BK/PCB-3-SD Equivalent & Substitute Parts

Part Overview

The BK/PCB-3-SD is a 3 A, 250 V AC / 450 V DC board mount fuse manufactured by Eaton - Electronics Division as part of the PC-Tron® series. This through-hole radial fuse features fast-blow response characteristics and is designed for circuit protection in electronic applications requiring dual voltage ratings.

The BK/PCB-3-SD carries an obsolete product status. Identification of equivalent and substitute parts is necessary to ensure continued availability for replacement, repair, and new design implementations where this fuse specification is required.

Key Parameters

Parameter	Value
Current Rating	3 A
Voltage Rating - AC	250 V
Voltage Rating - DC	450 V
Response Time	Fast Blow
Fuse Type	Board Mount (Cartridge Style Excluded)
Mounting Type	Through Hole
Package / Case	Radial, Box
Breaking Capacity @ Rated Voltage	50 A AC, 4.4 kA DC
Melting I²t	0.75
Size / Dimension	0.350" L x 0.184" W x 0.345" H (8.89 mm x 4.67 mm x 8.76 mm)
Approval Agency	CSA, UL
Series	PC-Tron®

Substitute Part Grouping Explanation

Substitution of the BK/PCB-3-SD is determined by strict equivalence across all electrical and mechanical parameters. The following criteria establish valid substitutes:

Electrical Parameters (Must Match Exactly):

Current Rating: 3 A
Voltage Rating - AC: 250 V
Voltage Rating - DC: 450 V
Response Time: Fast Blow
Breaking Capacity @ Rated Voltage: 50 A AC, 4.4 kA DC
Melting I²t: 0.75

Mechanical Parameters (Must Match Exactly):

Fuse Type: Board Mount (Cartridge Style Excluded)
Mounting Type: Through Hole
Package / Case: Radial, Box
Size / Dimension: 0.350" L x 0.184" W x 0.345" H (8.89 mm x 4.67 mm x 8.76 mm)

Certification Requirements:

Approval Agency: CSA, UL

All substitute parts listed below maintain identical electrical and mechanical specifications to the BK/PCB-3-SD, ensuring direct functional equivalence in circuit protection applications.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (A)	Voltage AC (V)	Voltage DC (V)	Response Time	Breaking Capacity AC / DC	Melting I²t	Package	Size (mm)	Product Status	RoHS Status
BK/PCB-3-SD	Eaton - Electronics Division	PC-Tron®	3	250	450	Fast Blow	50 A / 4.4 kA	0.75	Radial, Box	8.89 x 4.67 x 8.76	Obsolete	RoHS Non-Compliant
BK/PCB-3-R	Eaton - Electronics Division	PC-Tron®	3	250	450	Fast Blow	50 A / 4.4 kA	0.75	Radial, Box	8.89 x 4.67 x 8.76	Active	ROHS3 Compliant
BK/PCC-3-R	Eaton - Electronics Division	PC-Tron®	3	250	450	Fast Blow	50 A / 4.4 kA	0.75	Radial, Box	8.89 x 4.67 x 8.76	Active	ROHS3 Compliant
BK/PCF-3-R	Eaton - Electronics Division	PC-Tron®	3	250	450	Fast Blow	50 A / 4.4 kA	0.75	Radial, Box	8.89 x 4.67 x 8.76	Active	ROHS3 Compliant
BK/PCH-3-R	Eaton - Electronics Division	PC-Tron®	3	250	450	Fast Blow	50 A / 4.4 kA	0.75	Radial, Box	8.89 x 4.67 x 8.76	Active	ROHS3 Compliant
PCB-3-R	Eaton - Electronics Division	PC-Tron®	3	250	450	Fast Blow	50 A / 4.4 kA	0.75	Radial, Box	8.89 x 4.67 x 8.76	Active	ROHS3 Compliant
PCC-3-R	Eaton - Electronics Division	PC-Tron®	3	250	450	Fast Blow	50 A / 4.4 kA	0.75	Radial, Box	8.89 x 4.67 x 8.76	Active	ROHS3 Compliant
PCF-3-R	Eaton - Electronics Division	PC-Tron®	3	250	450	Fast Blow	50 A / 4.4 kA	0.75	Radial, Box	8.89 x 4.67 x 8.76	Active	ROHS3 Compliant
PCH-3-R	Eaton - Electronics Division	PC-Tron®	3	250	450	Fast Blow	50 A / 4.4 kA	0.75	Radial, Box	8.89 x 4.67 x 8.76	Active	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed maintain complete electrical and mechanical equivalence to the BK/PCB-3-SD. Selection among active alternatives should be based on the following factors:

