BK/GDB-630MA Equivalent & Substitute Parts

Part Overview

The BK/GDB-630MA is a 630 mA fast-blow glass cartridge fuse rated for 250 V AC/DC operation in a 5mm x 20mm package. 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 945 units in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity when the primary part number becomes unavailable or when alternative certifications are required for specific applications.

Substiute Parts

BK/GDB-630MA

Eaton - Electronics DivisionIn Stock: 1033BK/GDB-630MA Datasheet

Current PartRFQ

BK/S500-630-R

Eaton - Electronics DivisionIn Stock: 1159BK/S500-630-R Datasheet

DirectRFQ

BK1/S500-630-R

Eaton - Electronics DivisionIn Stock: 1985BK1/S500-630-R Datasheet

Parametric EquivalentRFQ

GDB-630MA

Eaton - Electronics DivisionIn Stock: 1252GDB-630MA Datasheet

Parametric EquivalentRFQ

S500-630-R

Eaton - Electronics DivisionIn Stock: 883S500-630-R Datasheet

Parametric EquivalentRFQ

0217.630HXP

Littelfuse Inc.In Stock: 8570217.630HXP Datasheet

DirectRFQ

0217.630MXP

Littelfuse Inc.In Stock: 18790217.630MXP Datasheet

DirectRFQ

0217.630VXP

Littelfuse Inc.In Stock: 10770217.630VXP Datasheet

DirectRFQ

FSC-630MA

OptiFuseIn Stock: 1549FSC-630MA Datasheet

Parametric EquivalentRFQ

FSD-630MA

OptiFuseIn Stock: 5008FSD-630MA Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

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

Mandatory Matching Parameters:

• 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 Parameters:

• Breaking Capacity @ Rated Voltage: 35A (primary specification) or higher
• Size / Dimension: 0.205" Dia x 0.787" L (5.20mm x 20.00mm)
• DC Cold Resistance: 0.2 Ohms (nominal tolerance range)

Parts are grouped into three categories:

Direct Manufacturer Equivalents (Eaton - Electronics Division): BK/S500-630-R, BK1/S500-630-R, GDB-630MA, and S500-630-R share identical electrical and mechanical specifications with the main part. These parts differ only in series designation and approval agency certifications.

Cross-Manufacturer Equivalents (Littelfuse Inc.): 0217.630HXP, 0217.630MXP, and 0217.630VXP meet all mandatory parameters with identical breaking capacity. Melting I²t values (0.41) differ slightly from the main part (0.35), and DC cold resistance is 0.19 Ohms. Operating temperature range is specified as -55°C ~ 125°C.

Cross-Manufacturer Equivalents (OptiFuse): FSD-630MA and FSC-630MA meet all mandatory parameters. FSD-630MA has a melting I²t of 0.5505 and FSC-630MA has a breaking capacity of 100A. Both support extended operating temperature ranges.

Parameter Comparison

Engineering Selection Recommendations

Eaton - Electronics Division Parts (BK/S500-630-R, BK1/S500-630-R, GDB-630MA, S500-630-R):

These parts are direct equivalents to the BK/GDB-630MA with identical electrical specifications and mechanical dimensions. BK1/S500-630-R offers the highest inventory availability (1967 units) and extended approval agency certifications including BSI, CCC, CSA, cULus, IMQ, SEMKO, and VDE. BK/S500-630-R provides similar certifications with 1118 units in stock. Both S500 series parts carry ROHS3 compliance. Selection among these parts depends on specific approval agency requirements for the end application.

Littelfuse Inc. Parts (0217.630HXP, 0217.630MXP, 0217.630VXP):

These parts meet all mandatory electrical and mechanical parameters with identical 35A breaking capacity. The melting I²t value of 0.41 is higher than the main part specification of 0.35, and DC cold resistance is 0.19 Ohms compared to 0.2 Ohms. Operating temperature range extends to -55°C ~ 125°C. These parts carry comprehensive approval certifications including CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE. 0217.630MXP provides the highest inventory (1823 units) among Littelfuse options.

