GMC-100MA Glass Cartridge Fuse 100mA 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The GMC-100MA is a glass cartridge fuse manufactured by Eaton - Electronics Division, rated for 100 mA at 250 V AC/DC with a 5mm x 20mm form factor. This fuse requires a holder for installation and operates with medium blow response characteristics. The part is active in production with 1180 pieces in current inventory stock. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional performance parameters to ensure direct interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	100 mA
Voltage Rating - AC	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Medium Blow
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 GMC-100MA is determined by strict equivalence across the following parameters:

Primary Substitution Criteria:

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

All substitute parts listed meet these criteria. Secondary parameters including breaking capacity, melting I²t, approval agencies, and operating temperature ranges are provided for engineering reference but do not disqualify substitution when primary criteria are satisfied.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (Amps)	Voltage Rating - AC	Package / Case	Response Time	Breaking Capacity @ Rated Voltage	Melting I²t	Approval Agency	Operating Temperature	Inventory (Pcs)
GMC-100MA	Eaton - Electronics Division	100 mA	250 V	5mm x 20mm	Medium Blow	35A	0.0094	CSA, KC-MARK, UL	Not specified	1180
GMC-100-R	Eaton - Electronics Division	100 mA	250 V	5mm x 20mm	Medium Blow	35A	0.0094	CSA, KC-MARK, UL	Not specified	988
BK/GMC-100-R	Eaton - Electronics Division	100 mA	250 V	5mm x 20mm	Medium Blow	35A	0.0094	CSA, KC-MARK, UL	Not specified	785
BK1/GMC-100-R	Eaton - Electronics Division	100 mA	250 V	5mm x 20mm	Medium Blow	35A	0.0094	CSA, KC, MITI, UL	Not specified	672
20101000001	Littelfuse	100 mA	250 V	5mm x 20mm	Medium Blow	80A	0.022	cULus	-25°C ~ 70°C	855
20101000001P	Littelfuse Inc.	100 mA	250 V	5mm x 20mm	Medium Blow	80A	0.022	cULus	-25°C ~ 70°C	893
20101000021	Littelfuse Inc.	100 mA	250 V	5mm x 20mm	Medium Blow	80A	0.022	cULus	-25°C ~ 70°C	957
20101000021P	Littelfuse Inc.	100 mA	250 V	5mm x 20mm	Medium Blow	80A	0.022	cULus	-25°C ~ 70°C	1030
20101000301	Littelfuse Inc.	100 mA	250 V	5mm x 20mm	Medium Blow	80A	0.022	cULus	-25°C ~ 70°C	778
20101000301P	Littelfuse Inc.	100 mA	250 V	5mm x 20mm	Medium Blow	80A	0.022	cULus	-25°C ~ 70°C	896
MSC-100MA	OptiFuse	100 mA	250 V	5mm x 20mm	Medium Blow	100A	0.01227	cULus, UL 248	-55°C ~ 125°C	3700

Engineering Selection Recommendations

Eaton GMC Series (Direct Manufacturer Equivalents): GMC-100-R, BK/GMC-100-R, and BK1/GMC-100-R are direct equivalents manufactured by Eaton - Electronics Division. These parts share identical electrical specifications and mechanical dimensions with the GMC-100MA. All three variants carry active product status and hold CSA, KC-MARK, and UL certifications. Selection among these variants depends on packaging designation and regional compliance requirements. BK1/GMC-100-R includes MITI approval in addition to standard certifications.

Littelfuse 201 Series (Cross-Manufacturer Equivalents): The Littelfuse 201 series (20101000001, 20101000001P, 20101000021, 20101000021P, 20101000301, 20101000301P) provides parametric equivalence with higher breaking capacity (80A versus 35A) and higher melting I²t (0.022 versus 0.0094). These parts carry cULus certification and operate across -25°C to 70°C. The "P" designation indicates series 201P packaging. All variants are active products with substantial inventory availability.

OptiFuse MSC Series (Cross-Manufacturer Equivalent): MSC-100MA from OptiFuse meets all primary substitution criteria with the highest breaking capacity (100A) and widest operating temperature range (-55°C to 125°C). This part holds cULus and UL 248 certifications and is available in the largest inventory quantity (3700 pieces).

Selection should be based on application requirements for breaking capacity, operating temperature range, and regional certification needs. All listed parts are interchangeable for the specified 100 mA, 250 V AC/DC circuit protection function in 5mm x 20mm holder-based installations.

Frequently Asked Questions (FAQ)

Q: Can GMC-100-R be used as a direct replacement for GMC-100MA? A: Yes. GMC-100-R is a direct equivalent manufactured by the same company (Eaton - Electronics Division) with identical electrical ratings (100 mA, 250 V), mechanical dimensions (5mm x 20mm), and response characteristics (medium blow). Both require a holder for installation.

Q: What is the difference between Eaton GMC variants (GMC-100-R, BK/GMC-100-R, BK1/GMC-100-R)? A: All three Eaton variants share identical electrical and mechanical specifications. Differences exist in packaging designation and regional certifications. BK1/GMC-100-R includes MITI approval. Selection depends on packaging requirements and regional compliance standards.

Q: Can Littelfuse 201 series parts replace GMC-100MA? A: Yes, parametrically. All Littelfuse 201 series parts (20101000001, 20101000021, 20101000301 and their "P" variants) meet the primary substitution criteria: 100 mA current rating, 250 V AC voltage rating, 5mm x 20mm package, medium blow response, and holder-based mounting. Secondary differences include higher breaking capacity (80A) and higher melting I²t (0.022), which represent enhanced performance characteristics.

Q: What is the difference between Littelfuse parts with and without the "P" suffix? A: The "P" suffix indicates series 201P packaging designation. Both variants (with and without "P") share identical electrical specifications and performance parameters. Selection depends on packaging and inventory requirements.

Q: Is MSC-100MA from OptiFuse compatible with GMC-100MA applications? A: Yes. MSC-100MA meets all primary substitution criteria with 100 mA rating, 250 V AC voltage, 5mm x 20mm dimensions, and medium blow response. MSC-100MA offers higher breaking capacity (100A) and extended operating temperature range (-55°C to 125°C), representing enhanced performance for demanding applications.

Q: What holder type is required for these fuses? A: All listed parts require a 5mm x 20mm fuse holder. The fuses are cartridge-type glass fuses and cannot function without an appropriate holder assembly.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts carry RoHS3 compliance status as specified in the provided data.

Q: Which substitute part has the highest inventory availability? A: MSC-100MA from OptiFuse has the highest inventory with 3700 pieces in stock, followed by 20101000021P (Littelfuse) with 1030 pieces.

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