GDB-8A Equivalent & Substitute Parts

Part Overview

The GDB-8A is an 8 A, 250 V AC/DC fast-blow glass cartridge fuse in a 5mm x 20mm package manufactured by Eaton - Electronics Division. This fuse is designed for use in applications requiring overcurrent protection and operates as an active product with VDE and UR approval. Substitute parts are identified when equivalent electrical characteristics, mechanical dimensions, and functional performance parameters align with the original specification, enabling direct replacement in compatible fuse holders.

Key Parameters

Parameter	Value
Current Rating	8 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	80 A (primary specification)
Mounting Type	Requires Holder
DC Cold Resistance	0.01 Ohms

Substitute Part Grouping Explanation

Substitution eligibility for the GDB-8A is determined by strict equivalence across the following parameters:

Primary Substitution Criteria:

Current Rating: 8 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Fast Blow (exact match required)
Mounting Type: Requires Holder (exact match required)

All substitute parts listed meet these core electrical and mechanical requirements. Variations in secondary parameters such as breaking capacity, DC cold resistance, melting I²t, operating temperature range, and approval agencies do not disqualify a part from substitution provided the primary criteria are satisfied. Parts are grouped by manufacturer to facilitate procurement and supply chain management.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Package	Response Time	Breaking Capacity (A)	DC Cold Resistance (Ohms)	Product Status
GDB-8A	Eaton - Electronics Division	8	250	5mm x 20mm	Fast Blow	80	0.01	Active
BK/GDB-8A	Eaton - Electronics Division	8	250	5mm x 20mm	Fast Blow	80	0.01	Active
BK/S500-8-R	Eaton - Electronics Division	8	250	5mm x 20mm	Fast Blow	80	0.01	Active
BK1/S500-8-R	Eaton - Electronics Division	8	250	5mm x 20mm	Fast Blow	80	0.01	Active
S500-8-R	Eaton - Electronics Division	8	250	5mm x 20mm	Fast Blow	80	0.01	Active
0034.1525	SCHURTER Inc.	8	250	5mm x 20mm	Fast Blow	80	Not specified	Active
0217008.HXP	Littelfuse Inc.	8	250	5mm x 20mm	Fast Blow	80	0.0068	Active
0217008.MXP	Littelfuse Inc.	8	250	5mm x 20mm	Fast Blow	80	0.0068	Active
0617008.MXP	Littelfuse Inc.	8	250	5mm x 20mm	Fast Blow	80	0.0068	Active
FSC-8A	OptiFuse	8	250	5mm x 20mm	Fast Blow	200	100	Active
FSD-8A	OptiFuse	8	250	5mm x 20mm	Fast Blow	35	Not specified	Active

Engineering Selection Recommendations

Eaton - Electronics Division Series (GDB and S500): The BK/GDB-8A, BK/S500-8-R, BK1/S500-8-R, and S500-8-R parts are direct equivalents manufactured by Eaton and maintain identical electrical and mechanical specifications to the GDB-8A. These parts carry active product status and hold approvals from UL, VDE, BSI, CSA, cULus, and SEMKO. Selection from this group is appropriate for applications requiring continuity with the original manufacturer or when Eaton-specific supply chain requirements apply.

SCHURTER Inc. (FSF 5x20 Series): The 0034.1525 fuse meets all primary substitution criteria and is approved by cURus, PSE/JET, and VDE. This part operates across an extended temperature range of -55°C to 125°C and carries ROHS3 compliance. Selection is appropriate for applications requiring broader temperature performance or SCHURTER supply chain integration.

Littelfuse Inc. (217 and 617 Series): The 0217008.HXP, 0217008.MXP, and 0617008.MXP fuses satisfy all primary substitution requirements with identical 8 A, 250 V, 5mm x 20mm specifications. These parts carry extensive approval certifications including BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, and VDE. The 217 series parts feature a melting I²t of 198.16 and operate across -55°C to 125°C. The 617 series part (0617008.MXP) carries approvals from CE, UR, and VDE with the same thermal and electrical characteristics. Selection from this group is appropriate for applications requiring broad international compliance or Littelfuse supply chain requirements.

OptiFuse (FSC and FSD Series): The FSC-8A and FSD-8A fuses meet all primary substitution criteria. The FSC-8A carries cULus and UL 248 approvals with a 200 A breaking capacity and operates across -55°C to 90°C. The FSD-8A carries cURus and IEC 60127 approvals with a 35 A breaking capacity and operates across -55°C to 125°C. Selection from this group is appropriate for applications requiring OptiFuse supply chain integration or specific UL/IEC compliance profiles.

Frequently Asked Questions (FAQ)

Q: Can I substitute any of these parts directly into a GDB-8A fuse holder?

A: Yes. All listed substitute parts share identical mechanical dimensions (5mm x 20mm) and mounting requirements (requires holder). Direct physical installation is compatible across all parts listed.

Q: What is the primary difference between these substitute parts?

A: The primary electrical and mechanical specifications (8 A, 250 V, 5mm x 20mm, fast-blow response) are identical across all parts. Secondary differences include breaking capacity, DC cold resistance, melting I²t, operating temperature range, and approval agency certifications. These secondary parameters do not affect substitution eligibility but may influence selection based on application-specific requirements.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts carry ROHS3 compliance status. The GDB-8A does not specify RoHS status in the provided data.

Q: Do all substitute parts have the same approval certifications?

A: No. Approval certifications vary by manufacturer and part number. The GDB-8A carries VDE and UR approvals. Eaton S500 series parts carry BSI, CSA, cULus, SEMKO, and VDE approvals. Littelfuse 217 series parts carry BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, and VDE approvals. OptiFuse parts carry cULus, UL 248, or cURus and IEC 60127 approvals. Selection should align with application-specific compliance requirements.

Q: What is the difference between the Eaton GDB and S500 series?

A: Both series meet identical electrical and mechanical specifications for the 8 A, 250 V application. The S500 series carries broader approval certifications (BSI, CSA, cULus, SEMKO, VDE) compared to the GDB series (VDE, UR). Both are active products from Eaton - Electronics Division.

Q: Can I use the FSC-8A or FSD-8A in place of the GDB-8A?

A: Yes. Both OptiFuse parts meet all primary substitution criteria (8 A, 250 V, 5mm x 20mm, fast-blow, cartridge glass, requires holder). The FSC-8A features a higher breaking capacity (200 A) and operates to 90°C. The FSD-8A features a lower breaking capacity (35 A) and operates to 125°C. Selection depends on application-specific breaking capacity and temperature requirements.

Q: What does "breaking capacity" mean in the context of fuse selection?

A: Breaking capacity is the maximum fault current the fuse can safely interrupt at its rated voltage. The GDB-8A has an 80 A breaking capacity. Substitute parts range from 35 A (FSD-8A) to 200 A (FSC-8A). Application requirements determine the appropriate breaking capacity.

Q: Are there inventory considerations when selecting a substitute?

A: Inventory levels vary by part number and manufacturer. The provided data indicates current stock availability for all parts. Procurement decisions should account for supply chain lead times and inventory status specific to your supplier.

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