GMC-3.15A Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The GMC-3.15A is a 3.15 A 250 V AC/DC glass cartridge fuse manufactured by Eaton - Electronics Division. This component is a passive protective device designed for circuit protection in industrial and commercial applications. The fuse operates at medium blow response time and requires a compatible holder for installation. The part is currently in active production status with 730 pieces available in new original stock. Equivalent and substitute parts are identified to support procurement flexibility, supply chain continuity, and application-specific compliance requirements.

Key Parameters

Parameter	Value
Current Rating	3.15 A
Voltage Rating - AC	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Medium Blow
Breaking Capacity @ Rated Voltage	100A
Mounting Type	Requires Holder
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the GMC-3.15A is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Current Rating: 3.15 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: 100A (exact match required)
Mounting Type: Requires Holder (exact match required)

All substitute parts listed meet these mandatory criteria. Variations in secondary parameters such as melting I²t, DC cold resistance, operating temperature range, and approval agencies do not disqualify substitution but may influence selection based on specific application requirements and regional compliance needs.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating - AC (V)	Package / Case	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Approval Agency	Inventory (Pcs)
GMC-3.15A	Eaton - Electronics Division	3.15	250	5mm x 20mm	Medium Blow	100	23	0.025	CSA, KC-MARK, MITI, UL	730
GMC-3.15-R	Eaton - Electronics Division	3.15	250	5mm x 20mm	Medium Blow	100	23	0.025	CSA, KC-MARK, MITI, UL	1034
BK/GMC-3.15-R	Eaton - Electronics Division	3.15	250	5mm x 20mm	Medium Blow	100	23	0.025	CSA, KC-MARK, MITI, UL	1362
BK1/GMC-3.15-R	Eaton - Electronics Division	3.15	250	5mm x 20mm	Medium Blow	100	23	0.025	CSA, KC, MITI, UL	819
02323.15MXP	Littelfuse Inc.	3.15	250	5mm x 20mm	Medium Blow	100	21.95	0.0215	CE, KC, PSE	840
02343.15MXBP	Littelfuse Inc.	3.15	250	5mm x 20mm	Medium Blow	100	29.795	0.038	CE, CSA, K-MARK, PSE, UL	739
02343.15MXF34P	Littelfuse Inc.	3.15	250	5mm x 20mm	Medium Blow	100	29.795	0.038	CE, CSA, K-MARK, PSE, UL	1053
02343.15MXGP	Littelfuse Inc.	3.15	250	5mm x 20mm	Medium Blow	100	29.795	0.038	CE, CSA, K-MARK, PSE, UL	1140
02343.15MXP	Littelfuse Inc.	3.15	250	5mm x 20mm	Medium Blow	100	29.795	0.038	CE, CSA, K-MARK, PSE, UL	1833
MSC-3.15A	OptiFuse	3.15	250	5mm x 20mm	Medium Blow	100	17.41	Not specified	cULus, UL 248	6633

Engineering Selection Recommendations

Eaton GMC Series (GMC-3.15A, GMC-3.15-R, BK/GMC-3.15-R, BK1/GMC-3.15-R): These parts are direct manufacturer equivalents from Eaton - Electronics Division. All variants maintain identical electrical specifications with melting I²t of 23 and DC cold resistance of 0.025 Ohms. Approval agencies include CSA, KC-MARK, MITI, and UL certifications. Selection among these variants is based on packaging designation and regional availability. BK/GMC-3.15-R offers the highest inventory level (1362 pcs) among Eaton variants.

Littelfuse 232 Series (02323.15MXP): This part provides parametric equivalence with slightly lower melting I²t (21.95 versus 23) and DC cold resistance (0.0215 Ohms). Approval agencies include CE, KC, and PSE. Operating temperature range extends to -55°C ~ 125°C. This variant is suitable for applications requiring European and Asian market compliance.

Littelfuse 234 Series (02343.15MXBP, 02343.15MXF34P, 02343.15MXGP, 02343.15MXP): These four part numbers represent variants within the Littelfuse 234 series. All maintain identical electrical specifications with melting I²t of 29.795 and DC cold resistance of 0.038 Ohms. Approval agencies include CE, CSA, K-MARK, PSE, and UL. Operating temperature range is -55°C ~ 125°C. The 02343.15MXP variant offers the highest inventory (1833 pcs) within this series.

OptiFuse MSC Series (MSC-3.15A): This part provides parametric equivalence with the lowest melting I²t (17.41) among all substitutes. Approval agencies include cULus and UL 248. Operating temperature range is -55°C ~ 125°C. This variant offers the highest total inventory availability (6633 pcs) across all substitute options.

Selection Basis:

For North American applications prioritizing UL compliance: Eaton GMC series or Littelfuse 234 series
For European market applications: Littelfuse 232 or 234 series with CE certification
For maximum inventory availability: OptiFuse MSC-3.15A
For applications requiring extended temperature range: Littelfuse or OptiFuse variants (-55°C ~ 125°C)

Frequently Asked Questions (FAQ)

Q: Can GMC-3.15A be directly replaced with any of the listed substitute parts?

A: Yes. All listed substitute parts meet the mandatory equivalence criteria: 3.15 A current rating, 250 V AC voltage rating, 5mm x 20mm package, medium blow response time, and 100A breaking capacity. Direct mechanical and electrical substitution is supported without circuit modification.

Q: What is the significance of different melting I²t values among substitutes?

A: Melting I²t represents the thermal energy required to melt the fuse element. Variations (ranging from 17.41 to 29.795 in the substitute list) reflect different fuse element designs. All values are within acceptable parameters for the 3.15 A 250 V rating class. Selection should align with the original equipment manufacturer's design specifications if available.

Q: Are there regional compliance differences among the substitute parts?

A: Yes. Eaton GMC variants include MITI certification (Japan market). Littelfuse 232 and 234 series include CE certification (European market). OptiFuse MSC-3.15A includes cULus certification (North American market). Selection should match the target market's regulatory requirements.

Q: Does DC cold resistance variation affect substitution suitability?

A: DC cold resistance values range from 0.0215 to 0.038 Ohms across substitutes. These variations are within acceptable tolerance for the 3.15 A cartridge fuse class and do not disqualify substitution. However, applications with specific impedance requirements should verify compatibility with the original design.

Q: What is the difference between GMC-3.15A and GMC-3.15-R?

A: Both parts are manufactured by Eaton and maintain identical electrical specifications. The designation difference reflects packaging or distribution channel variation. GMC-3.15-R is available in higher inventory (1034 pcs versus 730 pcs for GMC-3.15A).

Q: Can I use MSC-3.15A in place of GMC-3.15A in all applications?

A: MSC-3.15A meets all mandatory electrical and mechanical equivalence criteria. However, verify that the original equipment design does not specify Eaton as a required manufacturer. If the application requires specific manufacturer certification or approval, confirm MSC-3.15A meets those requirements.

Q: What holder type is required for these 5mm x 20mm cartridge fuses?

A: All listed parts require a compatible 5mm x 20mm fuse holder. Verify that the existing holder in your application is rated for 250 V AC and 3.15 A minimum. Holder compatibility is independent of fuse manufacturer.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, meeting environmental and hazardous substance restrictions for electronic components.

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