GMA-1A Glass Cartridge Fuse 1A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The GMA-1A is a 1 A, 250 V AC/DC glass cartridge fuse manufactured by Eaton - Electronics Division. This fast-blow fuse cartridge requires a holder for installation and is designed for general-purpose circuit protection in 5mm x 20mm form factor applications. The part is active and available with 774 pieces in current inventory. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, fuse type, and response characteristics to ensure direct functional interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	1 A
Voltage Rating - AC	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	35A
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 GMA-1A are grouped based on strict equivalence of the following critical parameters:

Mandatory Matching Parameters:

Current Rating: 1 A
Voltage Rating - AC: 250 V
Fuse Type: Cartridge, Glass
Response Time: Fast Blow
Package / Case: 5mm x 20mm
Breaking Capacity @ Rated Voltage: 35A
Mounting Type: Requires Holder

All substitute parts listed maintain these electrical and mechanical specifications. Variations in secondary parameters such as melting I²t, DC cold resistance, and approval agencies do not affect functional interchangeability within the specified electrical and mechanical constraints. Parts are sourced from Eaton - Electronics Division, SCHURTER Inc., and Littelfuse Inc., all established manufacturers of cartridge fuses.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage Rating - AC (V)	Response Time	Package / Case	Breaking Capacity @ Rated Voltage (A)	Melting I²t	DC Cold Resistance (Ohms)	Inventory (Pcs)
GMA-1A	Eaton - Electronics Division	1	250	Fast Blow	5mm x 20mm	35	0.48	0.163	774
GMA-1-R	Eaton - Electronics Division	1	250	Fast Blow	5mm x 20mm	35	0.48	0.163	998
BK/GDB-1A	Eaton - Electronics Division	1	250	Fast Blow	5mm x 20mm	35	0.6	0.125	916
BK/S500-1-R	Eaton - Electronics Division	1	250	Fast Blow	5mm x 20mm	35	0.6	0.125	2112
BK1/S500-1-R	Eaton - Electronics Division	1	250	Fast Blow	5mm x 20mm	35	0.6	0.125	887
GDB-1A	Eaton - Electronics Division	1	250	Fast Blow	5mm x 20mm	35	0.6	0.125	773
S500-1-R	Eaton - Electronics Division	1	250	Fast Blow	5mm x 20mm	35	0.6	0.125	671
0034.1516	SCHURTER Inc.	1	250	Fast Blow	5mm x 20mm	35	1.13	Not Provided	3114
0034.3872	SCHURTER Inc.	1	250	Fast Blow	5mm x 20mm	35	0.68	Not Provided	1703
0217001.HXP	Littelfuse Inc.	1	250	Fast Blow	5mm x 20mm	35	1.045	0.0964	1800
0217001.MXBP	Littelfuse Inc.	1	250	Fast Blow	5mm x 20mm	35	1.045	0.0964	1862

Engineering Selection Recommendations

All listed substitute parts maintain identical electrical ratings (1 A, 250 V AC), fuse type (cartridge, glass), response characteristic (fast blow), and mechanical form factor (5mm x 20mm). Selection among these equivalents is based on the following criteria:

Eaton - Electronics Division Parts (GMA-1-R, BK/GDB-1A, BK/S500-1-R, BK1/S500-1-R, GDB-1A, S500-1-R): These parts are manufactured by the same original equipment manufacturer as the GMA-1A. All are active products with established approval certifications including UL, VDE, CSA, and PSE. The GMA-1-R variant offers the closest parametric match with identical melting I²t (0.48) and DC cold resistance (0.163 Ohms). The S500 series variants (BK/S500-1-R, BK1/S500-1-R, S500-1-R) provide the highest inventory availability (2112, 887, and 671 pieces respectively) and broader international approval coverage (BSI, CCC, CSA, cURus, IMQ, SEMKO, VDE).

