GMC-3A Equivalent & Substitute Parts

Part Overview

The GMC-3A is a 3 A 250 V AC DC glass fuse cartridge manufactured by Eaton - Electronics Division. This component operates as a protective device in electrical circuits, requiring a dedicated fuse holder for installation. The 5mm x 20mm form factor is a standard industrial fuse package. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and performance characteristics to ensure direct functional replacement in circuit protection applications.

Key Parameters

Parameter	Specification
Current Rating	3 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-3A are qualified based on the following critical parameters:

Current Rating: 3 A (exact match required)
Voltage Rating - AC: 250 V (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Medium Blow (exact match required)
Breaking Capacity @ Rated Voltage: 100 A (exact match required)

All listed substitute parts meet these core electrical and mechanical specifications. Variations in secondary parameters such as melting I²t, DC cold resistance, and approval agencies do not prevent functional substitution when the primary parameters align. Parts are sourced from manufacturers including Eaton - Electronics Division, Littelfuse Inc., and OptiFuse, all maintaining active product status and ROHS3 compliance.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage Rating - AC (V)	Package / Case	Response Time	Breaking Capacity @ Rated Voltage (A)	Melting I²t	DC Cold Resistance (Ohms)	RoHS Status	Inventory (Pcs)
GMC-3A	Eaton - Electronics Division	3	250	5mm x 20mm	Medium Blow	100	19	0.026	ROHS3 Compliant	834
GMC-3-R	Eaton - Electronics Division	3	250	5mm x 20mm	Medium Blow	100	19	0.026	ROHS3 Compliant	919
BK/GMC-3-R	Eaton - Electronics Division	3	250	5mm x 20mm	Medium Blow	100	19	0.026	ROHS3 Compliant	1937
BK1/GMC-3-R	Eaton - Electronics Division	3	250	5mm x 20mm	Medium Blow	100	19	0.026	ROHS3 Compliant	1957
0232003.MXF19P	Littelfuse Inc.	3	250	5mm x 20mm	Medium Blow	100	17.19	0.0226	ROHS3 Compliant	757
0232003.MXF22P	Littelfuse	3	250	5mm x 20mm	Medium Blow	100	17.19	0.0226	ROHS3 Compliant	1143
0232003.MXF34P	Littelfuse Inc.	3	250	5mm x 20mm	Medium Blow	100	17.19	0.0226	ROHS3 Compliant	852
0232003.MXP	Littelfuse Inc.	3	250	5mm x 20mm	Medium Blow	100	17.19	0.0226	ROHS3 Compliant	8421
0234003.MXBP	Littelfuse Inc.	3	250	5mm x 20mm	Medium Blow	100	26.24	0.0431	ROHS3 Compliant	2124
0234003.MXP	Littelfuse Inc.	3	250	5mm x 20mm	Medium Blow	100	26.24	0.0431	ROHS3 Compliant	658
MSC-3A	OptiFuse	3	250	5mm x 20mm	Medium Blow	100	15.5	Not Specified	ROHS3 Compliant	4211

Engineering Selection Recommendations

All substitute parts listed maintain active product status and ROHS3 compliance, qualifying them for direct replacement in the GMC-3A application. Selection among equivalent parts should be based on the following factors:

Eaton - Electronics Division Parts (GMC-3-R, BK/GMC-3-R, BK1/GMC-3-R): These variants share identical electrical specifications and melting I²t characteristics with the GMC-3A. Approval agencies include CSA, KC-MARK, MITI, and UL. The BK1/GMC-3-R variant carries the highest inventory availability at 1957 pieces.

Littelfuse Inc. Series 232 Parts (0232003.MXF19P, 0232003.MXF22P, 0232003.MXF34P, 0232003.MXP): These parts operate across the extended temperature range of -55°C to 125°C and carry CE, KC, and PSE approvals. The 0232003.MXP variant offers the highest inventory level at 8421 pieces and maintains identical electrical performance across all Series 232 options.

Littelfuse Inc. Series 234 Parts (0234003.MXBP, 0234003.MXP): These parts feature a higher melting I²t value of 26.24 and increased DC cold resistance of 0.0431 Ohms. Approval agencies include CE, CSA, K-MARK, PSE, and UL. These characteristics indicate a slower thermal response profile compared to other substitutes.

OptiFuse MSC-3A: This part carries cULus and UL 248 approvals with a melting I²t of 15.5, representing the fastest thermal response among all listed substitutes. Operating temperature range extends from -55°C to 125°C.

Selection should prioritize parts with approval agencies matching the end-application requirements and inventory availability for supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the GMC-3A be directly replaced with any of the listed substitute parts?

A: Yes. All listed substitute parts match the critical electrical and mechanical parameters: 3 A current rating, 250 V AC voltage rating, 5mm x 20mm package dimensions, medium blow response time, and 100 A breaking capacity. Direct substitution is supported without circuit modification.

Q: What is the difference between Eaton GMC-3-R variants (GMC-3-R, BK/GMC-3-R, BK1/GMC-3-R)?

A: These variants are electrically and mechanically identical. Differences are limited to product designation and approval agency combinations. BK/GMC-3-R includes REACH Unaffected status. All three maintain the same melting I²t of 19 and DC cold resistance of 0.026 Ohms.

Q: Why do Littelfuse Series 232 and Series 234 parts have different melting I²t values?

A: Melting I²t is a secondary thermal characteristic that does not affect the primary substitution criteria. Series 232 parts (melting I²t 17.19) and Series 234 parts (melting I²t 26.24) both satisfy the 3 A, 250 V, 5mm x 20mm, medium blow, and 100 A breaking capacity requirements. Selection between series depends on application-specific thermal response requirements.

Q: What is the operating temperature range for each substitute?

A: Eaton GMC series parts do not specify an operating temperature range. Littelfuse Series 232 and 234 parts, and OptiFuse MSC-3A, all operate across -55°C to 125°C. Applications requiring extended temperature operation should specify Littelfuse or OptiFuse alternatives.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant status, meeting environmental and material restriction requirements.

Q: Which substitute part offers the highest inventory availability?

A: The Littelfuse 0232003.MXP offers the highest inventory level at 8421 pieces, followed by the Eaton BK1/GMC-3-R at 1957 pieces.

Q: Do all substitute parts require the same fuse holder as the GMC-3A?

A: Yes. All substitute parts are cartridge-type glass fuses with 5mm x 20mm dimensions and require a compatible fuse holder. No mechanical modifications are necessary for installation.

Q: What approval agencies are common across all substitute parts?

A: UL approval is present on Eaton variants and Littelfuse Series 234 parts. OptiFuse carries cULus and UL 248 approvals. For applications requiring specific regional certifications, refer to the approval agency column in the parameter comparison table.

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