Equivalent & Substitute Parts for BK/GDC-315MA

Part Overview

The BK/GDC-315MA is a 315 mA, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm package format manufactured by Eaton - Electronics Division. This fuse requires a holder for installation and is classified as Active product status. Equivalent and substitute parts are identified when identical electrical and mechanical parameters are maintained across the same package class, enabling direct functional replacement 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
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 BK/GDC-315MA is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

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

Secondary Considerations:

Mounting Type: Requires Holder (consistent across all substitutes)
Physical Dimensions: 0.205" Dia x 0.787" L (5.20mm x 20.00mm) (exact match required)

Substitute parts are grouped into two categories: Direct Manufacturer Equivalents (same electrical and mechanical specifications from alternative manufacturers) and Parametric Equivalents (same electrical specifications with variations in secondary parameters such as melting I²t, DC cold resistance, or approval agencies).

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (mA)	Voltage (V AC)	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	RoHS Status	Approval Agencies
BK/GDC-315MA	Eaton - Electronics Division	GDC	315	250	Slow Blow	35	0.621	0.45	RoHS Compliant	cULus, IMQ
BK/S506-315-R	Eaton - Electronics Division	S506	315	250	Slow Blow	35	0.621	0.45	ROHS3 Compliant	BSI, CCC, CSA, IMQ, SEMKO, UR, VDE
BK/GMD-315-R	Eaton - Electronics Division	GMD	315	250	Slow Blow	35	0.89	2.4	ROHS3 Compliant	CSA, UL
BK1/S506-315-R	Eaton - Electronics Division	S506	315	250	Slow Blow	35	0.621	0.45	ROHS3 Compliant	BSI, CCC, CSA, IMQ, SEMKO, UR, VDE
S506-315-R	Eaton - Electronics Division	S506	315	250	Slow Blow	35	0.621	0.45	ROHS3 Compliant	BSI, CCC, CSA, IMQ, SEMKO, UR, VDE
0034.3112	SCHURTER Inc.	FST 5x20	315	250	Slow Blow	35	0.544	Not Specified	ROHS3 Compliant	CCC, cURus, VDE
0218.315MXP	Littelfuse Inc.	218	315	250	Slow Blow	35	1.11	0.8475	ROHS3 Compliant	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE
0218.315TXP	Littelfuse Inc.	218	315	250	Slow Blow	35	1.11	0.8475	ROHS3 Compliant	CCC, CE, CSA, KC, SEMKO, UL, VDE
0213.315MXP	Littelfuse Inc.	213	315	250	Slow Blow	35	1.14	0.8475	ROHS3 Compliant	BSI, CCC, CE, CSA, SEMKO, UR, VDE
0034.3769	SCHURTER Inc.	FSL 5x20	315	250	Slow Blow	35	0.345	Not Specified	ROHS3 Compliant	cULus
0034.5038	SCHURTER Inc.	FTT 5x20	315	250	Slow Blow	35	4.17	Not Specified	ROHS3 Compliant	cURus

Engineering Selection Recommendations

Direct Eaton Equivalents (Recommended for Seamless Replacement):

The BK/S506-315-R, BK1/S506-315-R, and S506-315-R from Eaton - Electronics Division maintain identical electrical specifications (315 mA, 250 V AC, 0.621 melting I²t, 0.45 Ohms DC cold resistance) and are classified as Active product status. These parts carry expanded approval certifications including BSI, CCC, CSA, IMQ, SEMKO, UR, and VDE, providing broader regulatory compliance than the original BK/GDC-315MA.

Eaton Parametric Equivalent:

The BK/GMD-315-R from Eaton maintains core electrical parameters but exhibits different melting I²t (0.89 versus 0.621) and DC cold resistance (2.4 Ohms versus 0.45 Ohms). This part is suitable for applications where thermal response characteristics differ from the original specification. Approval agencies are limited to CSA and UL.

Third-Party Direct Equivalents:

SCHURTER Inc. part 0034.3112 (FST 5x20 series) and Littelfuse Inc. parts 0218.315MXP, 0218.315TXP, and 0213.315MXP maintain the required 315 mA, 250 V AC, 35A breaking capacity, and 5mm x 20mm package specifications. These parts carry ROHS3 compliance and multiple international certifications. Melting I²t values vary (0.544 to 1.14), reflecting different thermal response profiles within the slow-blow classification.

Parametric Equivalents with Modified Thermal Response:

SCHURTER parts 0034.3769 (FSL 5x20, melting I²t 0.345) and 0034.5038 (FTT 5x20, melting I²t 4.17) maintain electrical ratings but provide faster and slower thermal response respectively. Selection depends on circuit-specific thermal requirements.

All substitute parts are Active product status and ROHS3 compliant, ensuring current manufacturing availability and environmental compliance.

Frequently Asked Questions (FAQ)

Q: Can BK/S506-315-R be used as a direct replacement for BK/GDC-315MA?

A: Yes. Both parts share identical current rating (315 mA), voltage rating (250 V AC), response time (Slow Blow), breaking capacity (35A), package dimensions (5mm x 20mm), melting I²t (0.621), and DC cold resistance (0.45 Ohms). The BK/S506-315-R carries additional regulatory certifications (BSI, CCC, SEMKO, UR, VDE) beyond the original part.

Q: What is the difference between melting I²t values in the substitute parts?

A: Melting I²t is a thermal characteristic that defines the fuse's response to overcurrent conditions. The BK/GDC-315MA and direct Eaton equivalents (BK/S506-315-R, BK1/S506-315-R, S506-315-R) share a melting I²t of 0.621. Parametric equivalents from SCHURTER and Littelfuse exhibit different values (ranging from 0.345 to 4.17), indicating variations in thermal response time while maintaining the same current and voltage ratings. Selection should be based on circuit protection requirements.

Q: Are all substitute parts available in the same 5mm x 20mm package?

A: Yes. All listed substitute parts conform to the 5mm x 20mm package specification (0.205" Dia x 0.787" L), ensuring mechanical compatibility with existing fuse holders.

Q: What regulatory certifications should I prioritize when selecting a substitute?

A: Selection depends on application requirements. The BK/S506-315-R series carries the broadest certification coverage (BSI, CCC, CSA, IMQ, SEMKO, UR, VDE). Littelfuse parts (0218.315MXP, 0218.315TXP, 0213.315MXP) include CE marking and K-MARK/KC certifications suitable for European and Korean markets. SCHURTER parts (0034.3112, 0034.3769, 0034.5038) carry cULus or cURus certifications for North American applications.

Q: Do all substitute parts require a holder for installation?

A: Yes. All listed substitute parts are classified as Cartridge, Glass fuses requiring a holder. Physical installation method remains identical to the BK/GDC-315MA.

Q: What is the difference between ROHS and ROHS3 compliance?

A: The original BK/GDC-315MA carries RoHS Compliant status. Most substitute parts carry ROHS3 Compliant status, indicating compliance with the updated Restriction of Hazardous Substances Directive. Both designations confirm absence of restricted materials; ROHS3 represents the current regulatory standard.

Q: Can I use 0034.3769 or 0034.5038 if my circuit requires faster or slower fuse response?

A: These SCHURTER parts maintain the 315 mA, 250 V AC, 35A specifications but exhibit different melting I²t values (0.345 and 4.17 respectively). Selection should be confirmed against circuit design specifications. The melting I²t parameter directly affects thermal response characteristics.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message