Product Status Consideration: The BK/PCB-3-SD is obsolete. All substitute parts carry active product status, ensuring long-term availability and continued manufacturing support. Direct substitution to any active equivalent is appropriate for new designs and ongoing production requirements.

Compliance Status: The BK/PCB-3-SD is RoHS non-compliant. All substitute parts are ROHS3 compliant, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.

Certification Alignment: All substitute parts maintain CSA and UL approval certifications identical to the original part, ensuring compliance with safety and performance standards.

Inventory Availability: BK/PCB-3-R offers the highest inventory availability (20,099 units), followed by BK/PCC-3-R (2,551 units), BK/PCH-3-R (1,690 units), PCB-3-R (878 units), PCC-3-R (931 units), PCF-3-R (757 units), and BK/PCF-3-R (811 units). Selection based on supply chain requirements and lead time considerations is appropriate.

Frequently Asked Questions (FAQ)

Q: Can BK/PCB-3-R be used as a direct replacement for BK/PCB-3-SD?

A: Yes. BK/PCB-3-R is a direct substitute. Both parts share identical electrical ratings (3 A, 250 V AC, 450 V DC), response characteristics (fast blow), mechanical dimensions (0.350" L x 0.184" W x 0.345" H), and certifications (CSA, UL). The primary difference is product status: BK/PCB-3-SD is obsolete while BK/PCB-3-R is active.

Q: What is the difference between BK/PCB-3-R, BK/PCC-3-R, BK/PCF-3-R, and BK/PCH-3-R?

A: These parts are parametric equivalents with identical electrical and mechanical specifications. The letter designations (PCB, PCC, PCF, PCH) represent different product lines within the PC-Tron® series. All four parts are functionally interchangeable for the specified 3 A, 250 V AC / 450 V DC application.

Q: Are the non-prefixed versions (PCB-3-R, PCC-3-R, PCF-3-R, PCH-3-R) equivalent to the BK-prefixed versions?

A: Yes. Parts with and without the BK prefix are parametric equivalents. All maintain identical electrical ratings, response time, breaking capacity, melting I²t, package configuration, and physical dimensions. The BK prefix designation does not affect functional compatibility.

Q: Does the RoHS compliance difference between BK/PCB-3-SD and substitute parts affect circuit performance?

A: No. RoHS compliance status reflects manufacturing and material composition standards, not electrical or mechanical performance. All substitute parts deliver identical circuit protection characteristics and performance in the specified application.

Q: Can these fuses be used interchangeably in existing PCB assemblies designed for BK/PCB-3-SD?

A: Yes. All substitute parts share identical through-hole radial package configuration and physical dimensions (8.89 mm x 4.67 mm x 8.76 mm). Direct board-level substitution is supported without PCB layout modifications.

Q: What is the significance of the 0.75 melting I²t value?

A: The melting I²t of 0.75 defines the thermal energy required to melt the fuse element. This parameter is identical across all listed parts, ensuring consistent thermal response and protection characteristics in circuit applications.

Q: Are all substitute parts certified by CSA and UL?

A: Yes. All substitute parts carry CSA and UL approval certifications identical to the original BK/PCB-3-SD, meeting required safety and performance standards for board mount fuse applications.

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