250	5mm x 20mm	Medium Blow	100	4.888	Not specified	Active	ROHS3 Compliant

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete 0232002.M, the Littelfuse 0232002.MXP is the primary selection. This part maintains identical electrical and mechanical specifications while offering active product status and ROHS3 compliance. The 0232002.MXF22P and 0232002.MXF34P variants provide equivalent performance with comparable melting I²t characteristics and are suitable for new designs requiring RoHS compliance.

For designs requiring expanded approval agency coverage, the Littelfuse 0234002.MXP and 0234002.MXBP (Series 234) provide CE, CSA, K-MARK, PSE, and UL certifications. These parts exhibit higher melting I²t values (9.97 versus 8.25–8.47) and increased DC cold resistance, which may affect circuit behavior in applications with tight thermal or resistance tolerances.

The Eaton GMC series (BK/GMC-2-R, BK1/GMC-2-R, GMC-2-R) offers an alternative from a different manufacturer with CSA, KC-MARK, MITI, and UL approvals. These parts maintain the required electrical ratings and mechanical form factor.

The OptiFuse MSC-2A provides the lowest melting I²t value (4.888) among available substitutes, resulting in faster response characteristics. This part is suitable only for applications where faster fuse operation is acceptable or required.

Frequently Asked Questions (FAQ)

Q: Can 0232002.MXP directly replace the obsolete 0232002.M?

A: Yes. Both parts share identical current rating (2 A), voltage rating (250 V AC), package dimensions (5mm x 20mm), response time (medium blow), and breaking capacity (100 A). The primary difference is product status and RoHS compliance.

Q: What is the significance of melting I²t variation among substitute parts?

A: Melting I²t determines the thermal energy required to melt the fuse element. The 0232002.M has a melting I²t of 8.47, while most Littelfuse 232 series substitutes are 8.25, and 234 series parts are 9.97. Higher I²t values result in slower response to overcurrent conditions. Selection depends on circuit protection requirements.

Q: Are Eaton GMC-2-R fuses compatible with holders designed for Littelfuse 232 series?

A: Yes. All substitute parts maintain the 5mm x 20mm physical dimensions and cartridge glass form factor, ensuring mechanical compatibility with standard fuse holders.

Q: Which substitute part offers the best compliance coverage?

A: The Littelfuse 0234002.MXP and 0234002.MXBP provide the broadest approval agency coverage (CE, CSA, K-MARK, PSE, UL) and are ROHS3 compliant, making them suitable for international applications.

Q: Is the OptiFuse MSC-2A suitable as a general replacement?

A: The MSC-2A maintains all required electrical and mechanical specifications but exhibits significantly lower melting I²t (4.888 versus 8.25–9.97). Use this part only when faster fuse response is acceptable for the application.

Q: What packaging options are available for substitute parts?

A: All listed substitute parts are available in bulk packaging. The original 0232002.M was available in standard packaging; active substitutes offer bulk options for production environments.

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