BK/S505SC-6.3-R Equivalent & Substitute Parts

Part Overview

The BK/S505SC-6.3-R is a 6.3 A, 250 V AC/DC ceramic cartridge fuse with slow-blow response characteristics, designed for through-hole mounting in 5mm x 20mm (axial) form factor applications. Manufactured by Eaton - Electronics Division, this component is classified as Active product status with full RoHS3 compliance and international safety certifications. Substitute parts are identified based on matching electrical ratings, mechanical dimensions, response time characteristics, and approval agency certifications to ensure direct functional equivalence in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	6.3 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Ceramic
Response Time	Slow Blow
Package / Case	5mm x 20mm (Axial)
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	1.5 kA
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the BK/S505SC-6.3-R are qualified based on the following criteria:

Electrical Parameters (Mandatory Match):

Current Rating: 6.3 A
Voltage Rating (AC): 250 V
Response Time: Slow Blow
Breaking Capacity @ Rated Voltage: 1.5 kA

Mechanical Parameters (Mandatory Match):

Package / Case: 5mm x 20mm (Axial)
Mounting Type: Through Hole
Size / Dimension: 0.205" Dia x 0.787" L (5.20mm x 20.00mm)

Compliance Parameters (Mandatory Match):

RoHS Status: ROHS3 Compliant
Fuse Type: Cartridge, Ceramic

All identified substitute parts meet these criteria and are classified as parametric equivalents. Variations in melting I²t values and DC cold resistance remain within acceptable engineering tolerances for this product category and do not affect functional substitution.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package / Case	Breaking Capacity (kA)	Melting I²t	DC Cold Resistance (Ohms)	RoHS Status	Product Status
BK/S505SC-6.3-R	Eaton - Electronics Division	6.3	250	Slow Blow	5mm x 20mm (Axial)	1.5	152	0.01	ROHS3 Compliant	Active
BK-S505SC-6.3-R	Eaton - Electronics Division	6.3	250	Slow Blow	5mm x 20mm (Axial)	1.5	111	0.0102	RoHS Compliant	Active
021506.3MXESPP	Littelfuse Inc.	6.3	250	Slow Blow	5mm x 20mm (Axial)	1.5	128.75	0.0108	ROHS3 Compliant	Active
0659P6300-13	Bel Fuse Inc.	6.3	250	Slow Blow	5mm x 20mm (Axial)	1.5	142.9	0.009	ROHS3 Compliant	Active
TUC UDA-P 6.3A 250V (PF)	Conquer	6.3	250	Slow Blow	5mm x 20mm (Axial)	1.5	130.1	0.0099	ROHS3 Compliant	Active

Engineering Selection Recommendations

All identified substitute parts are Active product status components with full RoHS3 compliance certification. Selection among these equivalents is based on the following factors:

Certification Coverage:

BK/S505SC-6.3-R and BK-S505SC-6.3-R (Eaton): BSI, CCC/CQC, CSA, cURus, IMQ, KC, PSE/JET, SEMKO, VDE
021506.3MXESPP (Littelfuse): CE, CQC, CSA, KC, PSE, UR, VDE
0659P6300-13 (Bel Fuse): CQC, cURus, PSE, VDE
TUC UDA-P 6.3A 250V (PF) (Conquer): CCC, cURus, KC, PSE, TUV

Inventory Availability:

0659P6300-13: 3078 Pcs
021506.3MXESPP: 2031 Pcs
TUC UDA-P 6.3A 250V (PF): 1927 Pcs
BK-S505SC-6.3-R: 1119 Pcs
BK/S505SC-6.3-R: 882 Pcs

Operating Temperature Range:

021506.3MXESPP, 0659P6300-13, TUC UDA-P 6.3A 250V (PF): -55°C ~ 125°C
BK/S505SC-6.3-R, BK-S505SC-6.3-R: Not specified

Selection should prioritize parts meeting the specific certification requirements of the target application and geographic market.

Frequently Asked Questions (FAQ)

Q: Can BK-S505SC-6.3-R be used as a direct replacement for BK/S505SC-6.3-R?

A: Yes. Both parts share identical electrical ratings (6.3 A, 250 V AC), response time (Slow Blow), mechanical dimensions (5mm x 20mm axial), and RoHS compliance status. The primary difference is melting I²t value (111 vs. 152), which remains within acceptable tolerance for this product category.

Q: What is the significance of melting I²t variation among substitute parts?

A: Melting I²t represents the thermal energy required to melt the fuse element. Variations among the listed substitutes (111 to 152) reflect different ceramic formulations and element designs while maintaining the same current rating and response time classification. All values are within the engineering tolerance for 6.3 A slow-blow ceramic cartridge fuses.

Q: Are all substitute parts suitable for international applications?

A: Certification coverage varies by manufacturer. Applications requiring specific regional certifications (e.g., PSE for Japan, CCC for China, CE for Europe) should select parts with matching approval agencies. Refer to the certification table in the Parameter Comparison section.

Q: Does operating temperature range affect substitution eligibility?

A: Operating temperature range is specified for Littelfuse, Bel Fuse, and Conquer parts (-55°C ~ 125°C) but not provided for Eaton parts. If the application requires operation within this temperature range, Littelfuse 021506.3MXESPP, Bel Fuse 0659P6300-13, or Conquer TUC UDA-P 6.3A 250V (PF) are appropriate selections.

Q: Can these ceramic cartridge fuses be used in AC and DC circuits?

A: Yes. All listed parts are rated for both AC and DC operation at 250 V, as indicated in their detailed descriptions (6.3 A 250 V AC DC Fuse Cartridge).

Q: What is the difference between ROHS3 Compliant and RoHS Compliant designations?

A: ROHS3 Compliant indicates compliance with the latest RoHS 3 directive (2011/65/EU as amended). RoHS Compliant indicates compliance with earlier RoHS standards. Both designations confirm lead-free and restricted substance compliance; ROHS3 represents the current regulatory standard.

Q: Are moisture sensitivity considerations relevant for these ceramic fuse cartridges?

A: No. All listed parts are classified as Not Applicable or MSL 1 (Unlimited) for moisture sensitivity level, indicating that standard storage and handling practices are sufficient without specialized moisture control measures.

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