GDB-315MA Equivalent & Substitute Parts

Part Overview

The GDB-315MA is a 315 mA fast-blow glass fuse cartridge rated for 250 V AC/DC operation in a 5mm x 20mm package. Manufactured by Eaton - Electronics Division, this component requires a compatible fuse holder for installation. The part maintains active product status with 661 units in current inventory. Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and application-specific compliance requirements across multiple manufacturers and series designations.

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)

Substitute Part Grouping Explanation

Substitution eligibility for the GDB-315MA is determined by strict equivalence across the following critical parameters: current rating (315 mA), voltage rating (250 V AC), fuse type (cartridge glass), response time (fast blow), and physical package dimensions (5mm x 20mm). All identified substitute parts match these core electrical and mechanical specifications, ensuring direct functional interchangeability within applications designed for the GDB-315MA.

Secondary parameters including melting I²t, DC cold resistance, approval agencies, and RoHS compliance status vary among substitutes. These variations reflect different manufacturing processes and certification scopes but do not affect the primary protective function when applied within the rated electrical parameters. Substitutes are sourced from Eaton - Electronics Division (multiple series), SCHURTER Inc., Littelfuse Inc., and OptiFuse, providing options across different supply channels and regulatory certifications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Current Rating (mA)	Voltage Rating (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Approval Agency	RoHS Status	Inventory (Pcs)
GDB-315MA	Eaton - Electronics Division	GDB	315	250	Fast Blow	5mm x 20mm	35	0.58	3.1	VDE, UR	Not Specified	661
BK/GDB-315MA	Eaton - Electronics Division	GDB	315	250	Fast Blow	5mm x 20mm	35	0.58	3.1	UL, VDE	RoHS Compliant	1042
BK/GMA-315-R	Eaton - Electronics Division	GMA	315	250	Fast Blow	5mm x 20mm	35	0.019	0.839	CSA, PSE, UL	ROHS3 Compliant	4682
BK/S500-315-R	Eaton - Electronics Division	S500	315	250	Fast Blow	5mm x 20mm	35	0.58	3.1	BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE	ROHS3 Compliant	1948
BK1/S500-315-R	Eaton - Electronics Division	S500	315	250	Fast Blow	5mm x 20mm	35	0.58	3.1	BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE	ROHS3 Compliant	1924
S500-315-R	Eaton - Electronics Division	S500	315	250	Fast Blow	5mm x 20mm	35	0.58	3.1	BSI, CCC, CSA, cURus, IMQ, SEMKO, VDE	ROHS3 Compliant	843
0034.1511	SCHURTER Inc.	FSF 5x20	315	250	Fast Blow	5mm x 20mm	35	0.0367	Not Specified	CCC, cURus, VDE	ROHS3 Compliant	1700
0217.315HXP	Littelfuse Inc.	217	315	250	Fast Blow	5mm x 20mm	35	0.11	0.88	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE	ROHS3 Compliant	1078
0217.315MXP	Littelfuse Inc.	217	315	250	Fast Blow	5mm x 20mm	35	0.11	0.88	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE	ROHS3 Compliant	9856
0217.315TXP	Littelfuse Inc.	217	315	250	Fast Blow	5mm x 20mm	35	0.11	0.88	CCC, CE, CSA, KC, SEMKO, UL, VDE	ROHS3 Compliant	1135
FSC-315MA	OptiFuse	FSC	315	250	Fast Blow	5mm x 20mm	100	Not Specified	0.04247	cULus, UL 248	ROHS3 Compliant	1333

Engineering Selection Recommendations

All substitute parts listed maintain active product status and are available in current inventory. Selection among equivalents should be based on application-specific certification requirements and supply chain considerations.

Eaton - Electronics Division Options (GDB, GMA, S500 Series): The BK/GDB-315MA provides direct series equivalence with expanded certification (UL addition) and RoHS compliance. The S500 series variants (BK/S500-315-R, BK1/S500-315-R, S500-315-R) offer the broadest international approval scope including BSI, CCC, CSA, cULus, IMQ, SEMKO, and VDE, supporting global applications. The BK/GMA-315-R variant features reduced melting I²t (0.019) and lower DC cold resistance (0.839 Ohms), reflecting different thermal characteristics within the same electrical ratings.

