BK/GDB-8A Equivalent & Substitute Parts

Part Overview

The BK/GDB-8A is an 8 A, 250 V AC/DC fast-blow glass cartridge fuse with a 5mm x 20mm form factor manufactured by Eaton - Electronics Division. This fuse is designed for circuits requiring holder-based mounting and operates at a breaking capacity of 80 A at rated voltage. The part is currently active in production with 707 units in stock.

Equivalent and substitute parts are identified when applications require alternative sourcing due to inventory availability, supply chain considerations, or when design specifications permit interchangeability based on electrical and mechanical parameters. All substitute parts listed maintain identical or compatible electrical ratings, physical dimensions, and functional characteristics.

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
Mounting Type	Requires Holder
DC Cold Resistance	0.01 Ohms
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the BK/GDB-8A is determined by the following critical 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 identified in this reference maintain these core electrical and mechanical specifications. Variations in secondary parameters such as breaking capacity, DC cold resistance, melting I²t, approval agencies, and operating temperature ranges do not preclude substitution when the primary criteria are satisfied.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Package / Case	Response Time	Breaking Capacity @ Rated Voltage (A)	DC Cold Resistance (Ohms)	RoHS Status	Product Status
BK/GDB-8A	Eaton - Electronics Division	8	250	5mm x 20mm	Fast Blow	80	0.01	RoHS Compliant	Active
BK/S500-8-R	Eaton - Electronics Division	8	250	5mm x 20mm	Fast Blow	80	0.01	ROHS3 Compliant	Active
BK1/S500-8-R	Eaton - Electronics Division	8	250	5mm x 20mm	Fast Blow	80	0.01	ROHS3 Compliant	Active
S500-8-R	Eaton - Electronics Division	8	250	5mm x 20mm	Fast Blow	80	0.01	ROHS3 Compliant	Active
0034.1525	SCHURTER Inc.	8	250	5mm x 20mm	Fast Blow	80	Not Specified	ROHS3 Compliant	Active
0217008.MXP	Littelfuse Inc.	8	250	5mm x 20mm	Fast Blow	80	0.0068	ROHS3 Compliant	Active
0217008.HXP	Littelfuse Inc.	8	250	5mm x 20mm	Fast Blow	80	0.0068	ROHS3 Compliant	Active
0617008.MXP	Littelfuse Inc.	8	250	5mm x 20mm	Fast Blow	80	0.0068	ROHS3 Compliant	Active
FSC-8A	OptiFuse	8	250	5mm x 20mm	Fast Blow	200	100	ROHS3 Compliant	Active
FSD-8A	OptiFuse	8	250	5mm x 20mm	Fast Blow	35	Not Specified	ROHS3 Compliant	Active

Engineering Selection Recommendations

All substitute parts listed are active products with current manufacturing status. Selection among equivalent parts should be based on the following factors:

Eaton - Electronics Division Series (BK/S500-8-R, BK1/S500-8-R, S500-8-R): These parts maintain identical electrical specifications to the BK/GDB-8A and represent direct manufacturer alternatives within the same product family. All three variants are ROHS3 compliant and carry expanded approval agency certifications including BSI, CSA, cULus, and SEMKO.

SCHURTER Inc. (0034.1525): This part meets all primary substitution criteria and carries VDE, cURus, and PSE/JET approvals. Operating temperature range extends to -55°C to 125°C, providing broader environmental capability.

Littelfuse Inc. (0217008.MXP, 0217008.HXP, 0617008.MXP): These parts satisfy all core electrical and mechanical requirements with comprehensive approval agency coverage including BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, and VDE. The 0217008 series variants (MXP and HXP) are functionally equivalent. The 0617008.MXP variant carries reduced approval agency scope (CE, UR, VDE only) and should be selected only when these certifications are sufficient for the application.

OptiFuse (FSC-8A, FSD-8A): Both parts maintain the required 8 A, 250 V, 5mm x 20mm specifications. The FSC-8A carries cULus and UL 248 approvals with a 200 A breaking capacity. The FSD-8A carries cURus and IEC 60127 approvals with a 35 A breaking capacity and melting I²t of 185.6. Selection between these variants depends on specific approval agency requirements for the end application.

Frequently Asked Questions (FAQ)

Q: Can BK/GDB-8A be directly replaced with BK/S500-8-R?

A: Yes. Both parts are manufactured by Eaton - Electronics Division and maintain identical electrical ratings (8 A, 250 V AC), response time (fast blow), package dimensions (5mm x 20mm), and breaking capacity (80 A). The primary difference is enhanced RoHS compliance status (ROHS3 vs. RoHS Compliant) and expanded approval agency certifications on the S500 series.

Q: What is the difference between Littelfuse 0217008.MXP and 0217008.HXP?

A: Both parts are parametric equivalents with identical electrical specifications, DC cold resistance (0.0068 Ohms), melting I²t (198.16), and approval agencies. The designation difference (MXP vs. HXP) reflects packaging or internal construction variants that do not affect electrical or mechanical interchangeability.

Q: Are OptiFuse FSC-8A and FSD-8A interchangeable with BK/GDB-8A?

A: Both OptiFuse parts meet the primary substitution criteria of 8 A current rating, 250 V voltage rating, 5mm x 20mm package, fast-blow response, and holder-based mounting. However, they differ in breaking capacity (FSC-8A: 200 A, FSD-8A: 35 A) and approval agency certifications. Selection depends on whether the application requires the specific approval agencies listed for each variant.

Q: Does the DC cold resistance variation between parts affect substitution?

A: DC cold resistance is a secondary parameter. The BK/GDB-8A specifies 0.01 Ohms, while Littelfuse variants specify 0.0068 Ohms and OptiFuse FSC-8A specifies 100 Ohms. These variations do not preclude substitution when all primary criteria (current, voltage, package, response time) are met. Application-specific circuit analysis may determine if resistance variations are acceptable.

Q: What approval agencies are most commonly required?

A: The most comprehensive coverage is provided by Littelfuse 0217008.MXP and 0217008.HXP, which carry BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, and VDE approvals. For applications requiring UL certification, OptiFuse FSC-8A carries cULus and UL 248 approvals. For European applications, SCHURTER 0034.1525 carries VDE, cURus, and PSE/JET approvals.

Q: Can I use a substitute part with a higher breaking capacity?

A: Yes. OptiFuse FSC-8A has a 200 A breaking capacity compared to the BK/GDB-8A's 80 A. A higher breaking capacity does not compromise circuit protection and may provide additional safety margin. However, application-specific circuit requirements should be verified.

Q: Are all substitute parts currently in stock?

A: All substitute parts listed are active products with current inventory. Littelfuse 0217008.MXP has 4,067 units in stock, OptiFuse FSC-8A has 7,399 units, and BK1/S500-8-R has 2,422 units available. Inventory levels should be confirmed at time of procurement.

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