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

Part Overview

The GMA-1-R is a 1 A, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Eaton - Electronics Division in a 5mm x 20mm package format. This fuse requires a holder for installation and is designed for general-purpose circuit protection applications. The part maintains Active product status with ROHS3 compliance and multiple international approvals including CSA, PSE, and UL certification.

Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across the same package format, current rating, voltage rating, and response time characteristics. Alternative sources and series variants provide equivalent functional performance for circuit protection applications requiring 1 A protection at 250 V AC/DC.

Key Parameters

Parameter	Value
Current Rating	1 A
Voltage Rating - AC	250 V
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35A
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the GMA-1-R are classified based on strict equivalence of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Current Rating: 1 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: Fast Blow (exact match required)
Mounting Type: Requires Holder (exact match required)

All substitute parts listed maintain these core parameters. Variations in secondary characteristics such as melting I²t, DC cold resistance, breaking capacity, and approval agencies are documented but do not disqualify substitution when primary parameters align. Parts are sourced from manufacturers including Eaton - Electronics Division, Littelfuse Inc., and SCHURTER Inc., each offering equivalent functional performance within the specified electrical and mechanical envelope.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (A)	Voltage Rating - AC (V)	Package / Case	Response Time	Breaking Capacity @ Rated Voltage (A)	Melting I²t	DC Cold Resistance (Ohms)	Approval Agency
GMA-1-R	Eaton - Electronics Division	GMA	1	250	5mm x 20mm	Fast Blow	35	0.48	0.163	CSA, PSE, UL
BK/GMA-1-R	Eaton - Electronics Division	GMA	1	250	5mm x 20mm	Fast Blow	35	0.48	0.163	CSA, PSE, UL
BK/GDB-1A	Eaton - Electronics Division	GDB	1	250	5mm x 20mm	Fast Blow	35	0.6	0.125	UL, VDE
BK/S500-1-R	Eaton - Electronics Division	S500	1	250	5mm x 20mm	Fast Blow	35	0.6	0.125	BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE
0034.3872	SCHURTER Inc.	FSK 5x20	1	250	5mm x 20mm	Fast Blow	35	0.68	Not Specified	cULus
0235001.HXP	Littelfuse	235	1	250	5mm x 20mm	Fast Blow	100	0.4675	0.153	CE, CSA, KC, PSE, UL
0235001.MXP	Littelfuse Inc.	235	1	250	5mm x 20mm	Fast Blow	100	0.4675	0.153	CE, CSA, KC, PSE, UL
0034.1516	SCHURTER Inc.	FSF 5x20	1	250	5mm x 20mm	Fast Blow	35	1.13	Not Specified	CCC, cURus, PSE/JET, VDE
0217001.HXP	Littelfuse Inc.	217	1	250	5mm x 20mm	Fast Blow	35	1.045	0.0964	BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE
0217001.MXBP	Littelfuse Inc.	217	1	250	5mm x 20mm	Fast Blow	35	1.045	0.0964	BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE
0217001.MXP	Littelfuse Inc.	217	1	250	5mm x 20mm	Fast Blow	35	1.045	0.0964	BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE

Engineering Selection Recommendations

Direct Manufacturer Equivalents (Eaton - Electronics Division):

BK/GMA-1-R represents the direct equivalent to GMA-1-R with identical electrical parameters, breaking capacity, and melting I²t characteristics. Both parts carry CSA, PSE, and UL approvals and maintain the same DC cold resistance specification of 0.163 Ohms. This part is suitable for direct substitution without circuit redesign.

Parametric Equivalents (Eaton - Electronics Division):

BK/GDB-1A and BK/S500-1-R maintain the core electrical parameters of 1 A at 250 V in the 5mm x 20mm package. BK/S500-1-R offers expanded international approvals including BSI, CCC, cULus, IMQ, SEMKO, and VDE, providing broader compliance coverage for global applications. Both parts exhibit slightly higher melting I²t values (0.6 versus 0.48) and lower DC cold resistance (0.125 Ohms versus 0.163 Ohms).

