GDC-630MA Equivalent & Substitute Parts

Part Overview

The GDC-630MA is a 630 mA, 250 V AC/DC slow blow glass cartridge fuse in a 5mm x 20mm package manufactured by Eaton - Electronics Division. This fuse requires a holder for installation and is designed for circuit protection applications requiring slow blow response characteristics. The part is currently active in production. Equivalent and substitute parts are identified to provide alternative sourcing options when the primary part number is unavailable or when design flexibility permits component selection from multiple qualified manufacturers.

Key Parameters

Parameter	Value
Current Rating	630 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Slow Blow
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35A
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)

Substitute Part Grouping Explanation

Substitution of the GDC-630MA is determined by strict equivalence across the following critical parameters:

Current Rating: 630 mA (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Response Time: Slow Blow (exact match required)
Breaking Capacity @ Rated Voltage: 35A (exact match required)

All substitute parts listed maintain these core electrical and mechanical specifications. Variations in secondary parameters such as melting I²t, DC cold resistance, operating temperature range, and approval agencies do not preclude substitution when the primary parameters align. Parts are grouped by manufacturer and series designation while maintaining full functional equivalence.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (Amps)	Voltage Rating (AC)	Response Time	Package / Case	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Product Status
GDC-630MA	Eaton - Electronics Division	GDC	630 mA	250 V	Slow Blow	5mm x 20mm	35A	1.33	0.186	Active
BK/GDC-630MA	Eaton - Electronics Division	GDC	630 mA	250 V	Slow Blow	5mm x 20mm	35A	1.33	0.186	Active
BK/GMD-630-R	Eaton - Electronics Division	GMD	630 mA	250 V	Slow Blow	5mm x 20mm	35A	3.1	0.629	Active
BK/S506-630-R	Eaton - Electronics Division	S506	630 mA	250 V	Slow Blow	5mm x 20mm	35A	1.33	0.186	Active
BK1/S506-630-R	Eaton - Electronics Division	S506	630 mA	250 V	Slow Blow	5mm x 20mm	35A	1.33	0.186	Active
S506-630-R	Eaton - Electronics Division	S506	630 mA	250 V	Slow Blow	5mm x 20mm	35A	1.33	0.186	Active
0034.3115	SCHURTER Inc.	FST 5x20	630 mA	250 V	Slow Blow	5mm x 20mm	35A	4.35	—	Active
0034.3772	SCHURTER Inc.	FSL 5x20	630 mA	250 V	Slow Blow	5mm x 20mm	35A	3.62	—	Active
0034.5041	SCHURTER Inc.	FTT 5x20	630 mA	250 V	Slow Blow	5mm x 20mm	35A	13.7	—	Active
0218.630HXP	Littelfuse Inc.	218	630 mA	250 V	Slow Blow	5mm x 20mm	35A	4.675	0.275	Active
0218.630MXP	Littelfuse	218	630 mA	250 V	Slow Blow	5mm x 20mm	35A	4.675	0.275	Active

Engineering Selection Recommendations

All listed substitute parts maintain active product status and are qualified for 630 mA, 250 V AC/DC slow blow operation in 5mm x 20mm cartridge form factor. Selection among equivalent parts may be based on the following considerations:

Eaton - Electronics Division Parts (GDC-630MA, BK/GDC-630MA, BK/GMD-630-R, BK/S506-630-R, BK1/S506-630-R, S506-630-R): These parts share common manufacturer origin and are fully interchangeable from an electrical and mechanical standpoint. The BK/GDC-630MA variant carries RoHS Compliant certification. The S506 series variants (BK/S506-630-R, BK1/S506-630-R, S506-630-R) carry ROHS3 Compliant status and broader approval agency coverage including BSI, CCC, CSA, cULus, IMQ, SEMKO, and VDE.

SCHURTER Inc. Parts (0034.3115, 0034.3772, 0034.5041): These parts are ROHS3 Compliant and carry REACH Unaffected status. The 0034.3115 (FST 5x20 series) operates across -55°C to 125°C. The 0034.3772 (FSL 5x20 series) operates across -40°C to 85°C. The 0034.5041 (FTT 5x20 series) operates across -40°C to 85°C. All three carry cURus or cULus approval.

Littelfuse Inc. Parts (0218.630HXP, 0218.630MXP): Both parts are ROHS3 Compliant, REACH Unaffected, and operate across -55°C to 125°C. These parts carry comprehensive approval agency coverage including CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE.

Frequently Asked Questions (FAQ)

Q: Can the GDC-630MA be directly replaced with any of the listed substitute parts?

A: Yes. All listed substitute parts maintain identical current rating (630 mA), voltage rating (250 V AC), response time (slow blow), package dimensions (5mm x 20mm), and breaking capacity (35A). Direct mechanical and electrical substitution is supported without circuit modification.

Q: What is the significance of melting I²t variation among substitute parts?

A: Melting I²t represents the thermal energy required to melt the fuse element and is a secondary characteristic that does not affect substitution eligibility when primary parameters (current, voltage, response time, package) are identical. Variations in melting I²t among qualified substitutes reflect different fuse element designs within the same functional class.

Q: Are there approval agency differences that affect substitution?

A: All substitute parts carry active product status and appropriate regulatory approvals for their respective markets. The GDC-630MA carries cURus and IMQ approval. Eaton S506 series variants carry BSI, CCC, CSA, cULus, IMQ, SEMKO, and VDE approval. SCHURTER parts carry cURus, cULus, CCC, and VDE approval. Littelfuse parts carry CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE approval. Selection should align with the specific regulatory requirements of the target application and market.

Q: Does DC cold resistance variation affect substitution?

A: DC cold resistance is a secondary electrical characteristic. The GDC-630MA specifies 0.186 Ohms. Substitute parts from Eaton (BK/GDC-630MA, BK/S506-630-R, BK1/S506-630-R, S506-630-R) maintain 0.186 Ohms. The BK/GMD-630-R variant specifies 0.629 Ohms. Littelfuse parts specify 0.275 Ohms. These variations do not preclude substitution when primary electrical parameters are met, but should be considered in applications with stringent resistance specifications.

Q: What is the operating temperature range for each substitute part?

A: The GDC-630MA does not specify an operating temperature range. SCHURTER 0034.3115 operates -55°C to 125°C. SCHURTER 0034.3772 operates -40°C to 85°C. SCHURTER 0034.5041 operates -40°C to 85°C. Littelfuse 0218.630HXP and 0218.630MXP operate -55°C to 125°C. Selection should account for the thermal environment of the target application.

Q: Are all substitute parts RoHS compliant?

A: The BK/GDC-630MA is RoHS Compliant. The Eaton S506 series variants (BK/S506-630-R, BK1/S506-630-R, S506-630-R) are ROHS3 Compliant. All SCHURTER parts (0034.3115, 0034.3772, 0034.5041) are ROHS3 Compliant. All Littelfuse parts (0218.630HXP, 0218.630MXP) are ROHS3 Compliant. The original GDC-630MA does not specify RoHS status in the provided data.

Q: Can substitute parts be mixed within a single circuit or application?

A: All substitute parts are electrically and mechanically equivalent for the specified 630 mA, 250 V slow blow function. However, design consistency and supply chain management typically favor standardization on a single part number per application to ensure uniform performance characteristics and simplify inventory management.

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