BK/GDC-63MA Equivalent & Substitute Parts

Part Overview

The BK/GDC-63MA is a 63 mA, 250 V AC/DC slow-blow glass fuse cartridge in 5mm x 20mm form factor manufactured by Eaton - Electronics Division. This component is classified as Active product status and requires a fuse holder for installation. Alternative equivalent parts are necessary to support supply chain flexibility, regional certification requirements, and inventory management across different procurement channels.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution eligibility for the BK/GDC-63MA is determined by strict equivalence across the following parameters:

Critical 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: Slow Blow (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Breaking Capacity @ Rated Voltage: 35A (exact match required)

All substitute parts listed below meet these critical parameters. Variations in secondary parameters such as DC Cold Resistance, Melting I²t, approval agencies, and operating temperature ranges do not disqualify substitution when the critical parameters are identical.

Parameter Comparison

Part Number	Manufacturer	Current Rating (mA)	Voltage (V AC)	Response Time	Package	Breaking Capacity (A)	DC Cold Resistance (Ohms)	Melting I²t	RoHS Status
BK/GDC-63MA	Eaton - Electronics Division	63	250	Slow Blow	5x20mm	35	6.96	0.021	RoHS Compliant
BK1/S506-63-R	Eaton - Electronics Division	63	250	Slow Blow	5x20mm	35	6.96	0.021	ROHS3 Compliant
BK/S506-63-R	Eaton - Electronics Division	63	250	Slow Blow	5x20mm	35	6.96	0.021	ROHS3 Compliant
GDC-63MA	Eaton - Electronics Division	63	250	Slow Blow	5x20mm	35	6.96	0.021	Not Specified
0218.063HXP	Littelfuse Inc.	63	250	Slow Blow	5x20mm	35	17.65	0.0117	ROHS3 Compliant
0218.063MXP	Littelfuse Inc.	63	250	Slow Blow	5x20mm	35	17.65	0.0117	ROHS3 Compliant

Engineering Selection Recommendations

Eaton GDC Series (BK/GDC-63MA, GDC-63MA): Both parts are from Eaton's GDC series with identical electrical characteristics. Selection between these variants depends on regional certification requirements and inventory availability. BK/GDC-63MA carries cULus and IMQ approvals, while GDC-63MA carries cURus and IMQ approvals.

Eaton S506 Series (BK1/S506-63-R, BK/S506-63-R): These S506 series variants from Eaton provide broader international certification coverage including BSI, CCC, CSA, IMQ, SEMKO, UR, and VDE. Both maintain identical electrical performance to the GDC series with ROHS3 compliance. The S506 series is suitable for applications requiring expanded global certification scope.

Littelfuse 218 Series (0218.063HXP, 0218.063MXP): Both Littelfuse parts meet all critical electrical parameters and are ROHS3 compliant. These components feature extended operating temperature range (-55°C to 125°C) and carry comprehensive international certifications (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE). DC Cold Resistance and Melting I²t values differ from Eaton variants but remain within the 35A breaking capacity specification. Selection of Littelfuse parts is appropriate when extended temperature performance or specific UL/CE certification pathways are required.

Frequently Asked Questions (FAQ)

Q: Can BK/GDC-63MA be directly replaced with BK1/S506-63-R?

A: Yes. Both parts share identical current rating (63 mA), voltage rating (250 V AC), response time (Slow Blow), package dimensions (5mm x 20mm), and breaking capacity (35A). The primary difference is certification scope, with S506 series offering broader international approvals.

Q: What is the difference between Eaton and Littelfuse substitute options?

A: All parts meet the critical electrical parameters. Eaton variants (GDC and S506 series) maintain DC Cold Resistance of 6.96 Ohms and Melting I²t of 0.021. Littelfuse variants (218 series) have DC Cold Resistance of 17.65 Ohms and Melting I²t of 0.0117, with extended operating temperature range (-55°C to 125°C). Both manufacturers' parts are rated for 35A breaking capacity at 250V.

Q: Are 0218.063HXP and 0218.063MXP interchangeable?

A: Yes. Both Littelfuse parts are electrically identical with matching current rating, voltage, response time, package, and breaking capacity. Selection between them depends on inventory availability and specific application requirements.

Q: Does the 5mm x 20mm package dimension apply to all substitutes?

A: Yes. All listed substitute parts use the identical 5mm x 20mm cartridge form factor and require the same fuse holder for installation.

Q: Which substitute part offers the broadest certification coverage?

A: BK1/S506-63-R and BK/S506-63-R from Eaton's S506 series carry the most comprehensive certification set: BSI, CCC, CSA, IMQ, SEMKO, UR, and VDE. Littelfuse 218 series parts carry CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE certifications.

Q: Can I use a substitute part with different DC Cold Resistance?

A: DC Cold Resistance variation between Eaton (6.96 Ohms) and Littelfuse (17.65 Ohms) variants does not affect substitution eligibility when all critical electrical parameters match. Selection should be based on application circuit requirements and thermal performance specifications.

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