Cross-Manufacturer Substitutes (Littelfuse Inc.):

The Littelfuse 235 series (0235001.HXP and 0235001.MXP) provides equivalent 1 A, 250 V fast-blow performance with enhanced breaking capacity of 100 A and broader temperature operating range (-55°C to 125°C). These parts carry CE, CSA, KC, PSE, and UL certifications.

The Littelfuse 217 series (0217001.HXP, 0217001.MXBP, and 0217001.MXP) offers the most comprehensive international approval coverage including BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, and VDE. These parts feature the lowest DC cold resistance at 0.0964 Ohms and extended operating temperature range (-55°C to 125°C).

Cross-Manufacturer Substitutes (SCHURTER Inc.):

SCHURTER 0034.3872 (FSK 5x20 series) and 0034.1516 (FSF 5x20 series) maintain 1 A, 250 V fast-blow specifications with cULus and VDE certifications respectively. The FSF series exhibits higher melting I²t (1.13) and supports extended temperature operation (-55°C to 125°C).

All listed substitutes maintain ROHS3 compliance and REACH unaffected status consistent with the GMA-1-R specification.

Frequently Asked Questions (FAQ)

Q: Can BK/GMA-1-R be used as a direct replacement for GMA-1-R?

A: Yes. BK/GMA-1-R is a direct manufacturer equivalent with identical current rating (1 A), voltage rating (250 V), package format (5mm x 20mm), response time (fast blow), breaking capacity (35 A), and DC cold resistance (0.163 Ohms). Both parts carry the same approval agencies (CSA, PSE, UL) and maintain ROHS3 compliance.

Q: What is the difference between the Eaton GMA and GDB series fuses?

A: Both series maintain 1 A, 250 V fast-blow specifications in the 5mm x 20mm package. The GDB series exhibits a melting I²t of 0.6 compared to GMA's 0.48, and lower DC cold resistance of 0.125 Ohms versus 0.163 Ohms. GDB carries UL and VDE approvals, while GMA includes CSA and PSE certifications.

Q: Are Littelfuse 235 and 217 series fuses compatible with GMA-1-R applications?

A: Yes. Both Littelfuse series maintain the required 1 A, 250 V fast-blow specifications in the 5mm x 20mm package format. The 235 series provides 100 A breaking capacity and the 217 series offers the most extensive international certifications (BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE). Both series support extended operating temperatures (-55°C to 125°C).

Q: What is the significance of melting I²t values in fuse selection?

A: Melting I²t represents the thermal energy required to melt the fuse element. While all listed substitutes maintain the same 1 A current rating and 250 V voltage rating, variations in melting I²t (ranging from 0.4675 to 1.13 across the substitute list) reflect differences in element composition and thermal response characteristics. Selection should be based on circuit protection requirements and equipment thermal design specifications.

Q: Do all substitute parts require the same holder as GMA-1-R?

A: Yes. All listed substitute parts are cartridge-type fuses in the 5mm x 20mm package format with identical physical dimensions (0.205" Dia x 0.787" L). All require a compatible fuse holder designed for 5mm x 20mm cartridge fuses. Mechanical compatibility is maintained across all substitutes.

Q: Which substitute offers the broadest international compliance coverage?

A: The Littelfuse 217 series (0217001.HXP, 0217001.MXBP, 0217001.MXP) provides the most comprehensive approval coverage with certifications from BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, and VDE. The Eaton BK/S500-1-R also offers extensive coverage including BSI, CCC, CSA, cULus, IMQ, SEMKO, and VDE.

Q: Can SCHURTER fuses be substituted for Eaton or Littelfuse parts?

A: Yes. SCHURTER 0034.3872 and 0034.1516 maintain the core electrical parameters of 1 A, 250 V fast-blow in the 5mm x 20mm package. Both parts are ROHS3 compliant and REACH unaffected. Selection should consider specific approval agency requirements for your application.

Q: What is the operating temperature range for GMA-1-R?

A: The GMA-1-R specification does not include an operating temperature range. However, substitute parts from Littelfuse (235 and 217 series) and SCHURTER (FSK and FSF series) specify operating ranges of -55°C to 125°C, providing reference for thermal performance expectations.

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