GMC-2A Equivalent & Substitute Parts

Part Overview

The GMC-2A is a 2 A 250 V AC/DC glass cartridge fuse manufactured by Eaton - Electronics Division. This fuse is designed for use in 5mm x 20mm fuse holders and provides medium-blow protection characteristics. The part is active in production with 690 pieces currently in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity for applications requiring 2 A 250 V AC/DC fuse cartridges with identical electrical and mechanical specifications.

Key Parameters

Parameter	Specification
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

Substitute parts for the GMC-2A are qualified based on the following critical parameters that must match or remain compatible:

Mandatory Matching Parameters:

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

All substitute parts listed maintain these core electrical and mechanical specifications, ensuring direct functional equivalence in applications designed for the GMC-2A. Variations in secondary parameters such as melting I²t, DC cold resistance, and operating temperature ranges do not affect substitutability within the defined electrical envelope.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Fuse Type	Package / Case	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Approval Agency	Inventory (Pcs)
GMC-2A	Eaton - Electronics Division	2	250	Cartridge, Glass	5mm x 20mm	Medium Blow	100	8.9	0.043	CSA, KC-MARK, MITI, UL	690
GMC-2-R	Eaton - Electronics Division	2	250	Cartridge, Glass	5mm x 20mm	Medium Blow	100	8.9	0.043	CSA, KC-MARK, MITI, UL	1775
BK/GMC-2-R	Eaton - Electronics Division	2	250	Cartridge, Glass	5mm x 20mm	Medium Blow	100	8.9	0.043	CSA, KC-MARK, MITI, UL	1565
BK1/GMC-2-R	Eaton - Electronics Division	2	250	Cartridge, Glass	5mm x 20mm	Medium Blow	100	8.9	0.043	CSA, KC, MITI, UL	1137
0232002.MXF22P	Littelfuse Inc.	2	250	Cartridge, Glass	5mm x 20mm	Medium Blow	100	8.25	0.037	CE, KC, PSE	1001
0232002.MXF34P	Littelfuse Inc.	2	250	Cartridge, Glass	5mm x 20mm	Medium Blow	100	8.25	0.037	CE, KC, PSE	1059
0232002.MXF5P	Littelfuse Inc.	2	250	Cartridge, Glass	5mm x 20mm	Medium Blow	100	8.25	0.037	CE, KC, PSE	787
0232002.MXP	Littelfuse Inc.	2	250	Cartridge, Glass	5mm x 20mm	Medium Blow	100	8.25	0.037	CE, KC, PSE	1967
0234002.MXBP	Littelfuse Inc.	2	250	Cartridge, Glass	5mm x 20mm	Medium Blow	100	9.97	0.0684	CE, CSA, K-MARK, PSE, UL	1749
0234002.MXP	Littelfuse Inc.	2	250	Cartridge, Glass	5mm x 20mm	Medium Blow	100	9.97	0.0684	CE, CSA, K-MARK, PSE, UL	2351
MSC-2A	OptiFuse	2	250	Cartridge, Glass	5mm x 20mm	Medium Blow	100	4.888	Not specified	cULus, UL 248	3495

Engineering Selection Recommendations

All listed substitute parts maintain electrical and mechanical compatibility with the GMC-2A within the defined 2 A 250 V AC/DC fuse cartridge specification. Selection among equivalent parts should be based on the following criteria:

Eaton GMC Series (GMC-2A, GMC-2-R, BK/GMC-2-R, BK1/GMC-2-R): These parts are direct manufacturer equivalents from Eaton - Electronics Division. All carry active product status and maintain identical melting I²t (8.9) and DC cold resistance (0.043 Ohms). Approval agencies include CSA, KC-MARK, MITI, and UL certifications. Selection among these variants is based on packaging designation and inventory availability.

Littelfuse 232 Series (0232002.MXF22P, 0232002.MXF34P, 0232002.MXF5P, 0232002.MXP): These parts are parametrically equivalent with melting I²t of 8.25 and DC cold resistance of 0.037 Ohms. Operating temperature range extends to -55°C ~ 125°C. Certifications include CE, KC, and PSE. These parts are suitable for applications requiring extended temperature performance.