OptiFuse Parts (FSD-630MA, FSC-630MA):

FSD-630MA meets all mandatory parameters with a melting I²t of 0.5505 and supports -55°C ~ 125°C operation. This part offers the highest inventory availability across all substitutes (4921 units) and carries cURus and IEC 60127 approvals. FSC-630MA provides a higher breaking capacity of 100A with cULus and UL 248 approvals, supporting -55°C ~ 90°C operation. Both OptiFuse parts carry ROHS3 compliance.

Selection Criteria:

Choose substitute parts based on: (1) required approval agency certifications for the target application, (2) operating temperature range requirements, (3) inventory availability and lead time, and (4) DC cold resistance and melting I²t tolerance requirements specific to the circuit design.

Frequently Asked Questions (FAQ)

Q: Can BK/GDB-630MA be directly replaced with BK/S500-630-R?

A: Yes. Both parts share identical current rating (630 mA), voltage rating (250 V AC), response time (fast blow), package dimensions (5mm x 20mm), breaking capacity (35A), and DC cold resistance (0.2 Ohms). The primary difference is series designation and approval agency certifications. BK/S500-630-R carries additional certifications including BSI, CCC, CSA, cULus, IMQ, and SEMKO.

Q: What is the difference between Eaton and Littelfuse 630 mA fuses?

A: Eaton parts (GDB and S500 series) and Littelfuse parts (217 series) meet identical mandatory electrical and mechanical specifications. Littelfuse parts have a melting I²t of 0.41 compared to Eaton's 0.35, and DC cold resistance of 0.19 Ohms compared to 0.2 Ohms. Littelfuse parts specify operating temperature range as -55°C ~ 125°C, while Eaton parts do not specify this parameter. Approval agency certifications differ between manufacturers.

Q: Are OptiFuse FSD-630MA and FSC-630MA interchangeable with the main part?

A: Both OptiFuse parts meet all mandatory parameters: 630 mA current rating, 250 V AC voltage rating, fast-blow response, 5mm x 20mm package, and 35A breaking capacity (FSC-630MA has 100A). FSD-630MA has a melting I²t of 0.5505 and FSC-630MA does not specify this value. Both support -55°C ~ 125°C operation (FSC-630MA limited to -55°C ~ 90°C). Substitution is valid when these parameter differences are acceptable for the application.

Q: What does "requires holder" mean for this fuse?

A: This fuse is a cartridge type that must be installed in a compatible fuse holder. The fuse itself does not have threaded terminals or clips for direct mounting. A separate holder assembly designed for 5mm x 20mm cartridge fuses is required for installation in the circuit.

Q: Why do some parts specify operating temperature and others do not?

A: Operating temperature specification is provided by manufacturers based on their design validation and testing. Eaton parts do not specify this parameter in the provided data, while Littelfuse and OptiFuse parts specify -55°C ~ 125°C (OptiFuse FSC-630MA limited to -55°C ~ 90°C). Absence of specification does not indicate temperature limitation; it reflects manufacturer documentation practices.

Q: Can I use FSC-630MA with 100A breaking capacity instead of 35A?

A: FSC-630MA has a higher breaking capacity (100A) than the main part (35A). Higher breaking capacity indicates the fuse can safely interrupt larger fault currents. This is not a limitation for substitution; however, the application circuit design must be evaluated to ensure the higher breaking capacity is appropriate for the specific protection scheme.

Q: What is the significance of melting I²t values?

A: Melting I²t is a thermal characteristic that describes the fuse's response to overcurrent. The main part specifies 0.35, Littelfuse parts specify 0.41, and FSD-630MA specifies 0.5505. These values indicate the energy required to melt the fuse element. Differences in melting I²t affect the fuse's response time to specific overcurrent levels. Substitution is valid when the application circuit design accommodates these differences.

Q: Which substitute part has the best inventory availability?

A: FSD-630MA (OptiFuse) has the highest inventory with 4921 units in stock, followed by BK1/S500-630-R (Eaton) with 1967 units. All substitute parts listed have inventory availability exceeding 800 units.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts carry either RoHS Compliant or ROHS3 Compliant status. The main part BK/GDB-630MA is RoHS Compliant. ROHS3 represents compliance with the most recent RoHS directive revision.