BK/S504-5A Equivalent & Substitute Parts

Part Overview

The BK/S504-5A is a 5 A, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Eaton - Electronics Division in a 5mm x 20mm package format. This component requires a fuse holder for installation and is classified as obsolete. Due to its obsolete product status, equivalent and substitute parts from active product lines are necessary to maintain system functionality and ensure continued availability for replacement applications.

Key Parameters

Parameter	Value
Current Rating	5 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)
Breaking Capacity @ Rated Voltage	35 A
Melting I²t	133
DC Cold Resistance	0.0095 Ohms
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the BK/S504-5A are grouped based on strict electrical and mechanical compatibility criteria. All substitute candidates must satisfy the following parameters:

Critical Matching Parameters:

Current Rating: 5 A
Voltage Rating (AC): 250 V
Fuse Type: Cartridge, Glass
Response Time: Slow Blow
Package / Case: 5mm x 20mm
Mounting Type: Requires Holder
Physical Dimensions: 0.205" Dia x 0.787" L (5.20mm x 20.00mm)

Substitution Categories:

Direct Manufacturer Equivalents (Eaton - Electronics Division): Parts BK/S506-5-R and S506-5-R are active-status alternatives from the same manufacturer with identical electrical and mechanical specifications. These parts feature improved breaking capacity (50 A versus 35 A) and enhanced regulatory compliance.

Parametric Equivalents (Eaton - Electronics Division): Parts BK/GDC-5A and GDC-5A meet all critical electrical and mechanical parameters with active product status and expanded approval agency certifications.

Cross-Manufacturer Parametric Equivalents: Littelfuse Inc., SCHURTER Inc., and other manufacturers provide glass cartridge fuses meeting the identical 5 A, 250 V, 5x20mm specification with active product status and RoHS3 compliance.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Product Status	RoHS Status
BK/S504-5A	Eaton	5	250	Slow Blow	5x20mm	35	133	0.0095	Obsolete	Non-compliant
BK/S506-5-R	Eaton	5	250	Slow Blow	5x20mm	50	142.5	0.00985	Active	ROHS3 Compliant
S506-5-R	Eaton	5	250	Slow Blow	5x20mm	50	142.5	0.00985	Active	ROHS3 Compliant
BK/GDC-5A	Eaton	5	250	Slow Blow	5x20mm	50	142.5	0.00985	Active	ROHS3 Compliant
GDC-5A	Eaton	5	250	Slow Blow	5x20mm	50	142.5	0.00985	Active	ROHS3 Compliant
0213005.MXP	Littelfuse	5	250	Slow Blow	5x20mm	50	314	0.0116	Active	ROHS3 Compliant
0218005.MXP	Littelfuse	5	250	Slow Blow	5x20mm	50	111	0.0104	Active	ROHS3 Compliant
0034.3124	SCHURTER	5	250	Slow Blow	5x20mm	50	102	Not Specified	Active	ROHS3 Compliant
0034.5624.11	SCHURTER	5	250	Slow Blow	5x20mm	50	102	Not Specified	Active	ROHS3 Compliant
0213005.MXBP	Littelfuse	5	250	Slow Blow	5x20mm	50	314	0.0116	Active	ROHS3 Compliant
0213005.TXP	Littelfuse	5	250	Slow Blow	5x20mm	50	314	0.0116	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Eaton Direct Equivalents:

BK/S506-5-R and S506-5-R are the preferred substitutes for the obsolete BK/S504-5A. Both parts are manufactured by Eaton - Electronics Division and maintain identical electrical and mechanical specifications. These parts offer improved breaking capacity (50 A versus 35 A), enhanced melting I²t characteristics (142.5 versus 133), and full RoHS3 compliance. Regulatory approvals include BSI, CCC, CSA, CURUS, IMQ, PSE/JET, SEMKO, and VDE.

Secondary Recommendation - Eaton GDC Series:

BK/GDC-5A and GDC-5A provide equivalent electrical and mechanical performance with active product status. These parts feature identical current, voltage, and package specifications with improved breaking capacity and RoHS3 compliance. Regulatory approvals include cULus, IMQ, and MITI/JET.

Cross-Manufacturer Alternatives:

Littelfuse 0213005.MXP, 0213005.MXBP, 0213005.TXP, and 0218005.MXP meet all critical electrical and mechanical parameters with active product status and RoHS3 compliance. These parts feature expanded operating temperature range (-55°C to 125°C) and comprehensive regulatory certifications including BSI, CCC, CE, CSA, PSE, SEMKO, UL, and VDE.

SCHURTER 0034.3124 and 0034.5624.11 provide equivalent performance with active product status, RoHS3 compliance, and operating temperature range of -55°C to 125°C. Regulatory approvals include CCC, cURus, PSE/JET, and VDE.

Compliance Considerations:

The original BK/S504-5A is RoHS non-compliant. All recommended substitutes are RoHS3 compliant, supporting modern regulatory requirements. Selection should prioritize parts with active product status to ensure long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can BK/S506-5-R directly replace BK/S504-5A?

A: Yes. BK/S506-5-R is a direct substitute meeting all electrical and mechanical specifications: 5 A current rating, 250 V AC voltage rating, slow-blow response, and 5x20mm package format. The part is manufactured by Eaton - Electronics Division with active product status and RoHS3 compliance.

Q: What is the difference between BK/S504-5A and BK/S506-5-R?

A: The primary differences are product status and performance characteristics. BK/S504-5A is obsolete with 35 A breaking capacity and 133 melting I²t. BK/S506-5-R is active with 50 A breaking capacity, 142.5 melting I²t, and RoHS3 compliance. Both maintain identical current, voltage, and package specifications.

Q: Are Littelfuse and SCHURTER fuses compatible with Eaton fuse holders?

A: Yes. All substitute parts maintain identical 5x20mm package dimensions and mounting requirements. Compatibility with existing fuse holders is ensured through adherence to standard cartridge fuse specifications.

Q: What is the significance of melting I²t values?

A: Melting I²t indicates the thermal energy required to melt the fuse element. Substitute parts with different I²t values (ranging from 102 to 314 in this comparison) maintain the same 5 A current rating and slow-blow response characteristic but exhibit different thermal response profiles. Selection should match the original I²t value for equivalent circuit protection behavior.

Q: Why do some substitutes have operating temperature ranges specified while others do not?

A: Operating temperature specifications are provided by manufacturers when tested and validated. Littelfuse and SCHURTER parts specify -55°C to 125°C operating range. Eaton parts do not specify operating temperature in the provided data. Both approaches indicate the parts are suitable for standard industrial applications.

Q: Is RoHS3 compliance mandatory for replacement?

A: RoHS3 compliance is required for new equipment designs and is increasingly mandated in many markets. All recommended active-status substitutes are RoHS3 compliant. The original BK/S504-5A is RoHS non-compliant due to its obsolete status.

Q: Can I use a 5 A fuse with different breaking capacity in my circuit?

A: Breaking capacity must be selected based on circuit requirements and fault current levels. All substitutes in this comparison maintain 50 A breaking capacity (except the original 35 A), which is suitable for standard low-voltage applications. Circuit design specifications should determine the appropriate breaking capacity requirement.

Q: What packaging options are available?

A: All substitute parts are available in bulk packaging. The original BK/S504-5A is listed with unspecified packaging. Bulk packaging is standard for industrial component procurement.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message