SCHURTER Inc. Parts (0034.1516, 0034.3872): These parts are parametric equivalents with identical electrical and mechanical specifications. The 0034.1516 (FSF 5x20 series) offers the highest inventory level (3114 pieces) and extended operating temperature range (-55°C to 125°C). The 0034.3872 (FSK 5x20 series) provides an alternative with narrower operating temperature range (-40°C to 85°C) and different melting I²t (0.68).

Littelfuse Inc. Parts (0217001.HXP, 0217001.MXBP): These parts are parametric equivalents from the 217 series with comprehensive international approval coverage (BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE). Both variants offer extended operating temperature range (-55°C to 125°C) and lower DC cold resistance (0.0964 Ohms). Inventory availability is 1800 and 1862 pieces respectively.

Selection should prioritize product status (all listed parts are active), approval agency alignment with application requirements, and inventory availability for supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can GMA-1A be directly replaced with GMA-1-R?

A: Yes. Both parts are manufactured by Eaton - Electronics Division and share identical electrical ratings (1 A, 250 V AC), fuse type (cartridge, glass), response time (fast blow), and mechanical dimensions (5mm x 20mm). The GMA-1-R is a direct equivalent with matching melting I²t (0.48) and DC cold resistance (0.163 Ohms).

Q: What is the difference between Eaton GDB series and S500 series substitutes?

A: Both series meet the mandatory electrical and mechanical parameters for substitution. The GDB series (BK/GDB-1A, GDB-1A) has melting I²t of 0.6 and DC cold resistance of 0.125 Ohms. The S500 series (BK/S500-1-R, BK1/S500-1-R, S500-1-R) also has melting I²t of 0.6 and DC cold resistance of 0.125 Ohms. The S500 series variants provide broader international approval coverage (BSI, CCC, CSA, cURus, IMQ, SEMKO, VDE) compared to GDB variants.

Q: Are SCHURTER and Littelfuse parts compatible with the GMA-1A?

A: Yes. SCHURTER (0034.1516, 0034.3872) and Littelfuse (0217001.HXP, 0217001.MXBP) parts are parametric equivalents that maintain the same current rating (1 A), voltage rating (250 V AC), fuse type (cartridge, glass), response time (fast blow), and package dimensions (5mm x 20mm). These parts require the same holder type and provide equivalent circuit protection performance.

Q: What does "requires holder" mean for these fuse cartridges?

A: All listed parts are cartridge fuses that must be installed in a compatible fuse holder. The holder provides electrical contact and mechanical retention. The 5mm x 20mm form factor specifies the physical dimensions that determine holder compatibility. Ensure the fuse holder in your application is rated for 5mm x 20mm cartridge fuses.

Q: How do melting I²t and DC cold resistance affect substitution?

A: Melting I²t and DC cold resistance are secondary parameters that vary among the listed equivalents but do not prevent substitution. All parts maintain the same breaking capacity (35A) at rated voltage and the same fast-blow response characteristic. Variations in these parameters reflect different manufacturing designs but do not affect functional interchangeability within the specified electrical and mechanical constraints.

Q: Which substitute part has the best inventory availability?

A: SCHURTER 0034.1516 has the highest inventory with 3114 pieces in stock. Among Eaton parts, BK/S500-1-R offers the highest availability with 2112 pieces. Littelfuse 0217001.MXBP provides 1862 pieces.

Q: What approval agencies are most relevant for my application?

A: All listed parts carry multiple international approvals. Common certifications across most parts include UL, VDE, and CSA. The S500 series from Eaton and Littelfuse 217 series provide the broadest approval coverage including BSI, CCC, CSA, cURus, IMQ, SEMKO, and VDE. Verify that the selected part's approval agencies align with your specific application and regional requirements.

Q: Can I use these fuses in AC and DC circuits?

A: Yes. All listed parts are rated for 250 V AC. The specifications indicate AC/DC capability, meaning they are suitable for both alternating and direct current applications within the rated voltage and current limits.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message