GMA-125MA Equivalent & Substitute Parts

Part Overview

The GMA-125MA is a 125 mA, 250 V AC/DC fast-blow glass cartridge fuse in a 5mm x 20mm package manufactured by Eaton - Electronics Division. This fuse requires a compatible holder for installation and is designed for general-purpose circuit protection applications. The part is active in production with 1055 pieces in current inventory. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response characteristics, and approval certifications to ensure direct functional interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	125 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Fast Blow
Breaking Capacity @ Rated Voltage	35A
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitute parts for the GMA-125MA are grouped into two categories based on parametric equivalence:

Category 1: Eaton GMA Series and Related Variants These parts maintain identical electrical specifications (125 mA, 250 V AC/DC, fast-blow response, 35A breaking capacity) and mechanical dimensions (5mm x 20mm). Substitutes include GMA-125-R, BK/GMA-125-R, and BK1/GMA-125-R. All variants share the same melting I²t value of 0.0024 and DC cold resistance of 4.895 Ohms. Packaging differences (standard vs. bulk) do not affect functional performance.

Category 2: Eaton S500 Series These parts match all critical electrical parameters (125 mA, 250 V AC/DC, fast-blow response, 35A breaking capacity) and mechanical dimensions (5mm x 20mm). Substitutes include BK/S500-125-R, BK1/S500-125-R, and S500-125-R. These variants have a melting I²t value of 0.005 and DC cold resistance of 2.8 Ohms, representing acceptable parametric variation within the fast-blow fuse category.

Category 3: Third-Party Manufacturers SCHURTER 0034.1507 and Littelfuse 0217.125HXP and 0217.125MXBP meet all electrical and mechanical requirements with melting I²t values of 0.00484 and 0.00478 respectively, and DC cold resistance of 3.82 Ohms. These parts are functionally equivalent across all critical parameters.

Substitution is determined by matching: current rating (125 mA), voltage rating (250 V AC), fuse type (cartridge glass), package dimensions (5mm x 20mm), response time (fast-blow), and breaking capacity (35A).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Current Rating (mA)	Voltage Rating (V AC)	Response Time	Package (mm)	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	RoHS Status	Inventory (Pcs)
GMA-125MA	Eaton	GMA	125	250	Fast Blow	5 x 20	35	0.0024	4.895	ROHS3	1055
GMA-125-R	Eaton	GMA	125	250	Fast Blow	5 x 20	35	0.0024	4.895	ROHS3	1060
BK/GMA-125-R	Eaton	GMA	125	250	Fast Blow	5 x 20	35	0.0024	4.895	ROHS3	2252
BK1/GMA-125-R	Eaton	GMA	125	250	Fast Blow	5 x 20	35	0.0024	4.895	RoHS	668
BK/GDB-125MA	Eaton	GDB	125	250	Fast Blow	5 x 20	35	0.005	2.8	RoHS	1064
BK/S500-125-R	Eaton	S500	125	250	Fast Blow	5 x 20	35	0.005	2.8	ROHS3	1143
BK1/S500-125-R	Eaton	S500	125	250	Fast Blow	5 x 20	35	0.005	2.8	RoHS	650
S500-125-R	Eaton	S500	125	250	Fast Blow	5 x 20	35	0.005	2.8	ROHS3	701
0034.1507	SCHURTER	FSF 5x20	125	250	Fast Blow	5 x 20	35	0.00484	—	ROHS3	1019
0217.125HXP	Littelfuse	217	125	250	Fast Blow	5 x 20	35	0.00478	3.82	ROHS3	1027
0217.125MXBP	Littelfuse	217	125	250	Fast Blow	5 x 20	35	0.00478	3.82	ROHS3	757

Engineering Selection Recommendations

Primary Substitutes (Eaton GMA Series) GMA-125-R, BK/GMA-125-R, and BK1/GMA-125-R are direct functional equivalents to GMA-125MA. These parts maintain identical electrical characteristics, mechanical dimensions, and response behavior. BK/GMA-125-R offers the highest inventory availability (2252 pieces) and carries ROHS3 compliance with CSA, PSE, and UL certifications. BK1/GMA-125-R carries RoHS compliance with CSA, PSE, and UL certifications.

