Equivalent & Substitute Parts for BK/PCB-3/4-SD

Part Overview

The BK/PCB-3/4-SD is a 750 mA board mount fuse manufactured by Eaton - Electronics Division, part of the PC-Tron® series. This component is rated for 250 V AC and 450 V DC operation with fast blow response characteristics. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for direct board-level substitution.

Key Parameters

Parameter	Specification
Current Rating	750 mA
Voltage Rating - AC	250 V
Voltage Rating - DC	450 V
Response Time	Fast Blow
Mounting Type	Through Hole
Fuse Type	Board Mount (Cartridge Style Excluded)
Package / Case	Radial, Box
Breaking Capacity @ Rated Voltage	50A AC, 5.9kA DC
Melting I²t	0.016
Size / Dimension	0.350" L x 0.184" W x 0.345" H (8.89mm x 4.67mm x 8.76mm)
Approval Agency	CSA, UL
Series	PC-Tron®

Substitute Part Grouping Explanation

Substitution of the obsolete BK/PCB-3/4-SD is based on strict parametric equivalence across all electrical and mechanical characteristics. All substitute parts maintain identical current rating (750 mA), voltage ratings (250 V AC / 450 V DC), response time (fast blow), breaking capacity, melting I²t value, physical dimensions, and regulatory approvals (CSA, UL).

The substitute parts are grouped into two categories:

Direct Manufacturer Equivalent: BK/PCB-3/4-R maintains the identical part designation with "R" packaging suffix, indicating bulk packaging versus the original "-SD" designation.

Parametric Equivalents: BK/PCC-3/4-R, BK/PCF-3/4-R, BK/PCH-3/4-R, PCB-3/4-R, PCC-3/4-R, PCF-3/4-R, and PCH-3/4-R all share identical electrical specifications and physical form factors. These variants represent different internal construction or material compositions within the PC-Tron® series, all meeting the same performance criteria.

All substitute parts are active products with current manufacturing status and RoHS3 compliance, providing long-term availability assurance.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage AC	Voltage DC	Response Time	Breaking Capacity AC	Breaking Capacity DC	Melting I²t	Product Status	RoHS Status	Inventory (Pcs)
BK/PCB-3/4-SD	Eaton	750 mA	250 V	450 V	Fast Blow	50A	5.9kA	0.016	Obsolete	Non-compliant	985
BK/PCB-3/4-R	Eaton	750 mA	250 V	450 V	Fast Blow	50A	5.9kA	0.016	Active	RoHS3 Compliant	1946
BK/PCC-3/4-R	Eaton	750 mA	250 V	450 V	Fast Blow	50A	5.9kA	0.016	Active	RoHS3 Compliant	1485
BK/PCF-3/4-R	Eaton	750 mA	250 V	450 V	Fast Blow	50A	5.9kA	0.016	Active	RoHS3 Compliant	1155
BK/PCH-3/4-R	Eaton	750 mA	250 V	450 V	Fast Blow	50A	5.9kA	0.016	Active	RoHS3 Compliant	1061
PCB-3/4-R	Eaton	750 mA	250 V	450 V	Fast Blow	50A	5.9kA	0.016	Active	RoHS3 Compliant	983
PCC-3/4-R	Eaton	750 mA	250 V	450 V	Fast Blow	50A	5.9kA	0.016	Active	RoHS3 Compliant	692
PCF-3/4-R	Eaton	750 mA	250 V	450 V	Fast Blow	50A	5.9kA	0.016	Active	RoHS3 Compliant	1109
PCH-3/4-R	Eaton	750 mA	250 V	450 V	Fast Blow	50A	5.9kA	0.016	Active	RoHS3 Compliant	974

Engineering Selection Recommendations

Primary Recommendation: BK/PCB-3/4-R is the direct successor to BK/PCB-3/4-SD, maintaining identical part designation with active product status and RoHS3 compliance. This part provides the highest inventory availability (1946 units) and represents the most direct replacement path.

Secondary Recommendations: BK/PCF-3/4-R, BK/PCH-3/4-R, BK/PCC-3/4-R, PCF-3/4-R, PCH-3/4-R, PCC-3/4-R, and PCB-3/4-R are all parametrically equivalent alternatives within the PC-Tron® series. All maintain active product status with RoHS3 compliance and CSA/UL approvals.

Compliance Advantage: All substitute parts are RoHS3 compliant, whereas the original BK/PCB-3/4-SD is non-compliant. This provides regulatory advantage for new designs and long-term supply chain sustainability.

Availability Consideration: Substitute parts demonstrate consistent inventory levels ranging from 692 to 1946 units, ensuring reliable procurement for production requirements.

Frequently Asked Questions (FAQ)

Q: Can BK/PCB-3/4-R directly replace BK/PCB-3/4-SD on existing PCBs?

A: Yes. BK/PCB-3/4-R is electrically and mechanically identical to BK/PCB-3/4-SD. Both share identical current rating (750 mA), voltage ratings (250 V AC / 450 V DC), response time (fast blow), breaking capacity, melting I²t, physical dimensions (0.350" L x 0.184" W x 0.345" H), and regulatory approvals (CSA, UL). The difference is packaging designation and product status.

Q: What is the difference between BK/PCB-3/4-R and PCB-3/4-R?

A: Both parts are parametrically identical in all electrical and mechanical specifications. The "BK/" prefix indicates Eaton's internal designation variant. All electrical performance, physical form factor, and regulatory approvals are equivalent.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed (BK/PCB-3/4-R, BK/PCC-3/4-R, BK/PCF-3/4-R, BK/PCH-3/4-R, PCB-3/4-R, PCC-3/4-R, PCF-3/4-R, PCH-3/4-R) are RoHS3 compliant. The original BK/PCB-3/4-SD is non-compliant.

Q: Do all substitute parts maintain the same breaking capacity?

A: Yes. All substitute parts maintain identical breaking capacity of 50A AC and 5.9kA DC at rated voltage, matching the original BK/PCB-3/4-SD specification.

Q: Can I use any of the listed substitutes interchangeably?

A: Yes. All listed parts are parametrically equivalent across current rating, voltage ratings, response time, breaking capacity, melting I²t, physical dimensions, and regulatory approvals. Board-level substitution is direct.

Q: What is the melting I²t specification and why is it important?

A: Melting I²t of 0.016 defines the thermal energy required to melt the fuse element. This specification is identical across all substitute parts, ensuring consistent thermal protection characteristics in circuit applications.

Q: Are there any temperature rating differences between substitute parts?

A: Operating temperature specifications are not provided in the technical data for any part in this series. All parts share identical electrical and mechanical parameters for substitution purposes.

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