GDC-315MA Equivalent & Substitute Parts

Part Overview

The GDC-315MA is a 315 mA slow blow glass cartridge fuse rated for 250 V AC/DC operation in a 5mm x 20mm package form factor. This fuse requires a compatible holder for installation and is designed for circuit protection applications requiring delayed response characteristics. The part is active in production status with 799 units in current inventory stock. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical dimensions, and functional performance parameters to ensure direct interchangeability in circuit protection applications.

Key Parameters

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

Substitute Part Grouping Explanation

Substitute parts for the GDC-315MA are qualified based on the following critical parameters that determine functional interchangeability:

Primary Matching Criteria:

Current Rating: 315 mA (exact match required)
Voltage Rating: 250 V AC (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Breaking Capacity @ Rated Voltage: 35A (exact match required)

Secondary Considerations:

Mounting Type: Requires Holder (consistent across all substitutes)
Approval Agencies: Certifications must be present for intended application regions
RoHS and REACH Compliance: Environmental regulatory status

Parts that deviate from primary matching criteria in current rating, voltage rating, package dimensions, or breaking capacity are not suitable substitutes and do not appear in this reference.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Current Rating (Amps)	Voltage Rating - AC (V)	Response Time	Package / Case	Breaking Capacity @ Rated Voltage (A)	Melting I²t	DC Cold Resistance (Ohms)	Approval Agency	Product Status
GDC-315MA	Eaton - Electronics Division	GDC	0.315	250	Slow Blow	5mm x 20mm	35	0.621	0.45	cURus, IMQ	Active
BK/GMD-315-R	Eaton - Electronics Division	GMD	0.315	250	Slow Blow	5mm x 20mm	35	0.89	2.4	CSA, UL	Active
BK/S506-315-R	Eaton - Electronics Division	S506	0.315	250	Slow Blow	5mm x 20mm	35	0.621	0.45	BSI, CCC, CSA, IMQ, SEMKO, UR, VDE	Active
BK1/S506-315-R	Eaton - Electronics Division	S506	0.315	250	Slow Blow	5mm x 20mm	35	0.621	0.45	BSI, CCC, CSA, IMQ, SEMKO, UR, VDE	Active
S506-315-R	Eaton - Electronics Division	S506	0.315	250	Slow Blow	5mm x 20mm	35	0.621	0.45	BSI, CCC, CSA, IMQ, SEMKO, UR, VDE	Active
0034.3112	SCHURTER Inc.	FST 5x20	0.315	250	Slow Blow	5mm x 20mm	35	0.544	Not Specified	CCC, cURus, VDE	Active
0034.3769	SCHURTER Inc.	FSL 5x20	0.315	250	Slow Blow	5mm x 20mm	35	0.345	Not Specified	cULus	Active
0034.5038	SCHURTER Inc.	FTT 5x20	0.315	250	Slow Blow	5mm x 20mm	35	4.17	Not Specified	cURus	Active
0034.5612.11	SCHURTER Inc.	SMD-FST	0.315	250	Slow Blow	5mm x 20mm	35	0.544	Not Specified	cURus, VDE	Active
0034.5708.11	SCHURTER Inc.	SMD-FTT	0.315	250	Slow Blow	5mm x 20mm	35	4.17	Not Specified	cURus	Active
0218.315MXP	Littelfuse Inc.	218	0.315	250	Slow Blow	5mm x 20mm	35	1.11	0.8475	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE	Active

Engineering Selection Recommendations

All substitute parts listed are active production items with equivalent electrical and mechanical specifications to the GDC-315MA. Selection among substitutes is determined by application-specific certification requirements and regional compliance mandates.

Eaton Electronics Division Substitutes (GDC Series Alternatives):

BK/S506-315-R, BK1/S506-315-R, and S506-315-R provide the broadest international certification coverage including BSI, CCC, CSA, IMQ, SEMKO, UR, and VDE approvals. These parts maintain identical melting I²t (0.621) and DC cold resistance (0.45 Ohms) to the GDC-315MA.
BK/GMD-315-R offers CSA and UL certifications with higher melting I²t (0.89) and DC cold resistance (2.4 Ohms), suitable for applications requiring UL compliance in North American markets.

SCHURTER Inc. Substitutes:

0034.3112 (FST 5x20) and 0034.5612.11 (SMD-FST) provide identical melting I²t (0.544) with cURus and VDE certifications.
0034.3769 (FSL 5x20) features lower melting I²t (0.345) with cULus certification for North American applications.
0034.5038 (FTT 5x20) and 0034.5708.11 (SMD-FTT) provide higher melting I²t (4.17) with cURus certification for applications requiring extended thermal response.

