Littelfuse 0234002.M Glass Cartridge Fuse 2A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0234002.M is a 2 A 250 V AC/DC glass cartridge fuse with a 5mm x 20mm form factor, designed for applications requiring medium-blow response characteristics. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for direct replacement in existing designs and new production 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
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)

Substitute Part Grouping Explanation

Substitution eligibility for the 0234002.M is determined by strict equivalence across the following critical parameters:

Current Rating: 2 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Response Time: Medium Blow (exact match required)
Breaking Capacity @ Rated Voltage: 100 A (exact match required)
Mounting Type: Requires Holder (exact match required)

All substitute parts listed below meet these mandatory criteria. Variations in secondary parameters such as melting I²t, DC cold resistance, approval agencies, and RoHS compliance status do not disqualify substitution but are documented for design consideration.

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 (Ohms)	Product Status	RoHS Status
0234002.M	Littelfuse Inc.	2	250	5mm x 20mm	Medium Blow	100	10.2	0.068	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

All listed substitute parts are active products with current manufacturing status, eliminating obsolescence risk associated with the 0234002.M. Selection among equivalents should prioritize the following criteria:

Littelfuse Series 232 and 234 variants (0232002.MXF22P, 0232002.MXF34P, 0232002.MXF5P, 0232002.MXP, 0234002.MXBP, 0234002.MXP): These parts maintain Littelfuse manufacturing continuity and carry ROHS3 compliance certification. The Series 234 variants (0234002.MXBP, 0234002.MXP) exhibit melting I²t values closest to the original 0234002.M specification (9.97 versus 10.2), providing the most direct thermal performance match.

Eaton GMC Series (BK/GMC-2-R, BK1/GMC-2-R, GMC-2-R): These alternatives offer active product status with established supply chains. All three variants are electrically and mechanically equivalent, with GMC-2-R representing the base designation.

OptiFuse MSC-2A: This part meets all mandatory substitution criteria and carries ROHS3 compliance. The significantly lower melting I²t value (4.888) indicates faster thermal response compared to the original specification and should be evaluated against application-specific thermal requirements.

All substitute parts carry appropriate regulatory approvals (UL, CSA, CE, or equivalent) suitable for their respective application regions.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for the 0234002.M?

A: Yes. All listed parts meet the mandatory electrical and mechanical equivalence criteria: 2 A current rating, 250 V AC voltage rating, 5mm x 20mm package, medium-blow response, and 100 A breaking capacity. Physical form factor and holder compatibility are identical.

Q: What is the significance of the different melting I²t values shown in the comparison table?

A: Melting I²t defines the thermal energy required to melt the fuse element. The original 0234002.M specifies 10.2. Littelfuse Series 234 variants (0234002.MXBP, 0234002.MXP) at 9.97 provide the closest match. Eaton GMC variants at 8.9 and OptiFuse MSC-2A at 4.888 represent faster thermal response. Selection depends on whether your application requires thermal performance matching the original specification or can tolerate faster response characteristics.

Q: Are there any compliance differences I should consider?

A: The original 0234002.M is RoHS non-compliant. All active substitutes are ROHS3 compliant. If your application or supply chain requires RoHS compliance, any of the listed alternatives satisfies this requirement. Approval agencies vary by manufacturer: Littelfuse parts carry UL, CSA, and K-MARK certifications; Eaton GMC parts carry UL, CSA, and MITI certifications; OptiFuse MSC-2A carries cULus and UL 248 certifications.

Q: Do all these parts use the same fuse holder?

A: Yes. All parts are 5mm x 20mm glass cartridge fuses requiring a standard holder. Physical dimensions are identical across all substitutes.

Q: Which substitute should I choose for new designs?

A: For new designs, prioritize active products with established supply availability. Littelfuse Series 234 variants (0234002.MXBP, 0234002.MXP) provide the closest thermal performance match to the original. Eaton GMC-2-R and OptiFuse MSC-2A are equally valid alternatives if your application can accommodate their respective thermal response characteristics or if supply or cost considerations favor these manufacturers.

Q: What is the difference between the Littelfuse 0232002 and 0234002 series?

A: Both series meet identical electrical and mechanical specifications for this 2 A 250 V application. The series designation reflects internal Littelfuse product line organization. From a substitution perspective, they are functionally equivalent. The 0234002 series exhibits melting I²t values closer to the original 0234002.M specification.

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