BK/GDB-63MA Equivalent & Substitute Parts

Part Overview

The BK/GDB-63MA is a 63 mA, 250 V AC/DC fast-blow glass cartridge fuse with a 5mm x 20mm form factor. This fuse requires a compatible holder for installation and is designed for circuit protection applications requiring fast response characteristics. The part is currently active in production with 708 units in stock. Equivalent and substitute parts are necessary to support supply chain flexibility, accommodate regional availability constraints, and provide alternative sourcing options from qualified manufacturers while maintaining identical electrical and mechanical performance.

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 BK/GDB-63MA is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

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

All substitute parts listed below meet these mandatory requirements. Variations in secondary parameters such as DC cold resistance, melting I²t, and approval agency certifications do not disqualify substitution but may influence selection based on specific application requirements or regional compliance needs.

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	RoHS Status	Inventory (Pcs)
BK/GDB-63MA	Eaton - Electronics Division	GDB	63	250	Fast Blow	5x20mm	35	12.5	0.00057	RoHS Compliant	708
BK/S500-63-R	Eaton - Electronics Division	S500	63	250	Fast Blow	5x20mm	35	125	0.00057	ROHS3 Compliant	1017
BK/GMA-63-R	Eaton - Electronics Division	GMA	63	250	Fast Blow	5x20mm	35	15.75	0.00024	ROHS3 Compliant	881
BK1/S500-63-R	Eaton - Electronics Division	S500	63	250	Fast Blow	5x20mm	35	12.5	0.00057	RoHS Compliant	925
GDB-63MA	Eaton - Electronics Division	GDB	63	250	Fast Blow	5x20mm	35	12.5	0.00057	Not Specified	1108
0217.063HXP	Littelfuse Inc.	217	63	250	Fast Blow	5x20mm	35	10.45	0.00056	ROHS3 Compliant	1164
0217.063MXP	Littelfuse Inc.	217	63	250	Fast Blow	5x20mm	35	10.45	0.00056	ROHS3 Compliant	4632
0034.1530	SCHURTER Inc.	FSF 5x20	63	250	Fast Blow	5x20mm	35	Not Specified	0.000278	ROHS3 Compliant	2249

Engineering Selection Recommendations

Eaton - Electronics Division Parts (BK/GDB-63MA, BK/S500-63-R, BK/GMA-63-R, BK1/S500-63-R, GDB-63MA): All Eaton variants are direct manufacturer equivalents with identical electrical performance. Selection among these parts depends on regional compliance requirements and inventory availability. BK/GMA-63-R carries CSA, PSE, and UL certifications, making it suitable for applications requiring these specific approvals. BK/S500-63-R and BK1/S500-63-R offer ROHS3 compliance with higher inventory levels (1017 and 925 units respectively).

Littelfuse Inc. Parts (0217.063HXP, 0217.063MXP): Both Littelfuse variants meet all mandatory electrical and mechanical parameters with comprehensive approval agency certifications including CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE. Operating temperature range of -55°C to 125°C is specified. The 0217.063MXP variant has the highest inventory availability at 4632 units. DC cold resistance is lower at 10.45 Ohms compared to the main part.

SCHURTER Inc. Part (0034.1530): The SCHURTER FSF 5x20 series part meets all mandatory parameters with CCC, cURus, and VDE certifications. Operating temperature range of -55°C to 125°C is specified. Inventory availability is 2249 units. Melting I²t value of 0.000278 differs from other variants.

Selection should prioritize parts with active product status and highest inventory availability for supply chain continuity. Regional compliance certifications should align with end-application requirements.

Frequently Asked Questions (FAQ)

Q: Can BK/GDB-63MA be directly replaced with any of the listed substitute parts?

A: Yes. All listed substitute parts are electrically and mechanically equivalent. They share identical current rating (63 mA), voltage rating (250 V AC), response time (fast blow), and physical dimensions (5mm x 20mm). Direct substitution is permissible without circuit modification.

Q: What is the significance of DC cold resistance variations among the substitute parts?

A: DC cold resistance values range from 10.45 Ohms (Littelfuse variants) to 125 Ohms (BK/S500-63-R). These variations reflect different internal construction designs but do not affect fuse performance at rated operating conditions. Selection based on DC cold resistance is application-specific and should be determined by circuit design requirements.

Q: Are there approval agency differences that affect substitution?

A: Yes. BK/GMA-63-R carries CSA, PSE, and UL certifications. Littelfuse variants (0217.063HXP, 0217.063MXP) carry CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE certifications. SCHURTER part (0034.1530) carries CCC, cURus, and VDE certifications. Selection should match the approval agencies required by the end application and regional standards.

Q: Do all substitute parts require the same holder as the main part?

A: Yes. All substitute parts are 5mm x 20mm cartridge fuses requiring a compatible 5x20mm fuse holder. No holder modification is necessary when substituting between listed parts.

Q: What is the difference between melting I²t values across the substitute parts?

A: Melting I²t values range from 0.00024 (BK/GMA-63-R) to 0.000278 (0034.1530). These values represent the thermal energy required to melt the fuse element and reflect design variations among manufacturers. All values are within the range consistent with 63 mA fast-blow fuses and do not prevent substitution.

Q: Which substitute part has the highest inventory availability?

A: The Littelfuse 0217.063MXP has the highest inventory at 4632 units, followed by SCHURTER 0034.1530 at 2249 units and Eaton GDB-63MA at 1108 units.

Q: Are there operating temperature specifications for all parts?

A: Operating temperature range is specified for Littelfuse variants (0217.063HXP, 0217.063MXP) and SCHURTER part (0034.1530) as -55°C to 125°C. Operating temperature is not specified for Eaton variants. Applications requiring defined temperature performance should prioritize Littelfuse or SCHURTER parts.

Q: What RoHS compliance status applies to each substitute?

A: BK/GDB-63MA and BK1/S500-63-R are RoHS Compliant. BK/S500-63-R, BK/GMA-63-R, 0217.063HXP, 0217.063MXP, and 0034.1530 are ROHS3 Compliant. GDB-63MA RoHS status is not specified. ROHS3 compliance is the current standard for new component designs.

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