GMC-2.5-R Equivalent & Substitute Parts

Part Overview

The GMC-2.5-R is a 2.5 A, 250 V AC/DC glass cartridge fuse manufactured by Eaton - Electronics Division. This medium-blow fuse operates in a 5mm x 20mm form factor and requires a compatible fuse holder for installation. The part is active in production with 723 units currently in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and application-specific requirements where alternative electrical or mechanical characteristics are acceptable within system design parameters.

Key Parameters

Parameter	Value
Current Rating	2.5 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
Series	GMC
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the GMC-2.5-R are classified into three categories based on electrical and mechanical compatibility:

Direct Equivalent (Same Manufacturer): BK/GMC-2.5-R shares identical electrical specifications, mechanical form factor, response time, and breaking capacity. This part is sourced from the same manufacturer (Eaton - Electronics Division) and represents a direct replacement with no performance variation.

Parametric Equivalents (Different Manufacturers, Matching Core Specifications): 023402.5MXP (Littelfuse Inc.) and MSC-2.5A (OptiFuse) match the critical electrical parameters: 2.5 A current rating, 250 V AC voltage rating, medium-blow response time, 5mm x 20mm package, and 100 A breaking capacity. These parts are functionally interchangeable within applications where the GMC-2.5-R is specified.

Similar Parts (Voltage or Response Time Variation): 021802.5HXP and 021802.5TXP (Littelfuse Inc., Series 218) operate at 2.5 A and 250 V but feature slow-blow response time and reduced breaking capacity (35 A). These parts are suitable for applications requiring slower response characteristics. 023302.5MXP (Littelfuse Inc., Series 233) operates at 2.5 A with medium-blow response but at reduced voltage rating (125 V AC), limiting its use to lower-voltage applications.

Substitution Criteria: All listed parts maintain the 5mm x 20mm mechanical form factor, 2.5 A current rating, and cartridge glass construction. Voltage rating, response time, breaking capacity, and melting I²t values determine application suitability and must be verified against circuit requirements before substitution.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Product Status
GMC-2.5-R	Eaton - Electronics Division	2.5	250	Medium Blow	5mm x 20mm	100	13	0.035	Active
BK/GMC-2.5-R	Eaton - Electronics Division	2.5	250	Medium Blow	5mm x 20mm	100	13	0.035	Active
023402.5MXP	Littelfuse Inc.	2.5	250	Medium Blow	5mm x 20mm	100	17.045	0.0521	Active
MSC-2.5A	OptiFuse	2.5	250	Medium Blow	5mm x 20mm	100	10.49	Not Provided	Active
021802.5HXP	Littelfuse	2.5	250	Slow Blow	5mm x 20mm	35	23.25	0.0219	Active
021802.5TXP	Littelfuse Inc.	2.5	250	Slow Blow	5mm x 20mm	35	23.25	0.0219	Active
023302.5MXP	Littelfuse Inc.	2.5	125	Medium Blow	5mm x 20mm	10000	17.045	0.0521	Active

Engineering Selection Recommendations

Primary Substitutes (Full Compatibility): BK/GMC-2.5-R, 023402.5MXP, and MSC-2.5A are direct functional equivalents to GMC-2.5-R. All three parts maintain identical current rating, voltage rating, response time classification, mechanical form factor, and breaking capacity. Selection among these three is based on availability and procurement lead time. All parts carry active product status and meet RoHS3 compliance requirements.

Secondary Substitutes (Application-Dependent): 021802.5HXP and 021802.5TXP are suitable for applications requiring slow-blow response characteristics. These parts operate at the same 2.5 A and 250 V specifications but feature reduced breaking capacity (35 A versus 100 A) and higher melting I²t values (23.25 versus 13). Use these parts only when circuit design specifically requires slow-blow protection and can tolerate the lower breaking capacity rating.

Voltage-Reduced Substitute (Limited Scope): 023302.5MXP operates at 125 V AC and is suitable only for applications operating at or below 125 V. This part is not interchangeable with GMC-2.5-R in 250 V circuits.

Compliance Verification: All listed parts carry UL approval. GMC-2.5-R, BK/GMC-2.5-R, 023402.5MXP, and MSC-2.5A are approved for 250 V AC operation. Verify that selected substitute meets all required agency certifications (CSA, KC-MARK, MITI, UL, or equivalent) for the target application before final selection.

Frequently Asked Questions (FAQ)

Q: Can BK/GMC-2.5-R be used as a direct replacement for GMC-2.5-R?

A: Yes. BK/GMC-2.5-R is manufactured by Eaton - Electronics Division and shares identical electrical specifications, response time, breaking capacity, and mechanical form factor with GMC-2.5-R. No circuit modification is required.

Q: What is the difference between GMC-2.5-R and 023402.5MXP?

A: Both parts operate at 2.5 A, 250 V AC, medium-blow response, and 100 A breaking capacity in a 5mm x 20mm package. The primary differences are manufacturer (Eaton versus Littelfuse) and melting I²t value (13 versus 17.045). The higher I²t value in 023402.5MXP indicates slightly slower thermal response. Both are functionally equivalent for standard circuit protection applications.

Q: Can 021802.5HXP replace GMC-2.5-R?

A: 021802.5HXP is mechanically and electrically compatible at 2.5 A and 250 V but features slow-blow response instead of medium-blow. This part is suitable only for applications where slow-blow protection is required. The reduced breaking capacity (35 A versus 100 A) must also be verified against circuit requirements.

Q: Why is 023302.5MXP listed as a substitute if it operates at 125 V?

A: 023302.5MXP is listed as a similar part but is not a direct substitute for 250 V applications. It is suitable only for circuits operating at 125 V AC or lower. Use this part only when application voltage is confirmed to be 125 V or less.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed parts carry RoHS3 compliance status. Verify REACH status for specific regulatory requirements; most parts listed are REACH Unaffected or carry equivalent compliance documentation.

Q: What is the significance of melting I²t values in fuse selection?

A: Melting I²t indicates the thermal energy required to melt the fuse element. Lower I²t values (GMC-2.5-R at 13) indicate faster response to overcurrent. Higher I²t values (021802.5HXP at 23.25) indicate slower response. Selection must match circuit protection requirements and load characteristics.

Q: Can MSC-2.5A be used in all applications where GMC-2.5-R is specified?

A: MSC-2.5A matches GMC-2.5-R in current rating, voltage rating, response time, package, and breaking capacity. Verify that OptiFuse approval certifications (cULus, UL 248) meet application requirements. MSC-2.5A is suitable for standard 250 V AC/DC circuits requiring 2.5 A medium-blow protection.

Q: What is the mechanical compatibility of all listed parts?

A: All listed parts use the 5mm x 20mm cartridge form factor and require a compatible fuse holder. No mechanical modification is necessary when substituting between parts in this list. Verify that the fuse holder is rated for the selected part's voltage and current specifications.

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