Littelfuse 234 Series (0234002.MXBP, 0234002.MXP): These parts feature higher melting I²t (9.97) and DC cold resistance (0.0684 Ohms). Certifications include CE, CSA, K-MARK, PSE, and UL. Operating temperature range is -55°C ~ 125°C. These parts are suitable for applications requiring broader regulatory compliance.

OptiFuse MSC Series (MSC-2A): This part carries cULus and UL 248 certifications with operating temperature range of -55°C ~ 125°C. Melting I²t is 4.888. This part is suitable for applications requiring UL 248 compliance.

All parts are RoHS3 compliant and REACH unaffected. Product status is active for all listed equivalents.

Frequently Asked Questions (FAQ)

Q: Can GMC-2A be directly replaced with GMC-2-R, BK/GMC-2-R, or BK1/GMC-2-R?

A: Yes. These Eaton parts are direct manufacturer equivalents with identical electrical specifications (2 A, 250 V AC/DC), fuse type (Cartridge, Glass), package (5mm x 20mm), response time (Medium Blow), and breaking capacity (100 A). Differences in part number designation reflect packaging or distribution variants only.

Q: What is the difference between Eaton GMC series and Littelfuse 232 series fuses?

A: Both maintain identical electrical and mechanical specifications for the 2 A 250 V AC/DC application. Primary differences are: Littelfuse 232 series has lower DC cold resistance (0.037 Ohms vs. 0.043 Ohms), lower melting I²t (8.25 vs. 8.9), and extended operating temperature range (-55°C ~ 125°C). Certifications differ: Eaton includes MITI; Littelfuse includes CE and PSE.

Q: Are Littelfuse 234 series fuses (0234002.MXBP, 0234002.MXP) suitable replacements?

A: Yes. These parts meet all mandatory electrical and mechanical parameters. However, they feature higher melting I²t (9.97) and higher DC cold resistance (0.0684 Ohms) compared to GMC-2A (8.9 and 0.043 Ohms respectively). These characteristics may affect response behavior in specific circuit applications. Verify circuit design compatibility before substitution.

Q: What is the difference between 0232002.MXF22P, 0232002.MXF34P, 0232002.MXF5P, and 0232002.MXP?

A: All four Littelfuse 232 series parts are parametrically identical with respect to current rating (2 A), voltage (250 V AC), package (5mm x 20mm), melting I²t (8.25), and DC cold resistance (0.037 Ohms). Designations reflect different packaging or tape configurations. Electrical performance is equivalent.

Q: Can MSC-2A from OptiFuse be used as a direct substitute?

A: Yes. MSC-2A meets all mandatory electrical and mechanical specifications. However, melting I²t is significantly lower (4.888 vs. 8.9 for GMC-2A), indicating faster response to overcurrent conditions. Verify that circuit protection requirements are compatible with this faster response characteristic before substitution.

Q: What certifications should I verify for my application?

A: Certification requirements depend on end-use application and regional standards. GMC-2A carries CSA, KC-MARK, MITI, and UL certifications. Littelfuse 232 series carries CE, KC, and PSE. Littelfuse 234 series carries CE, CSA, K-MARK, PSE, and UL. OptiFuse MSC-2A carries cULus and UL 248. Confirm that the selected substitute part carries certifications required by your application standards.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant and REACH unaffected.

Q: What is the physical dimension compatibility?

A: All parts share identical physical dimensions: 0.205" Dia x 0.787" L (5.20mm x 20.00mm). All require a 5mm x 20mm fuse holder. Physical installation compatibility is assured across all listed parts.

Q: Does operating temperature range affect substitutability?

A: Operating temperature range does not affect electrical substitutability within the defined 2 A 250 V AC/DC specification. However, application environment must be considered. GMC-2A does not specify operating temperature limits. Littelfuse and OptiFuse parts specify -55°C ~ 125°C. For applications operating outside standard temperature ranges, select parts with specified temperature ratings.

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