Equivalent & Substitute Parts for BK-S505SC-6.3-R Ceramic Fuse

Part Overview

The BK-S505SC-6.3-R is a 6.3 A, 250 V AC/DC ceramic cartridge fuse manufactured by Eaton - Electronics Division. This through-hole fuse operates with slow-blow response characteristics in a 5mm x 20mm axial package format. The part maintains active product status with 1119 units in current inventory. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when supply chain optimization is required.

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)

Substitute Part Grouping Explanation

Substitute parts for the BK-S505SC-6.3-R ceramic fuse are qualified based on strict electrical and mechanical parameter alignment. All substitute parts share identical specifications across the following critical parameters:

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
Physical Dimensions: 0.205" Dia x 0.787" L (5.20mm x 20.00mm)

These parameters define the functional and physical interchangeability of the substitute parts. Variations in secondary characteristics such as melting I²t, DC cold resistance, and operating temperature ranges do not affect substitution eligibility within this product category.

Parameter Comparison

Parameter	BK-S505SC-6.3-R (Eaton)	021506.3MXESPP (Littelfuse)	0659P6300-13 (Bel Fuse)	TUC UDA-P 6.3A 250V (PF) (Conquer)
Current Rating (Amps)	6.3 A	6.3 A	6.3 A	6.3 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	5mm x 20mm (Axial)	5mm x 20mm (Axial)	5mm x 20mm (Axial)	5mm x 20mm (Axial)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Breaking Capacity @ Rated Voltage	1.5 kA	1.5 kA	1.5 kA	1.5 kA
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)	0.205" Dia x 0.787" L (5.20mm x 20.00mm)	0.205" Dia x 0.787" L (5.20mm x 20.00mm)	0.205" Dia x 0.787" L (5.20mm x 20.00mm)
Melting I²t	111	128.75	142.9	130.1
DC Cold Resistance (Ohms)	0.0102	0.0108	0.009	0.0099
Product Status	Active	Active	Active	Active
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All four parts maintain active product status and comply with RoHS requirements. Selection among the BK-S505SC-6.3-R and its substitute parts should be based on the following factors:

Certification Alignment: The BK-S505SC-6.3-R carries approvals from BSI, CCC/CQC, CSA, cURus, IMQ, KC, PSE/JET, SEMKO, and VDE. The Littelfuse 021506.3MXESPP holds CE, CQC, CSA, KC, PSE, UR, and VDE certifications. The Bel Fuse 0659P6300-13 is certified by CQC, cURus, PSE, and VDE. The Conquer TUC UDA-P 6.3A 250V (PF) carries CCC, cURus, KC, PSE, and TUV approvals. Component selection should prioritize parts whose certification portfolio matches the regulatory requirements of the target application.

Inventory Availability: Current stock levels are 1119 units for BK-S505SC-6.3-R, 2031 units for 021506.3MXESPP, 3078 units for 0659P6300-13, and 1927 units for TUC UDA-P 6.3A 250V (PF).

Operating Temperature Range: The BK-S505SC-6.3-R does not specify an operating temperature range. The Littelfuse, Bel Fuse, and Conquer parts all operate across -55°C to 125°C.

Frequently Asked Questions (FAQ)

Q: Can the 021506.3MXESPP (Littelfuse) be used as a direct replacement for the BK-S505SC-6.3-R (Eaton)?

A: Yes. Both parts share identical electrical ratings (6.3 A, 250 V AC), fuse type (ceramic cartridge), response time (slow blow), and physical dimensions (5mm x 20mm axial). Both are through-hole mounted components with 1.5 kA breaking capacity.

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

A: The melting I²t values (111 for Eaton, 128.75 for Littelfuse, 142.9 for Bel Fuse, and 130.1 for Conquer) represent thermal energy thresholds. These variations fall within acceptable ranges for 6.3 A slow-blow ceramic fuses and do not prevent substitution. The parts remain functionally equivalent for circuit protection applications.

Q: Are all substitute parts RoHS compliant?

A: Yes. The BK-S505SC-6.3-R is RoHS Compliant. The Littelfuse 021506.3MXESPP, Bel Fuse 0659P6300-13, and Conquer TUC UDA-P 6.3A 250V (PF) are all ROHS3 Compliant.

Q: Do the substitute parts fit the same PCB footprint as the BK-S505SC-6.3-R?

A: Yes. All substitute parts maintain identical physical dimensions of 0.205" diameter by 0.787" length (5.20mm x 20.00mm) and through-hole mounting configuration, ensuring compatibility with existing PCB designs.

Q: Which substitute part should be selected if specific regulatory certifications are required?

A: Certification requirements vary by application and region. The BK-S505SC-6.3-R carries the broadest certification portfolio including BSI, CCC/CQC, CSA, cURus, IMQ, KC, PSE/JET, SEMKO, and VDE. The Littelfuse 021506.3MXESPP includes CE certification. The Bel Fuse 0659P6300-13 and Conquer TUC UDA-P 6.3A 250V (PF) do not include CE certification. Selection should align with the specific certifications required by the target application.

Q: What is the difference in DC cold resistance among the parts?

A: DC cold resistance values are 0.0102 Ohms (Eaton), 0.0108 Ohms (Littelfuse), 0.009 Ohms (Bel Fuse), and 0.0099 Ohms (Conquer). These minor variations do not affect substitution eligibility and remain within acceptable tolerances for ceramic cartridge fuses in this current rating.

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