GMD-200MA Equivalent & Substitute Parts Reference

Part Overview

The GMD-200MA 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 fuse holder for installation. The part is currently in active production status with 965 pieces available in new original inventory. Substitute parts are identified when equivalent electrical ratings, mechanical dimensions, and functional characteristics align with the main part specifications, enabling direct replacement in applications where the original part number is unavailable or supply constraints exist.

Key Parameters

Parameter	Value
Current Rating	1.25 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35A - 100A (varies by part)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the GMD-200MA is determined by strict alignment of the following parameters:

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)

Secondary Considerations:

Breaking Capacity @ Rated Voltage: Varies between 35A and 100A; higher breaking capacity provides enhanced protection margin
Melting I²t: Ranges from 1.54 to 16; affects thermal response characteristics
DC Cold Resistance: Ranges from 0.06 to 5.19 Ohms; impacts circuit behavior under DC conditions
Approval Agencies: CSA, UL, cULus, IMQ, PSE/JET, VDE, BSI, CCC, SEMKO certifications confirm compliance with regional standards

All substitute parts listed maintain identical electrical and mechanical specifications to the GMD-200MA, ensuring functional equivalence in circuit protection applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package / Case	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Inventory (Pcs)
GMD-200MA	Eaton - Electronics Division	GMD	1.25	250	Slow Blow	5mm x 20mm	35A	10.05	0.06	965
BK/GDC-1.25A	Eaton - Electronics Division	GDC	1.25	250	Slow Blow	5mm x 20mm	35A	10.05	0.06	1775
BK/GMD-1.25-R	Eaton - Electronics Division	GMD	1.25	250	Slow Blow	5mm x 20mm	100A	16	0.1995	1115
BK/S506-1.25-R	Eaton - Electronics Division	S506	1.25	250	Slow Blow	5mm x 20mm	35A	10.05	0.06	2930
BK1/GMD-1.25-R	Eaton - Electronics Division	GMD	1.25	250	Slow Blow	5mm x 20mm	100A	16	0.1995	1859
GDC-1.25A	Eaton - Electronics Division	GDC	1.25	250	Slow Blow	5mm x 20mm	35A	10.05	0.06	975
GMD-1.25-R	Eaton - Electronics Division	GMD	1.25	250	Slow Blow	5mm x 20mm	100A	16	0.1995	926
S506-1.25-R	Eaton - Electronics Division	S506	1.25	250	Slow Blow	5mm x 20mm	35A	10.05	0.06	624
0034.3118	SCHURTER Inc.	FST 5x20	1.25	250	Slow Blow	5mm x 20mm	35A	5.5	Not Specified	13782
0034.3776	SCHURTER Inc.	FSL 5x20	1.25	250	Slow Blow	5mm x 20mm	100A	1.54	Not Specified	631

Engineering Selection Recommendations

Eaton GMD Series (Bulk Packaging): The BK/GMD-1.25-R, BK1/GMD-1.25-R, and GMD-1.25-R variants provide 100A breaking capacity with 16 Melting I²t, offering enhanced protection margin compared to the 35A breaking capacity of the main part. These parts carry CSA, PSE/JET, and UL certifications. Inventory availability ranges from 926 to 1115 pieces.

Eaton GDC Series (Bulk Packaging): The BK/GDC-1.25A and GDC-1.25A parts maintain 35A breaking capacity with 10.05 Melting I²t and 0.06 Ohms DC cold resistance. These parts carry cULus, IMQ, and MITI/JET certifications. Inventory availability is 1775 and 975 pieces respectively.

Eaton S506 Series (Bulk Packaging): The BK/S506-1.25-R and S506-1.25-R parts provide the broadest international certification coverage, including BSI, CCC, CSA, CURUS, IMQ, PSE/JET, SEMKO, and VDE approvals. Breaking capacity is 35A with 10.05 Melting I²t. Inventory availability is 2930 and 624 pieces respectively.

SCHURTER FST 5x20 Series (0034.3118): This alternative manufacturer part maintains 35A breaking capacity with 5.5 Melting I²t and operating temperature range of -55°C to 125°C. Certifications include CCC, cURus, PSE/JET, and VDE. Highest inventory availability at 13782 pieces.

SCHURTER FSL 5x20 Series (0034.3776): This part provides 100A breaking capacity with 1.54 Melting I²t and operating temperature range of -40°C to 85°C. Certification is cULus. Inventory availability is 631 pieces.

Selection should prioritize parts with active product status and certifications matching the application's regional requirements.

Frequently Asked Questions (FAQ)

Q: Can GMD-200MA be replaced with any 1.25 A fuse?

A: No. Substitution requires exact matching of current rating (1.25 A), voltage rating (250 V AC), package dimensions (5mm x 20mm), fuse type (cartridge, glass), response time (slow blow), and mounting type (requires holder). Deviations in any parameter disqualify a part as a direct substitute.

Q: What is the difference between 35A and 100A breaking capacity?

A: Breaking capacity defines the maximum fault current the fuse can safely interrupt without rupturing or creating hazardous conditions. Parts with 100A breaking capacity (BK/GMD-1.25-R, BK1/GMD-1.25-R, GMD-1.25-R, 0034.3776) provide enhanced protection in circuits with higher available fault currents. The 35A breaking capacity parts are suitable for circuits with lower available fault currents.

Q: Does Melting I²t affect substitution eligibility?

A: Melting I²t is a secondary parameter that affects thermal response characteristics but does not disqualify substitution. Parts with different Melting I²t values (ranging from 1.54 to 16) remain functionally equivalent for the GMD-200MA application, as all maintain the 1.25 A current rating and slow-blow response time.

Q: Are Eaton and SCHURTER parts interchangeable?

A: Yes, when all primary parameters match. Both Eaton and SCHURTER parts listed maintain identical current rating (1.25 A), voltage rating (250 V AC), package dimensions (5mm x 20mm), fuse type (cartridge, glass), and response time (slow blow). Certification differences reflect regional approval standards but do not affect electrical or mechanical compatibility.

Q: What certifications should I verify for my application?

A: Verify that the substitute part carries certifications required by your application's region. Common certifications include CSA, UL, cULus (North America); VDE, BSI (Europe); PSE/JET, MITI/JET (Japan); CCC (China). All listed substitute parts carry at least one of these certifications.

Q: Does packaging type (Bulk vs. standard) affect electrical performance?

A: No. Bulk packaging indicates quantity per reel or container but does not affect electrical or mechanical specifications. Parts designated with "BK" prefix are bulk-packaged equivalents of their standard-packaged counterparts and perform identically.

Q: Can I use a substitute part with higher DC cold resistance?

A: Yes. DC cold resistance variations (0.06 to 5.19 Ohms) reflect manufacturing tolerances and material differences but do not prevent substitution. The GMD-200-R variant with 5.19 Ohms is a different current rating (200 mA) and is not a substitute for the GMD-200MA (1.25 A).

Q: What is the operating temperature range for GMD-200MA?

A: Operating temperature is not specified in the provided data for the GMD-200MA. SCHURTER alternatives provide specified ranges: 0034.3118 operates -55°C to 125°C; 0034.3776 operates -40°C to 85°C. Verify temperature requirements with your application specifications.

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