SCHURTER Inc. Option (0034.1511): The FSF 5x20 series part provides CCC, cURus, and VDE certifications with ROHS3 compliance. Operating temperature range extends to -55°C ~ 125°C, supporting wider environmental applications.

Littelfuse Inc. Options (0217 Series): The 0217.315HXP, 0217.315MXP, and 0217.315TXP variants offer comprehensive international certifications (CCC, CE, CSA, SEMKO, UL, VDE) with extended operating temperature range (-55°C ~ 125°C). The 0217.315MXP maintains the highest inventory level (9856 units), supporting consistent supply availability. All three variants share identical electrical parameters with melting I²t of 0.11 and DC cold resistance of 0.88 Ohms.

OptiFuse Option (FSC-315MA): The FSC series provides the highest breaking capacity (100A) with cULus and UL 248 certifications. Operating temperature range is -55°C ~ 90°C. The significantly lower DC cold resistance (0.04247 Ohms) distinguishes this option for applications sensitive to resistance characteristics.

Frequently Asked Questions (FAQ)

Q: Can GDB-315MA be directly replaced with any listed substitute part?

A: Yes. All substitute parts match the critical electrical parameters (315 mA current rating, 250 V AC voltage rating, fast-blow response, 5mm x 20mm package) and breaking capacity (35A minimum). Physical dimensions and mounting requirements are identical, enabling direct installation in existing fuse holders designed for the GDB-315MA.

Q: What is the significance of different melting I²t values among substitutes?

A: Melting I²t represents the thermal energy required to melt the fuse element. Variations (ranging from 0.0367 to 0.58 across substitutes) reflect different internal construction and material composition. All parts maintain the same current rating and response time classification. Selection should align with circuit protection requirements and thermal coordination with upstream protective devices.

Q: Are all substitutes RoHS compliant?

A: All listed substitutes carry RoHS3 compliance status or equivalent. The original GDB-315MA does not specify RoHS status. Substitutes BK/GDB-315MA, BK/GMA-315-R, BK/S500-315-R, BK1/S500-315-R, S500-315-R, 0034.1511, 0217.315HXP, 0217.315MXP, 0217.315TXP, and FSC-315MA all meet ROHS3 or RoHS Compliant requirements.

Q: Which substitute offers the broadest international certification coverage?

A: The S500 series variants (BK/S500-315-R, BK1/S500-315-R, S500-315-R) provide the most comprehensive approval scope: BSI, CCC, CSA, cULus, IMQ, SEMKO, and VDE. These certifications support applications across North America, Europe, Asia-Pacific, and other regulated markets.

Q: What is the difference between 0217.315HXP, 0217.315MXP, and 0217.315TXP?

A: All three Littelfuse 217 series variants share identical electrical specifications (315 mA, 250 V, fast-blow, 5mm x 20mm, melting I²t 0.11, DC cold resistance 0.88 Ohms). Differences exist in approval agency scope: 0217.315HXP includes K-MARK; 0217.315TXP includes KC. The 0217.315MXP maintains the highest inventory availability (9856 units). Selection should be based on specific regional certification requirements.

Q: How does the OptiFuse FSC-315MA differ from other substitutes?

A: The FSC-315MA features a significantly higher breaking capacity (100A versus 35A for other substitutes) and substantially lower DC cold resistance (0.04247 Ohms). These characteristics make it suitable for applications requiring enhanced fault current handling or where resistance characteristics are critical to circuit performance. Certifications are limited to cULus and UL 248, with operating temperature range of -55°C ~ 90°C.

Q: Can substitutes be mixed within the same application?

A: All substitutes are electrically and mechanically equivalent for the rated 315 mA, 250 V AC/DC application. However, mixing different part numbers within a single circuit or system is not recommended without verification that the specific approval certifications and thermal characteristics align with the complete system design and regulatory requirements.

Q: What inventory considerations should guide substitute selection?

A: Current inventory levels vary significantly: 0217.315MXP (9856 units), BK/GMA-315-R (4682 units), BK/S500-315-R (1948 units), BK1/S500-315-R (1924 units), 0034.1511 (1700 units), FSC-315MA (1333 units), 0217.315TXP (1135 units), 0217.315HXP (1078 units), BK/GDB-315MA (1042 units), S500-315-R (843 units), and GDB-315MA (661 units). Higher inventory levels support longer-term supply continuity and reduced lead times.

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