GDC-63MA Equivalent & Substitute Parts Reference

Part Overview

The GDC-63MA is a 63 mA, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm form factor manufactured by Eaton - Electronics Division. This fuse requires a compatible holder for installation and is designed for circuit protection applications requiring slow-blow response characteristics. The part maintains Active product status with 1145 pieces in current inventory. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response time classification, and approval certifications to ensure direct functional interchangeability in circuit protection applications.

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 GDC-63MA is determined by strict equivalence across the following parameters: current rating (63 mA), voltage rating (250 V AC), fuse type (cartridge glass), response time (slow blow), mechanical package (5mm x 20mm), and breaking capacity (35A). All identified substitute parts match these core electrical and mechanical specifications, ensuring functional interchangeability within the same circuit protection application context. Variations in secondary parameters such as DC cold resistance, melting I²t values, operating temperature ranges, and approval agency certifications do not disqualify substitution but are documented for engineering reference when environmental or regulatory constraints apply.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (mA)	Voltage Rating (V AC)	Response Time	Package (mm)	Breaking Capacity (A)	DC Cold Resistance (Ohms)	Melting I²t	Product Status
GDC-63MA	Eaton - Electronics Division	63	250	Slow Blow	5 x 20	35	6.96	0.021	Active
BK1/S506-63-R	Eaton - Electronics Division	63	250	Slow Blow	5 x 20	35	6.96	0.021	Active
BK/S506-63-R	Eaton - Electronics Division	63	250	Slow Blow	5 x 20	35	6.96	0.021	Active
0218.063HXP	Littelfuse Inc.	63	250	Slow Blow	5 x 20	35	17.65	0.0117	Active
0218.063MXP	Littelfuse Inc.	63	250	Slow Blow	5 x 20	35	17.65	0.0117	Active
5ST 63-R	Bel Fuse Inc.	63	250	Slow Blow	5 x 20	35	23.9	0.008	Active

Engineering Selection Recommendations

All substitute parts listed maintain Active product status and are suitable for direct replacement of the GDC-63MA in circuit protection applications. Selection between equivalent options should be based on the following criteria:

Eaton S506 Series (BK1/S506-63-R, BK/S506-63-R): These parts are manufactured by the same supplier as the main part and share identical electrical characteristics including DC cold resistance (6.96 Ohms) and melting I²t (0.021). Approval certifications include BSI, CCC, CSA, IMQ, SEMKO, UR, and VDE. These options provide maximum compatibility with existing designs and supply chain continuity.

Littelfuse 218 Series (0218.063HXP, 0218.063MXP): Both variants meet all core electrical and mechanical requirements with approval certifications including CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE. Operating temperature range extends to -55°C ~ 125°C. DC cold resistance is 17.65 Ohms and melting I²t is 0.0117, representing measurable differences in thermal response characteristics compared to the main part.

Bel Fuse 5ST Series (5ST 63-R): This part meets all core specifications with approval certifications including CCC, CE, CSA, cURus, IMQ, SEMKO, and VDE. Operating temperature range extends to -55°C ~ 125°C. DC cold resistance is 23.9 Ohms and melting I²t is 0.008, representing the most significant variation in thermal response among all listed options. Mechanical dimensions are 5.10mm x 20.00mm, a minor deviation from the 5.20mm x 20.00mm standard.

Selection should prioritize inventory availability, supply chain logistics, and application-specific environmental requirements when thermal response variations are not critical to circuit operation.

Frequently Asked Questions (FAQ)

Q: Can BK1/S506-63-R be used as a direct replacement for GDC-63MA?

A: Yes. Both parts are manufactured by Eaton - Electronics Division, share identical current rating (63 mA), voltage rating (250 V AC), response time (slow blow), mechanical package (5mm x 20mm), breaking capacity (35A), and DC cold resistance (6.96 Ohms). They are functionally equivalent for circuit protection applications.

Q: What is the difference between 0218.063HXP and 0218.063MXP?

A: Both Littelfuse parts share identical electrical ratings, voltage specifications, response time, mechanical package, breaking capacity, DC cold resistance (17.65 Ohms), and melting I²t (0.0117). The difference in part number designation reflects internal Littelfuse product line differentiation but does not affect functional interchangeability with GDC-63MA.

Q: Why does 5ST 63-R have different DC cold resistance (23.9 Ohms) compared to GDC-63MA (6.96 Ohms)?

A: DC cold resistance variation reflects differences in internal fuse element design and material composition between manufacturers. Both parts meet the same current rating, voltage rating, and breaking capacity specifications. The variation does not disqualify substitution but should be considered if circuit design includes resistance-dependent calculations or if thermal response characteristics are application-critical.

Q: Are all substitute parts RoHS3 compliant?

A: Littelfuse (0218.063HXP, 0218.063MXP) and Eaton S506 series (BK1/S506-63-R, BK/S506-63-R) are explicitly marked as ROHS3 Compliant. The main part GDC-63MA does not specify RoHS status in provided data. Bel Fuse 5ST 63-R does not list RoHS status. Verify RoHS compliance requirements with your procurement or regulatory team before final selection.

Q: Can these fuses be used interchangeably in the same holder?

A: All parts share the 5mm x 20mm mechanical package specification. However, 5ST 63-R has a minor dimensional variation (5.10mm diameter versus 5.20mm standard). Verify holder specifications to confirm mechanical fit tolerance before substitution.

Q: Which substitute part has the widest operating temperature range?

A: Both Littelfuse (0218.063HXP, 0218.063MXP) and Bel Fuse (5ST 63-R) specify operating temperature range of -55°C ~ 125°C. The main part GDC-63MA and Eaton S506 series do not specify operating temperature limits in provided data.

Q: What approval certifications are common across all parts?

A: CCC, CSA, IMQ, and VDE certifications are present across all listed parts. Additional certifications vary by manufacturer. Verify specific regulatory requirements for your application region before final selection.

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