GMA-2-R Equivalent & Substitute Parts Reference

Part Overview

The GMA-2-R is a 2 A, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Eaton - Electronics Division. This component is designed for use in fuse holders with 5mm x 20mm dimensions and requires a separate holder for installation. The part maintains Active product status with 1062 pieces in current inventory.

Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across the same fuse category, voltage rating, current rating, response time, and physical dimensions. Alternative sources become necessary due to supply chain considerations, regional availability, or specific certification requirements for end-application compliance.

Key Parameters

Parameter	Value
Current Rating	2 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	100 A
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution logic for the GMA-2-R is based on strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Current Rating: 2 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Fast Blow (exact match required)
Physical Dimensions: 5mm x 20mm (exact match required)
Mounting Type: Requires Holder (exact match required)

Secondary Consideration Parameters:

Breaking Capacity @ Rated Voltage (100 A preferred; 35 A acceptable with functional equivalence)
Melting I²t (3.1 baseline; variations within 4.2 acceptable)
DC Cold Resistance (0.066 Ohms baseline; variations acceptable within operational range)
Approval Agencies (CSA, PSE, UL baseline; additional certifications acceptable)

Substitute parts are classified into two categories:

Direct Substitutes: Parts with identical electrical and mechanical specifications, differing only in manufacturer or series designation. These include BK/GMA-2-R, 0235002.MXP, 0235002.VXP, and 0034.3877.

Parametric Equivalents: Parts meeting all primary equivalence criteria with minor variations in secondary parameters. These include BK/GDB-2A, BK/S500-2-R, BK1/S500-2-R, S500-2-R, and 0217002.MXP.

Similar Parts: Components meeting primary criteria with notable variations in breaking capacity or melting I²t. These include 5MF 2-R.

Parameter Comparison

Part Number	Manufacturer	Series	Current (A)	Voltage (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status
GMA-2-R	Eaton	GMA	2	250	Fast Blow	5x20mm	100	3.1	0.066	Active
BK/GMA-2-R	Eaton	GMA	2	250	Fast Blow	5x20mm	100	3.1	0.066	Active
BK/GDB-2A	Eaton	GDB	2	250	Fast Blow	5x20mm	35	4.2	0.043	Active
BK/S500-2-R	Eaton	S500	2	250	Fast Blow	5x20mm	35	4.2	0.043	Active
BK1/S500-2-R	Eaton	S500	2	250	Fast Blow	5x20mm	35	4.2	0.043	Active
S500-2-R	Eaton	S500	2	250	Fast Blow	5x20mm	35	4.2	0.043	Active
0034.3877	SCHURTER	FSK 5x20	2	250	Fast Blow	5x20mm	100	2.93	—	Active
0235002.MXP	Littelfuse	235	2	250	Fast Blow	5x20mm	100	2.645	0.0603	Active
0235002.VXP	Littelfuse	235	2	250	Fast Blow	5x20mm	100	2.645	0.0603	Active
0217002.MXP	Littelfuse	217	2	250	Fast Blow	5x20mm	35	5.73	0.0416	Active
5MF 2-R	Bel Fuse	5MF	2	250	Fast Blow	5x20mm	200	4.4	0.046	Active

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

BK/GMA-2-R represents the direct equivalent from Eaton with identical electrical and mechanical specifications. This part carries the same approval agencies (CSA, PSE, UL) and maintains 100 A breaking capacity with 3.1 melting I²t. Selection is appropriate when Eaton sourcing is required or when existing system documentation specifies GMA series components.

0235002.MXP and 0235002.VXP from Littelfuse maintain 100 A breaking capacity and fast-blow response with 2.645 melting I²t. Both parts carry expanded approval certifications (CE, CSA, KC, PSE, UL for MXP; CE, CSA, K-MARK, PSE, UL for VXP) and operate across -55°C to 125°C temperature range. These parts are suitable for applications requiring broader international compliance.

0034.3877 from SCHURTER provides 100 A breaking capacity with 2.93 melting I²t and cULus certification. Operating temperature range of -40°C to 85°C supports industrial applications. This part is appropriate when SCHURTER component standardization is required.

Parametric Equivalents (Functional Compatibility):

BK/GDB-2A, BK/S500-2-R, BK1/S500-2-R, and S500-2-R from Eaton maintain 2 A, 250 V, fast-blow specifications with 5x20mm dimensions but feature reduced breaking capacity (35 A) and increased melting I²t (4.2). These parts are functionally equivalent for applications where 35 A breaking capacity is sufficient. BK/S500-2-R and BK1/S500-2-R carry expanded certifications (BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE) supporting global deployment.

