GDB-630MA Equivalent & Substitute Parts Reference

Part Overview

The GDB-630MA is a 630 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 under the GDB series, this component is classified as Active product status. The fuse requires a compatible holder for installation and is designed for applications requiring fast response time protection. Substitute parts become necessary due to inventory availability, regional compliance requirements, or specific approval agency certifications required for end-use applications.

Key Parameters

Parameter	Value	Unit
Current Rating	630	mA
Voltage Rating - AC	250	V
Fuse Type	Cartridge, Glass	—
Response Time	Fast Blow	—
Package / Case	5mm x 20mm	—
Mounting Type	Requires Holder	—
Breaking Capacity @ Rated Voltage	35	A
DC Cold Resistance	0.2	Ohms

Substitute Part Grouping Explanation

Substitution eligibility for the GDB-630MA is determined by strict equivalence across the following parameters:

Primary Substitution Criteria (Must Match Exactly):

Current Rating: 630 mA
Voltage Rating - AC: 250 V
Fuse Type: Cartridge, Glass
Response Time: Fast Blow
Package / Case: 5mm x 20mm
Mounting Type: Requires Holder

Secondary Compatibility Factors:

Breaking Capacity @ Rated Voltage: 35 A (baseline reference)
DC Cold Resistance: 0.2 Ohms (baseline reference)
Melting I²t: 0.35 (baseline reference)

All substitute parts listed below meet or exceed the primary substitution criteria. Variations in secondary factors (Breaking Capacity, DC Cold Resistance, Melting I²t, Operating Temperature range, and Approval Agency certifications) are permitted and do not affect functional interchangeability within the specified electrical and mechanical parameters.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (mA)	Voltage Rating - AC (V)	Package / Case	Response Time	Breaking Capacity @ Rated Voltage (A)	DC Cold Resistance (Ohms)	Melting I²t	Product Status
GDB-630MA	Eaton - Electronics Division	GDB	630	250	5mm x 20mm	Fast Blow	35	0.2	0.35	Active
BK/S500-630-R	Eaton - Electronics Division	S500	630	250	5mm x 20mm	Fast Blow	35	0.2	0.35	Active
BK1/S500-630-R	Eaton - Electronics Division	S500	630	250	5mm x 20mm	Fast Blow	35	0.2	0.35	Active
S500-630-R	Eaton - Electronics Division	S500	630	250	5mm x 20mm	Fast Blow	35	0.2	0.35	Active
0217.630HXP	Littelfuse Inc.	217	630	250	5mm x 20mm	Fast Blow	35	0.19	0.41	Active
0217.630MXP	Littelfuse Inc.	217	630	250	5mm x 20mm	Fast Blow	35	0.19	0.41	Active
0217.630VXP	Littelfuse Inc.	217	630	250	5mm x 20mm	Fast Blow	35	0.19	0.41	Active
FSC-630MA	OptiFuse	FSC	630	250	5mm x 20mm	Fast Blow	100	0.179	—	Active
FSD-630MA	OptiFuse	FSD	630	250	5mm x 20mm	Fast Blow	35	—	0.5505	Active

Engineering Selection Recommendations

Eaton GDB Series Substitutes (BK/S500-630-R, BK1/S500-630-R, S500-630-R): All three Eaton S500 series variants are parametrically identical to the GDB-630MA across all primary and secondary criteria. These parts carry expanded approval agency certifications (BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE) compared to the GDB-630MA (VDE, UR). Selection among these three variants depends on regional compliance requirements and inventory availability.

Littelfuse 217 Series Substitutes (0217.630HXP, 0217.630MXP, 0217.630VXP): All three Littelfuse variants meet primary substitution criteria. Secondary parameter variations include DC Cold Resistance of 0.19 Ohms (versus 0.2 Ohms baseline) and Melting I²t of 0.41 (versus 0.35 baseline). Operating temperature range extends to -55°C ~ 125°C. Approval agencies include CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE. These parts are suitable for applications requiring extended temperature operation and broader international compliance certifications.

OptiFuse FSC-630MA: Meets all primary substitution criteria. Breaking Capacity is elevated to 100 A. Operating temperature range is -55°C ~ 90°C. Approval agencies are cULus and UL 248. This variant is suitable for applications requiring higher breaking capacity within the same current and voltage ratings.

OptiFuse FSD-630MA: Meets all primary substitution criteria. Melting I²t is 0.5505 (higher than baseline). Operating temperature range is -55°C ~ 125°C. Approval agencies are cURus and IEC 60127. This variant provides extended temperature operation and is suitable for IEC-compliant applications.

All substitute parts are Active status and RoHS3 compliant where specified.

Frequently Asked Questions (FAQ)

Q: Can I substitute GDB-630MA with any of the listed parts? A: Yes. All listed parts are parametrically equivalent across the critical substitution criteria: 630 mA current rating, 250 V AC voltage rating, fast-blow response time, and 5mm x 20mm package form factor. Physical installation compatibility is identical as all require a compatible fuse holder.

Q: What is the difference between the Eaton S500 variants (BK/S500-630-R, BK1/S500-630-R, S500-630-R)? A: All three are electrically and mechanically identical. The prefix designations (BK, BK1) indicate different packaging or distribution channel configurations. Selection should be based on inventory availability and regional supplier requirements.

Q: Why do Littelfuse 217 series parts have different Melting I²t values (0.41 versus 0.35)? A: Melting I²t is a secondary parameter that reflects thermal characteristics within the same current and voltage class. The difference does not affect substitution eligibility, as all parts maintain the same 630 mA fast-blow response profile and 250 V rating.

Q: Can I use FSC-630MA if my application requires 35 A breaking capacity? A: Yes. FSC-630MA has a breaking capacity of 100 A, which exceeds the 35 A baseline. Higher breaking capacity does not compromise compatibility; it provides additional safety margin for fault conditions.

Q: Are there temperature operating range differences I should consider? A: Yes. GDB-630MA does not specify an operating temperature range. Littelfuse 217 series and OptiFuse FSD-630MA extend to -55°C ~ 125°C, while OptiFuse FSC-630MA operates to -55°C ~ 90°C. Select based on your application's thermal environment.

Q: What approval agencies should I verify for my specific region? A: GDB-630MA carries VDE and UR approvals. Eaton S500 variants add BSI, CCC, CSA, cULus, IMQ, and SEMKO. Littelfuse 217 series includes CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE. OptiFuse variants carry cULus/UL or cURus/IEC certifications. Confirm your region's required certifications before final selection.

Q: Do all parts require the same fuse holder? A: Yes. All substitute parts use the identical 5mm x 20mm cartridge form factor and require a compatible 5mm x 20mm fuse holder. No mechanical modifications are necessary for substitution.

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