Littelfuse Inc. Substitute:

0218.315MXP (Series 218) offers comprehensive international certifications (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE) with melting I²t of 1.11 and DC cold resistance of 0.8475 Ohms.

Selection should be based on the specific certification requirements of the target application region and any thermal response characteristics required by the circuit design.

Frequently Asked Questions (FAQ)

Q: What determines if a part can substitute for the GDC-315MA?

A: A substitute part must match the GDC-315MA in the following parameters: 315 mA current rating, 250 V AC voltage rating, 5mm x 20mm package dimensions, cartridge glass fuse type, slow blow response time, and 35A breaking capacity at rated voltage. All listed substitutes meet these criteria.

Q: Are there differences in melting I²t values among the substitutes, and does this affect interchangeability?

A: Yes, melting I²t values vary among substitutes (ranging from 0.345 to 4.17). While all parts meet the 315 mA current rating and 250 V voltage specification, different melting I²t values indicate different thermal response characteristics. The melting I²t parameter defines the thermal energy required to melt the fuse element. Parts with identical melting I²t to the GDC-315MA (0.621) include BK/S506-315-R, BK1/S506-315-R, and S506-315-R. Parts with different melting I²t values provide alternative thermal response profiles suitable for different circuit protection strategies.

Q: What is the significance of DC cold resistance differences?

A: DC cold resistance affects the voltage drop across the fuse during normal operation. The GDC-315MA has 0.45 Ohms DC cold resistance. Substitutes with identical resistance (BK/S506-315-R, BK1/S506-315-R, S506-315-R) provide equivalent voltage drop characteristics. The BK/GMD-315-R has higher resistance (2.4 Ohms) and 0218.315MXP has 0.8475 Ohms. Selection should consider the circuit's tolerance for voltage drop across the fuse element.

Q: Do all substitutes have the same approval certifications?

A: No. The GDC-315MA carries cURus and IMQ certifications. Substitute parts have varying certification profiles: Eaton S506 series parts include BSI, CCC, CSA, IMQ, SEMKO, UR, and VDE; SCHURTER parts include combinations of CCC, cURus, VDE, and cULus; Littelfuse 0218.315MXP includes CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE. Selection must align with the certifications required for the target application region.

Q: Can I use a substitute with different melting I²t if the current and voltage ratings match?

A: All listed substitutes are qualified as electrical and mechanical equivalents based on matching current rating (315 mA), voltage rating (250 V), package dimensions (5mm x 20mm), and breaking capacity (35A). However, the melting I²t parameter defines the thermal response behavior of the fuse. Parts with different melting I²t values will exhibit different trip times under overload conditions. Selection of a substitute with different melting I²t should be based on whether the circuit design requires the alternative thermal response characteristics.

Q: Are all substitute parts RoHS3 compliant?

A: Most substitute parts are RoHS3 compliant. The GDC-315MA does not specify RoHS status. Among substitutes, BK/S506-315-R, BK1/S506-315-R, S506-315-R, and all SCHURTER and Littelfuse parts listed are confirmed RoHS3 compliant. BK/GMD-315-R does not specify RoHS status. Verify RoHS compliance requirements for your specific application before final part selection.

Q: What is the difference between the S506-315-R variants (S506-315-R, BK/S506-315-R, BK1/S506-315-R)?

A: All three variants (S506-315-R, BK/S506-315-R, BK1/S506-315-R) are from the Eaton S506 series and share identical electrical specifications: 315 mA, 250 V, 5mm x 20mm package, 0.621 melting I²t, 0.45 Ohms DC cold resistance, and BSI, CCC, CSA, IMQ, SEMKO, UR, VDE certifications. The designations BK/ and BK1/ represent packaging or configuration variants of the base S506-315-R part. All three are functionally equivalent for circuit protection applications.

Q: How do SCHURTER FST, FSL, and FTT series differ?

A: SCHURTER provides three thermal response variants within the 315 mA, 250 V, 5mm x 20mm specification: FST (0034.3112) with melting I²t of 0.544, FSL (0034.3769) with melting I²t of 0.345, and FTT (0034.5038) with melting I²t of 4.17. These represent fast, fast-low, and time-delay response characteristics respectively. Selection depends on the circuit's overload protection requirements and acceptable trip time window.

Q: Is the GDC-315MA still in production?

A: Yes, the GDC-315MA is active in production status with 799 units in current inventory stock. All listed substitute parts are also active production items with available inventory ranging from 777 to 8839 units.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message