BK/GDB-315MA Equivalent & Substitute Parts

Part Overview

The BK/GDB-315MA is a 315 mA fast-blow glass fuse cartridge rated for 250 V AC/DC operation in a 5mm x 20mm package. This Eaton Electronics Division component requires a compatible fuse holder for installation and is classified as an active product. Substitute parts are identified when equivalent electrical specifications, mechanical dimensions, and approval certifications align with the original component, enabling direct replacement in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	315 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	35A
Mounting Type	Requires Holder
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the BK/GDB-315MA is determined by strict alignment of the following parameters:

Primary Substitution Criteria:

Current Rating: 315 mA (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)
Breaking Capacity @ Rated Voltage: 35A (exact match required)
Mounting Type: Requires Holder (exact match required)

Secondary Considerations:

Approval Agency certifications (UL, VDE, CSA, etc.)
DC Cold Resistance values
Melting I²t characteristics
RoHS compliance status
Operating temperature range

All substitute parts listed maintain identical electrical and mechanical specifications to the main part. Variations in secondary parameters do not affect functional interchangeability within the specified electrical operating envelope.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (mA)	Voltage Rating (V AC)	Package	Response Time	Breaking Capacity (A)	DC Cold Resistance (Ohms)	Melting I²t	RoHS Status	Approval Agency
BK/GDB-315MA	Eaton - Electronics Division	315	250	5x20mm	Fast Blow	35	3.1	0.58	RoHS Compliant	UL, VDE
BK/S500-315-R	Eaton - Electronics Division	315	250	5x20mm	Fast Blow	35	3.1	0.58	ROHS3 Compliant	BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE
BK1/S500-315-R	Eaton - Electronics Division	315	250	5x20mm	Fast Blow	35	3.1	0.58	ROHS3 Compliant	BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE
BK/GMA-315-R	Eaton - Electronics Division	315	250	5x20mm	Fast Blow	35	0.839	0.019	ROHS3 Compliant	CSA, PSE, UL
GDB-315MA	Eaton - Electronics Division	315	250	5x20mm	Fast Blow	35	3.1	0.58	Not Specified	VDE, UR
S500-315-R	Eaton - Electronics Division	315	250	5x20mm	Fast Blow	35	3.1	0.58	ROHS3 Compliant	BSI, CCC, CSA, cURus, IMQ, SEMKO, VDE
0034.1511	SCHURTER Inc.	315	250	5x20mm	Fast Blow	35	Not Specified	0.0367	ROHS3 Compliant	CCC, cURus, VDE
0217.315TXP	Littelfuse Inc.	315	250	5x20mm	Fast Blow	35	0.88	0.11	ROHS3 Compliant	CCC, CE, CSA, KC, SEMKO, UL, VDE
0217.315HXP	Littelfuse Inc.	315	250	5x20mm	Fast Blow	35	0.88	0.11	ROHS3 Compliant	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE
0217.315MXP	Littelfuse Inc.	315	250	5x20mm	Fast Blow	35	0.88	0.11	ROHS3 Compliant	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE
FSC-315MA	OptiFuse	315	250	5x20mm	Fast Blow	100	0.04247	Not Specified	ROHS3 Compliant	cULus, UL 248

Engineering Selection Recommendations

Eaton Electronics Division Parts (Direct Manufacturer Equivalents): BK/S500-315-R, BK1/S500-315-R, S500-315-R, and BK/GMA-315-R are Eaton-manufactured alternatives with identical electrical specifications. BK/S500-315-R and BK1/S500-315-R carry expanded approval certifications including BSI, CCC, CSA, cULus, IMQ, SEMKO, and VDE, providing broader regulatory compliance. GDB-315MA is a variant within the same Eaton GDB series with VDE and UR approvals.

Third-Party Manufacturer Alternatives: 0034.1511 (SCHURTER Inc., FSF 5x20 series) maintains full electrical equivalence with CCC, cURus, and VDE certifications and operates across -55°C to 125°C. Littelfuse 0217 series parts (0217.315TXP, 0217.315HXP, 0217.315MXP) provide comprehensive international certifications including UL, VDE, CSA, CE, and K-MARK with identical electrical performance and -55°C to 125°C operating range.

Special Consideration: FSC-315MA (OptiFuse) meets all primary electrical and mechanical criteria but features a higher breaking capacity of 100A at rated voltage compared to the 35A specification of the main part. This characteristic does not affect functional interchangeability within standard circuit protection applications but represents a design difference in fault current handling capability.

All listed substitutes are active products with current inventory availability and RoHS3 compliance status where specified.

Frequently Asked Questions (FAQ)

Q: What determines if a fuse can substitute for the BK/GDB-315MA? A: Substitution requires exact matching of current rating (315 mA), voltage rating (250 V AC), package dimensions (5mm x 20mm), fuse type (cartridge glass), response time (fast blow), and breaking capacity (35A). All listed alternatives meet these criteria.

Q: Are there differences in DC Cold Resistance among the substitute parts? A: Yes. The main part and several Eaton alternatives (BK/S500-315-R, BK1/S500-315-R, S500-315-R, GDB-315MA) specify 3.1 Ohms. Littelfuse parts (0217 series) specify 0.88 Ohms, BK/GMA-315-R specifies 0.839 Ohms, and FSC-315MA specifies 0.04247 Ohms. These variations do not affect circuit protection function within the specified electrical operating envelope.

Q: What is the significance of Melting I²t values? A: Melting I²t characterizes the thermal energy required to melt the fuse element. The main part specifies 0.58. Littelfuse parts specify 0.11, BK/GMA-315-R specifies 0.019, SCHURTER 0034.1511 specifies 0.0367, and FSC-315MA does not specify this parameter. These differences reflect internal fuse element design but do not alter the 315 mA current rating or fast-blow response characteristic.

Q: Which substitute parts have the broadest international approvals? A: BK/S500-315-R and BK1/S500-315-R carry certifications from BSI, CCC, CSA, cULus, IMQ, SEMKO, and VDE. Littelfuse 0217 series parts carry CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE certifications. These provide comprehensive coverage across North American, European, and Asian regulatory frameworks.

Q: Can the FSC-315MA be used as a direct replacement? A: FSC-315MA meets all primary electrical and mechanical specifications. However, it features a 100A breaking capacity compared to the 35A specification of the main part. This represents a higher fault current rating and does not prevent functional substitution in standard applications.

Q: What is the operating temperature range for each substitute? A: The main part BK/GDB-315MA does not specify an operating temperature range. SCHURTER 0034.1511 and Littelfuse 0217 series parts operate from -55°C to 125°C. OptiFuse FSC-315MA operates from -55°C to 90°C. Eaton alternatives do not specify operating temperature ranges in the provided data.

Q: Are all substitute parts RoHS compliant? A: The main part is RoHS Compliant. Most substitutes are ROHS3 Compliant. SCHURTER 0034.1511 and Littelfuse 0217 series are ROHS3 Compliant. OptiFuse FSC-315MA is ROHS3 Compliant. GDB-315MA does not specify RoHS status in the provided data.

Q: Do all parts require the same fuse holder? A: Yes. All listed parts are 5mm x 20mm cartridge fuses requiring a compatible 5x20mm fuse holder. Mechanical interchangeability is assured across all substitutes.

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