GMC-500MA Equivalent & Substitute Parts Reference

Part Overview

The GMC-500MA is a 500 mA glass cartridge fuse rated for 250 V AC/DC operation in a 5mm x 20mm form factor, manufactured by Eaton - Electronics Division. This fuse requires a compatible holder for installation and is classified as a medium-blow response cartridge fuse. The part is currently in active production status with 1039 pieces in stock inventory. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional performance characteristics within the 5x20mm glass cartridge fuse category.

Key Parameters

Parameter	Value
Current Rating	500 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-500MA is determined by strict equivalence across the following parameters:

Primary Substitution Criteria:

Current Rating: 500 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 below meet these criteria. Secondary parameters such as breaking capacity, melting I²t, DC cold resistance, and approval agencies may vary within acceptable engineering tolerances for the 5x20mm glass cartridge fuse category but do not disqualify substitution when primary criteria are satisfied.

Parameter Comparison

Part Number	Manufacturer	Current Rating (Amps)	Voltage Rating - AC	Package / Case	Response Time	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Inventory (Pcs)
GMC-500MA	Eaton - Electronics Division	500 mA	250 V	5mm x 20mm	Medium Blow	35A	0.41	0.335	1039
GMC-500-R	Eaton - Electronics Division	500 mA	250 V	5mm x 20mm	Medium Blow	35A	0.41	0.335	1175
BK/GMC-500-R	Eaton - Electronics Division	500 mA	250 V	5mm x 20mm	Medium Blow	35A	0.41	0.335	1692
BK1/GMC-500-R	Eaton - Electronics Division	500 mA	250 V	5mm x 20mm	Medium Blow	35A	0.41	0.335	1985
0034.2513	SCHURTER Inc.	500 mA	250 V	5mm x 20mm	Medium Blow	80A	0.675	Not Specified	911
20105000001	Littelfuse Inc.	500 mA	250 V	5mm x 20mm	Medium Blow	80A	0.35	Not Specified	2956
20105000001P	Littelfuse Inc.	500 mA	250 V	5mm x 20mm	Medium Blow	80A	0.35	Not Specified	760
20105000021	Littelfuse Inc.	500 mA	250 V	5mm x 20mm	Medium Blow	80A	0.35	Not Specified	1073
20105000021P	Littelfuse Inc.	500 mA	250 V	5mm x 20mm	Medium Blow	80A	0.35	Not Specified	868
20105000301	Littelfuse	500 mA	250 V	5mm x 20mm	Medium Blow	80A	0.35	Not Specified	988
20105000301P	Littelfuse Inc.	500 mA	250 V	5mm x 20mm	Medium Blow	80A	0.35	Not Specified	880

Engineering Selection Recommendations

Eaton GMC Series (Direct Manufacturer Equivalents): GMC-500-R, BK/GMC-500-R, and BK1/GMC-500-R are direct equivalents from Eaton - Electronics Division. These parts share identical electrical and mechanical specifications with the GMC-500MA, including breaking capacity (35A), melting I²t (0.41), and DC cold resistance (0.335 Ohms). All three variants are active production parts with CSA, KC-MARK, and UL approvals. BK1/GMC-500-R offers the highest inventory availability at 1985 pieces.

Littelfuse 201 Series (Parametric Equivalents): The Littelfuse 201 series (20105000001, 20105000001P, 20105000021, 20105000021P, 20105000301, 20105000301P) meets all primary substitution criteria. These parts feature higher breaking capacity (80A) and lower melting I²t (0.35) compared to the GMC-500MA. All Littelfuse variants carry cULus approval and are active production parts. The 20105000001 variant provides the largest inventory at 2956 pieces.

SCHURTER FSM 5x20 Series (Parametric Equivalent): The SCHURTER 0034.2513 meets primary substitution criteria with 500 mA current rating, 250 V AC voltage rating, and 5mm x 20mm package. This part features 80A breaking capacity and 0.675 melting I²t. Operating temperature range is specified as -40°C to 85°C. No approval agency is listed for this variant.

RoHS and Regulatory Compliance: All substitute parts are ROHS3 compliant. Littelfuse and SCHURTER variants include REACH Unaffected status. All parts are classified under ECCN EAR99 and HTSUS 8536.10.0020.

Frequently Asked Questions (FAQ)

Q: Can GMC-500-R be used as a direct replacement for GMC-500MA?

A: Yes. GMC-500-R is a direct equivalent from the same manufacturer (Eaton - Electronics Division) with identical electrical ratings (500 mA, 250 V AC), mechanical dimensions (5mm x 20mm), response time (medium blow), and performance characteristics (35A breaking capacity, 0.41 melting I²t, 0.335 Ohms DC cold resistance).

Q: What is the difference between Littelfuse 20105000001 and 20105000001P?

A: Both parts are electrically and mechanically identical with 500 mA current rating, 250 V AC voltage, 5mm x 20mm package, and medium blow response. The "P" designation indicates Series 201P packaging variant. Both are active production parts with cULus approval and identical performance specifications (80A breaking capacity, 0.35 melting I²t).

Q: Can SCHURTER 0034.2513 replace GMC-500MA in all applications?

A: SCHURTER 0034.2513 meets the primary substitution criteria: 500 mA current rating, 250 V AC voltage, 5mm x 20mm package, and medium blow response. However, it features different secondary parameters: 80A breaking capacity (versus 35A), 0.675 melting I²t (versus 0.41), and an extended operating temperature range of -40°C to 85°C. No approval agency is specified for this part.

Q: Are all substitute parts compatible with the same fuse holder as GMC-500MA?

A: Yes. All substitute parts are 5mm x 20mm cartridge fuses requiring a compatible holder. Mechanical dimensions are standardized at 0.205" diameter x 0.787" length (5.20mm x 20.00mm) across all listed equivalents.

Q: What is the difference between Littelfuse 20105000021 and 20105000301?

A: Both parts are electrically and mechanically identical with 500 mA current rating, 250 V AC voltage, 5mm x 20mm package, medium blow response, 80A breaking capacity, and 0.35 melting I²t. Both are Series 201P active production parts with cULus approval. Inventory levels differ: 20105000021 has 1073 pieces available, while 20105000301 has 988 pieces.

Q: Which substitute part offers the highest inventory availability?

A: Littelfuse 20105000001 provides the highest inventory with 2956 pieces in stock. This part meets all primary substitution criteria with 500 mA current rating, 250 V AC voltage, 5mm x 20mm package, and medium blow response.

Q: Do all substitute parts have the same approval certifications as GMC-500MA?

A: No. GMC-500MA carries CSA, KC-MARK, and UL approvals. Littelfuse variants carry cULus approval. SCHURTER 0034.2513 does not list an approval agency. Eaton variants (GMC-500-R, BK/GMC-500-R, BK1/GMC-500-R) carry CSA, KC-MARK, and UL approvals, with BK1/GMC-500-R also listing KC approval.

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