GMD-500MA Equivalent & Substitute Parts Reference

Part Overview

The GMD-500MA is a 1.25 A 250 V AC/DC glass fuse cartridge manufactured by Eaton - Electronics Division. This slow-blow fuse cartridge operates in a 5mm x 20mm form factor and requires a compatible holder for installation. The part is currently in stock with 958 pieces available. Substitute parts are identified based on matching electrical ratings, mechanical dimensions, fuse type, and response characteristics to ensure direct functional equivalence in circuit protection applications.

Key Parameters

Parameter	Value
Manufacturer	Eaton - Electronics Division
Series	GMD
Current Rating	1.25 A
Voltage Rating - AC	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Slow Blow
Mounting Type	Requires Holder
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the GMD-500MA are grouped based on strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

Current Rating: 1.25 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: Slow Blow (exact match required)
Mounting Type: Requires Holder (exact match required)

All identified substitute parts meet these core parameters. Variations in Breaking Capacity, Melting I²t, DC Cold Resistance, and approval agencies are noted but do not disqualify substitution when the primary criteria are satisfied.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating	Voltage Rating - AC	Fuse Type	Package / Case	Response Time	Breaking Capacity @ Rated Voltage	Melting I²t	RoHS Status	Inventory
GMD-500MA	Eaton - Electronics Division	GMD	1.25 A	250 V	Cartridge, Glass	5mm x 20mm	Slow Blow	Not specified	Not specified	Not specified	958 Pcs
BK/GDC-1.25A	Eaton - Electronics Division	GDC	1.25 A	250 V	Cartridge, Glass	5mm x 20mm	Slow Blow	35 A	10.05	ROHS3 Compliant	1775 Pcs
BK/GMD-1.25-R	Eaton - Electronics Division	GMD	1.25 A	250 V	Cartridge, Glass	5mm x 20mm	Slow Blow	100 A	16	ROHS3 Compliant	1115 Pcs
BK/S506-1.25-R	Eaton - Electronics Division	S506	1.25 A	250 V	Cartridge, Glass	5mm x 20mm	Slow Blow	35 A	10.05	ROHS3 Compliant	2930 Pcs
BK1/GMD-1.25-R	Eaton - Electronics Division	GMD	1.25 A	250 V	Cartridge, Glass	5mm x 20mm	Slow Blow	100 A	16	ROHS3 Compliant	1859 Pcs
GDC-1.25A	Eaton - Electronics Division	GDC	1.25 A	250 V	Cartridge, Glass	5mm x 20mm	Slow Blow	35 A	10.05	Not specified	975 Pcs
GMD-1.25-R	Eaton - Electronics Division	GMD	1.25 A	250 V	Cartridge, Glass	5mm x 20mm	Slow Blow	100 A	16	ROHS3 Compliant	926 Pcs
S506-1.25-R	Eaton - Electronics Division	S506	1.25 A	250 V	Cartridge, Glass	5mm x 20mm	Slow Blow	35 A	10.05	ROHS3 Compliant	624 Pcs
0034.3118	SCHURTER Inc.	FST 5x20	1.25 A	250 V	Cartridge, Glass	5mm x 20mm	Slow Blow	35 A	5.5	ROHS3 Compliant	13782 Pcs
0034.3776	SCHURTER Inc.	FSL 5x20	1.25 A	250 V	Cartridge, Glass	5mm x 20mm	Slow Blow	100 A	1.54	ROHS3 Compliant	631 Pcs

Engineering Selection Recommendations

All identified substitute parts satisfy the core electrical and mechanical requirements for direct substitution with the GMD-500MA. Selection among available alternatives should be based on the following factors:

Eaton - Electronics Division Substitutes (Same Manufacturer):

BK/GDC-1.25A, BK/GMD-1.25-R, BK/S506-1.25-R, BK1/GMD-1.25-R, GDC-1.25A, GMD-1.25-R, and S506-1.25-R maintain manufacturer consistency and are all Active status products
Parts with ROHS3 Compliant designation are preferred for environmental compliance
Breaking Capacity variations (35 A vs. 100 A) and Melting I²t differences reflect design variations within the same electrical class; selection depends on specific circuit protection requirements

SCHURTER Inc. Substitutes (Alternative Manufacturer):

0034.3118 (FST 5x20 series) and 0034.3776 (FSL 5x20 series) provide cross-manufacturer alternatives
Both SCHURTER parts are ROHS3 Compliant and Active status
0034.3118 offers higher inventory availability (13782 pieces)
Operating temperature ranges differ: 0034.3118 operates -55°C to 125°C; 0034.3776 operates -40°C to 85°C

Approval Agency Considerations:

Eaton parts carry certifications including CSA, UL, PSE/JET, and cURus depending on series
SCHURTER 0034.3118 carries CCC, cURus, PSE/JET, and VDE certifications
SCHURTER 0034.3776 carries cULus certification
Selection should align with regional compliance requirements for the end application

Frequently Asked Questions (FAQ)

Q: Can GMD-500MA be directly replaced with any of the listed substitute parts?

A: Yes. All listed substitute parts match the critical electrical parameters (1.25 A, 250 V AC/DC), fuse type (Cartridge, Glass), response time (Slow Blow), and mechanical form factor (5mm x 20mm). Direct substitution is electrically and mechanically valid.

Q: What is the difference between parts with 35 A and 100 A Breaking Capacity?

A: Breaking Capacity indicates the maximum fault current the fuse can safely interrupt at rated voltage. Both ratings are valid for the 1.25 A fuse class. Selection depends on the specific circuit's maximum available fault current. Consult circuit design specifications to determine the appropriate Breaking Capacity requirement.

Q: Are SCHURTER parts (0034.3118 and 0034.3776) compatible with Eaton fuse holders?

A: Both SCHURTER parts use the identical 5mm x 20mm form factor and Cartridge, Glass type, making them mechanically compatible with standard 5x20mm fuse holders. Electrical compatibility is confirmed by matching current and voltage ratings.

Q: What does Melting I²t represent, and why do the values vary?

A: Melting I²t is a thermal characteristic indicating the energy required to melt the fuse element. Variations in this parameter (ranging from 1.54 to 16 in the substitute list) reflect different fuse element designs and response characteristics within the same 1.25 A rating class. Higher I²t values indicate slower thermal response; lower values indicate faster response. Selection should match the specific circuit protection profile required.

Q: Which substitute part offers the best inventory availability?

A: SCHURTER 0034.3118 (FST 5x20 series) has the highest inventory with 13782 pieces in stock, followed by BK/S506-1.25-R (Eaton) with 2930 pieces.

Q: Do all substitute parts comply with RoHS3?

A: All substitute parts listed carry ROHS3 Compliant designation except GDC-1.25A, for which RoHS status was not specified in the provided data.

Q: What approval agencies should I consider for regional compliance?

A: Eaton parts carry CSA, UL, PSE/JET, and cURus certifications depending on series. SCHURTER 0034.3118 carries CCC, cURus, PSE/JET, and VDE certifications. SCHURTER 0034.3776 carries cULus certification. Select based on your target market's regulatory requirements.

Q: Can I use GMD-500-R (500 mA) as a substitute for GMD-500MA (1.25 A)?

A: No. GMD-500-R has a different current rating (500 mA vs. 1.25 A) and is not electrically equivalent. Using an undersized fuse creates circuit protection failure risk.

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