0217002.MXP from Littelfuse operates at 2 A, 250 V with 5x20mm dimensions and fast-blow response but features 35 A breaking capacity and elevated melting I²t (5.73). This part carries the broadest certification portfolio (BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE) and operates across -55°C to 125°C, supporting demanding international applications.

Similar Parts (Application-Dependent):

5MF 2-R from Bel Fuse maintains core electrical specifications (2 A, 250 V, fast-blow, 5x20mm) but features 200 A breaking capacity and 4.4 melting I²t. Physical dimensions vary slightly (5.10mm diameter versus 5.20mm baseline). This part is suitable for applications requiring enhanced breaking capacity and is certified for CE, CSA, cULus, and PSE compliance.

All listed parts maintain ROHS3 compliance and REACH unaffected status, supporting environmental regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can BK/GMA-2-R be used as a direct replacement for GMA-2-R?

A: Yes. BK/GMA-2-R is a direct equivalent with identical current rating (2 A), voltage rating (250 V), response time (fast-blow), physical dimensions (5x20mm), breaking capacity (100 A), and melting I²t (3.1). Both parts carry CSA, PSE, and UL certifications. The BK designation indicates packaging or regional variant only.

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

A: Breaking capacity defines the maximum fault current the fuse can safely interrupt without rupturing the fuse holder or creating hazardous conditions. The GMA-2-R and direct substitutes (0235002.MXP, 0235002.VXP, 0034.3877, 5MF 2-R) feature 100 A breaking capacity. Parametric equivalents (BK/GDB-2A, S500 series, 0217002.MXP) feature 35 A breaking capacity. Selection depends on the maximum prospective fault current in the application circuit.

Q: Are Littelfuse 235 series parts (0235002.MXP, 0235002.VXP) interchangeable?

A: Yes. Both parts maintain identical electrical specifications (2 A, 250 V, fast-blow, 100 A breaking capacity, 2.645 melting I²t) and physical dimensions (5x20mm). The primary difference is certification scope: 0235002.MXP carries CE, CSA, KC, PSE, UL; 0235002.VXP carries CE, CSA, K-MARK, PSE, UL. Selection depends on regional compliance requirements.

Q: Can I use 0217002.MXP (Littelfuse 217 series) in place of GMA-2-R?

A: 0217002.MXP is a parametric equivalent meeting 2 A, 250 V, fast-blow, and 5x20mm requirements. However, breaking capacity is reduced to 35 A (versus 100 A baseline) and melting I²t is elevated to 5.73 (versus 3.1 baseline). This part is suitable only if the application circuit prospective fault current does not exceed 35 A and if the elevated melting I²t is acceptable for the protected circuit.

Q: What does melting I²t represent?

A: Melting I²t is the thermal energy (in ampere-squared seconds) required to melt the fuse element. Lower values indicate faster response to overcurrent conditions. The GMA-2-R baseline is 3.1. Littelfuse 235 series parts feature 2.645 (faster response), while 217 series features 5.73 (slower response). Selection depends on circuit protection requirements and device sensitivity to thermal stress.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance status, meeting environmental regulatory requirements for restricted hazardous substances.

Q: Which substitute part offers the broadest international certification?

A: 0217002.MXP from Littelfuse carries the most comprehensive certification portfolio: BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE. This part is appropriate for applications requiring global deployment across multiple regulatory jurisdictions.

Q: Can 5MF 2-R be used despite the 5.10mm diameter specification?

A: 5MF 2-R features 5.10mm diameter versus the 5.20mm baseline. This 0.10mm dimensional variance may affect fit tolerance in some fuse holders. Mechanical compatibility must be verified with the specific holder design before deployment. Electrical specifications (2 A, 250 V, fast-blow, 5x20mm length) are otherwise equivalent.

Q: What is the operating temperature range for GMA-2-R?

A: Operating temperature is not specified in the GMA-2-R data. Substitute parts with specified ranges include: 0235002.MXP and 0235002.VXP (-55°C to 125°C), 0217002.MXP (-55°C to 125°C), 5MF 2-R (-55°C to 125°C), and 0034.3877 (-40°C to 85°C). Application temperature requirements should guide selection when thermal performance is critical.

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