Secondary Substitutes (Eaton S500 Series) BK/S500-125-R, BK1/S500-125-R, and S500-125-R are parametrically equivalent with identical electrical ratings and mechanical dimensions. These parts exhibit different DC cold resistance (2.8 Ohms vs. 4.895 Ohms) and melting I²t (0.005 vs. 0.0024), which remain within acceptable fast-blow fuse performance parameters. BK/S500-125-R provides ROHS3 compliance with 1143 pieces in inventory.

Third-Party Alternatives Littelfuse 0217.125HXP and 0217.125MXBP meet all electrical and mechanical specifications with comprehensive international certifications (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE). These parts carry ROHS3 compliance and operating temperature range of -55°C to 125°C. SCHURTER 0034.1507 provides an alternative with CCC, cURus, and VDE certifications, ROHS3 compliance, and operating temperature range of -55°C to 125°C.

Compliance Considerations All substitute parts carry RoHS or ROHS3 compliance. Selection should account for specific approval agency requirements: Eaton GMA variants carry CSA, PSE, and UL certifications; Littelfuse parts carry broader international certifications including CE and VDE; SCHURTER carries VDE certification. Inventory levels vary, with BK/GMA-125-R offering maximum availability.

Frequently Asked Questions (FAQ)

Q: Can GMA-125-R be used as a direct replacement for GMA-125MA? A: Yes. GMA-125-R is a direct functional equivalent with identical current rating (125 mA), voltage rating (250 V AC), fuse type (cartridge glass), package dimensions (5mm x 20mm), response time (fast-blow), and breaking capacity (35A). Both parts carry the same electrical characteristics and certifications.

Q: What is the difference between GMA series and S500 series substitutes? A: Both series meet all critical electrical and mechanical requirements. The primary differences are DC cold resistance (GMA: 4.895 Ohms vs. S500: 2.8 Ohms) and melting I²t (GMA: 0.0024 vs. S500: 0.005). Both values fall within acceptable fast-blow fuse performance parameters and do not affect functional interchangeability in standard circuit protection applications.

Q: Are Littelfuse 0217.125HXP and 0217.125MXBP interchangeable with the GMA-125MA? A: Yes. Both Littelfuse parts match all critical specifications: 125 mA current rating, 250 V AC voltage rating, fast-blow response, 5mm x 20mm package dimensions, and 35A breaking capacity. Littelfuse parts carry broader international certifications (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE) and an operating temperature range of -55°C to 125°C.

Q: Does the packaging designation (bulk vs. standard) affect fuse performance? A: No. Packaging designations such as "Bulk" or standard packaging do not affect electrical performance or functional characteristics. The designation refers only to the quantity and presentation format of the parts in inventory.

Q: What certifications should I verify for my specific application? A: Certification requirements depend on the end application and regional standards. Eaton GMA variants carry CSA, PSE, and UL certifications. Littelfuse parts carry CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE certifications. SCHURTER carries CCC, cURus, and VDE certifications. Confirm that the selected part meets your application's required approval agencies.

Q: Can I substitute a part with different DC cold resistance? A: Yes. DC cold resistance variations between substitute parts (ranging from 2.8 to 4.895 Ohms) do not affect fuse functionality in standard circuit protection applications. All parts maintain the same current rating, voltage rating, and response characteristics.

Q: What is the significance of melting I²t values in the parameter comparison? A: Melting I²t indicates the thermal energy required to melt the fuse element. Variations in this parameter (ranging from 0.00478 to 0.005) among fast-blow fuses remain within acceptable performance tolerances and do not compromise functional interchangeability for standard applications.

Q: Are all substitute parts RoHS compliant? A: Yes. All substitute parts listed carry either RoHS or ROHS3 compliance status, meeting environmental and hazardous substance restrictions applicable to electronic components.

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