GDB-63MA Equivalent & Substitute Parts Reference

Part Overview

The GDB-63MA is a 63 mA fast-blow glass cartridge fuse rated for 250 V AC/DC operation in a 5mm x 20mm package form factor. Manufactured by Eaton - Electronics Division, this component requires a dedicated fuse holder for installation. The part maintains active product status with 1108 units in current inventory. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response characteristics, and functional performance parameters to ensure direct interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	63 mA
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

Substitution eligibility for the GDB-63MA is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Current Rating: 63 mA (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Fast Blow (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Breaking Capacity @ Rated Voltage: 35A (exact match required)
Mounting Type: Requires Holder (exact match required)

All identified substitute parts meet these mandatory parameters without exception. Variations in secondary parameters such as DC Cold Resistance, Melting I²t, approval agencies, and operating temperature ranges do not affect substitution eligibility when primary electrical and mechanical specifications are identical.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (mA)	Voltage Rating (V AC)	Response Time	Package	Breaking Capacity (A)	DC Cold Resistance (Ohms)	Melting I²t	Product Status	Inventory (Pcs)
GDB-63MA	Eaton - Electronics Division	GDB	63	250	Fast Blow	5x20mm	35	12.5	0.00057	Active	1108
BK/GMA-63-R	Eaton - Electronics Division	GMA	63	250	Fast Blow	5x20mm	35	15.75	0.00024	Active	881
BK/S500-63-R	Eaton - Electronics Division	S500	63	250	Fast Blow	5x20mm	35	125	0.00057	Active	1017
BK1/S500-63-R	Eaton - Electronics Division	S500	63	250	Fast Blow	5x20mm	35	12.5	0.00057	Active	925
0034.1530	SCHURTER Inc.	FSF 5x20	63	250	Fast Blow	5x20mm	35	Not Specified	0.000278	Active	2249
0217.063HXP	Littelfuse Inc.	217	63	250	Fast Blow	5x20mm	35	10.45	0.00056	Active	1164
0217.063MXP	Littelfuse Inc.	217	63	250	Fast Blow	5x20mm	35	10.45	0.00056	Active	4632	Active

Engineering Selection Recommendations

All substitute parts listed maintain active product status and are functionally equivalent to the GDB-63MA based on matching electrical and mechanical specifications. Selection among available substitutes may be influenced by the following factors derived from provided data:

Compliance and Certification:

Littelfuse 0217.063HXP and 0217.063MXP carry the broadest approval agency coverage: CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE
SCHURTER 0034.1530 holds CCC, cURus, and VDE certifications
Eaton BK/GMA-63-R includes CSA, PSE, and UL approvals
Eaton GDB-63MA and BK/S500-63-R list no approval agencies in provided data

RoHS Compliance:

All substitute parts except BK/S500-63-R explicitly state ROHS3 Compliant status
BK1/S500-63-R indicates RoHS Compliant status
GDB-63MA does not specify RoHS status in provided data

Operating Temperature Range:

Littelfuse 0217.063HXP and 0217.063MXP: -55°C to 125°C
SCHURTER 0034.1530: -55°C to 125°C
All Eaton variants: Operating temperature not specified in provided data

Inventory Availability:

Littelfuse 0217.063MXP: 4632 units (highest availability)
SCHURTER 0034.1530: 2249 units
Eaton BK/S500-63-R: 1017 units
Eaton BK1/S500-63-R: 925 units
Eaton BK/GMA-63-R: 881 units

Frequently Asked Questions (FAQ)

Q: Can I substitute the GDB-63MA with any of the listed parts without circuit modification?

A: Yes. All listed substitute parts match the mandatory electrical and mechanical parameters: 63 mA current rating, 250 V AC voltage rating, fast-blow response, 5mm x 20mm package dimensions, and 35A breaking capacity. Direct substitution is supported without circuit redesign.

Q: What is the significance of DC Cold Resistance variation among substitutes?

A: DC Cold Resistance values vary across substitutes (ranging from 10.45 Ohms to 125 Ohms) but do not affect substitution eligibility. This parameter reflects internal fuse element design and does not impact the fuse's primary function of circuit protection at the specified current and voltage ratings.

Q: Why do Melting I²t values differ between the GDB-63MA and substitute parts?

A: Melting I²t represents the thermal energy required to melt the fuse element and varies based on internal construction. All parts maintain identical response time classification (fast-blow) and breaking capacity (35A), ensuring equivalent circuit protection performance despite I²t differences.

Q: Which substitute offers the best compliance coverage for international applications?

A: Littelfuse 0217.063HXP and 0217.063MXP provide the most comprehensive approval agency certifications, including CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE. These parts are suitable for applications requiring multi-regional compliance documentation.

Q: Are there temperature operating range limitations I should consider?

A: Littelfuse and SCHURTER substitutes specify operating ranges of -55°C to 125°C. Eaton variants do not provide operating temperature specifications in available data. For applications with extreme temperature requirements, Littelfuse or SCHURTER parts offer documented thermal performance.

Q: Does the fuse holder compatibility differ between manufacturers?

A: No. All parts require a standard 5mm x 20mm fuse holder. Mechanical compatibility is guaranteed across all listed substitutes and the original GDB-63MA.

Q: Which substitute has the highest current inventory?

A: Littelfuse 0217.063MXP maintains the highest inventory at 4632 units, followed by SCHURTER 0034.1530 at 2249 units. These options provide superior availability for high-volume procurement requirements.

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