GDA-125MA Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The GDA-125MA is a ceramic cartridge fuse manufactured by Eaton - Electronics Division, rated for 125 mA at 250 V AC/DC. This fast-blow fuse is designed for applications requiring overcurrent protection in a compact 5mm x 20mm form factor. The part is currently active in production with 720 units in stock. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional characteristics to ensure direct interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	125 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Ceramic
Response Time	Fast Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	1.5 kA
Mounting Type	Requires Holder
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)

Substitute Part Grouping Explanation

Substitution eligibility for the GDA-125MA is determined by strict equivalence across the following parameters:

Critical Matching Parameters:

Current Rating: 125 mA (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Fuse Type: Cartridge, Ceramic (exact match required)
Response Time: Fast Blow (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Breaking Capacity @ Rated Voltage: 1.5 kA (exact match required)
Mounting Type: Requires Holder (exact match required)

All identified substitute parts meet these criteria. Variations in secondary parameters such as DC cold resistance, melting I²t, operating temperature range, and compliance certifications do not affect functional interchangeability in standard circuit protection applications where the GDA-125MA is specified.

Parameter Comparison

Parameter	GDA-125MA (Eaton)	BK/S501-125-R (Eaton)	0216.125HXP (Littelfuse)
Current Rating (Amps)	125 mA	125 mA	125 mA
Voltage Rating - AC	250 V	250 V	250 V
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	Fast Blow	Fast Blow	Fast Blow
Package / Case	5mm x 20mm	5mm x 20mm	5mm x 20mm
Breaking Capacity @ Rated Voltage	1.5 kA	1.5 kA	1.5 kA
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)	0.205" Dia x 0.787" L (5.20mm x 20.00mm)	0.205" Dia x 0.787" L (5.20mm x 20.00mm)
Mounting Type	Requires Holder	Requires Holder	Requires Holder
DC Cold Resistance	12.3 Ohms	12.3 Ohms	3.675 Ohms
Melting I²t	0.0037	0.0037	0.00546
Product Status	Active	Active	Active
Approval Agency	CSA, UR	CSA, cULus	CCC, CE, CSA, SEMKO, UL, VDE

Engineering Selection Recommendations

All three parts are active products with current manufacturing status. Selection between GDA-125MA, BK/S501-125-R, and 0216.125HXP is based on availability, compliance requirements, and application-specific certifications.

GDA-125MA (Eaton - Electronics Division): Primary part with CSA and UR approvals. 720 units in stock. Suitable for applications requiring CSA or UR certification.

BK/S501-125-R (Eaton - Electronics Division): Eaton alternative with CSA and cULus approvals. 1057 units in stock. ROHS3 compliant. Highest inventory availability within Eaton product line.

0216.125HXP (Littelfuse Inc.): Cross-manufacturer substitute with broadest certification coverage (CCC, CE, CSA, SEMKO, UL, VDE). 1175 units in stock. ROHS3 compliant. Operating temperature range specified as -55°C to 125°C. Suitable for applications requiring multi-regional compliance or extended temperature operation.

All parts are electrically and mechanically interchangeable for standard 125 mA, 250 V AC/DC circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can BK/S501-125-R be used as a direct replacement for GDA-125MA?

A: Yes. Both parts share identical electrical ratings (125 mA, 250 V), fuse type (ceramic cartridge), response time (fast blow), mechanical dimensions (5mm x 20mm), and breaking capacity (1.5 kA). Both require a fuse holder for mounting.

Q: What is the difference between GDA-125MA and 0216.125HXP?

A: The parts are electrically and mechanically equivalent. Differences include manufacturer (Eaton vs. Littelfuse), DC cold resistance (12.3 Ohms vs. 3.675 Ohms), melting I²t (0.0037 vs. 0.00546), and certification scope. The 0216.125HXP includes a specified operating temperature range (-55°C to 125°C) and broader international certifications (CCC, CE, SEMKO, UL, VDE).

Q: Are all three parts ROHS compliant?

A: GDA-125MA does not specify RoHS status. BK/S501-125-R and 0216.125HXP are both ROHS3 compliant.

Q: Do these fuses require a specific holder?

A: All three parts are cartridge fuses requiring a holder. The 5mm x 20mm form factor is standard for this fuse category. Ensure the holder is rated for 250 V AC and 125 mA minimum.

Q: Which part has the best availability?

A: 0216.125HXP (Littelfuse) has the highest inventory at 1175 units, followed by BK/S501-125-R (Eaton) at 1057 units, and GDA-125MA (Eaton) at 720 units.

Q: Can I use these fuses in DC applications?

A: All three parts are rated for 250 V AC/DC. They are suitable for both AC and DC circuit protection applications at or below 250 V.

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