Equivalent & Substitute Parts for BK/PCH-3 Board Mount Fuse

Part Overview

The BK/PCH-3 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 component is classified as obsolete, with 859 pieces currently in stock. The fuse features fast-blow response characteristics, radial box package configuration, and through-hole mounting for PCB integration.

Due to the obsolete product status of BK/PCH-3, equivalent substitute parts with active product status are available. These substitutes maintain identical electrical and mechanical specifications while offering improved availability and compliance with current regulatory standards.

Key Parameters

Parameter	Specification
Current Rating	3 A
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	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 BK/PCH-3 is determined by strict equivalence across all electrical and mechanical parameters. The following criteria establish direct substitutability:

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):

Mounting Type: Through Hole
Fuse Type: Board Mount (Cartridge Style Excluded)
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)

Regulatory Parameters (Must Match Exactly):

Approval Agency: CSA, UL
Series: PC-Tron®

All substitute parts listed below satisfy these criteria and are manufactured by Eaton - Electronics Division.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage AC	Voltage DC	Response Time	Breaking Capacity AC	Breaking Capacity DC	Melting I²t	Package	Product Status	RoHS Status	Inventory (Pcs)
BK/PCH-3	Eaton - Electronics Division	3 A	250 V	450 V	Fast Blow	50 A	4.4 kA	0.75	Radial, Box	Obsolete	RoHS non-compliant	859
BK/PCH-3-R	Eaton - Electronics Division	3 A	250 V	450 V	Fast Blow	50 A	4.4 kA	0.75	Radial, Box	Active	ROHS3 Compliant	1690
PCH-3-R	Eaton - Electronics Division	3 A	250 V	450 V	Fast Blow	50 A	4.4 kA	0.75	Radial, Box	Active	ROHS3 Compliant	942
BK/PCB-3-R	Eaton - Electronics Division	3 A	250 V	450 V	Fast Blow	50 A	4.4 kA	0.75	Radial, Box	Active	ROHS3 Compliant	20099
BK/PCC-3-R	Eaton - Electronics Division	3 A	250 V	450 V	Fast Blow	50 A	4.4 kA	0.75	Radial, Box	Active	ROHS3 Compliant	2551
BK/PCF-3-R	Eaton - Electronics Division	3 A	250 V	450 V	Fast Blow	50 A	4.4 kA	0.75	Radial, Box	Active	ROHS3 Compliant	811
PCB-3-R	Eaton - Electronics Division	3 A	250 V	450 V	Fast Blow	50 A	4.4 kA	0.75	Radial, Box	Active	ROHS3 Compliant	878
PCC-3-R	Eaton - Electronics Division	3 A	250 V	450 V	Fast Blow	50 A	4.4 kA	0.75	Radial, Box	Active	ROHS3 Compliant	931
PCF-3-R	Eaton - Electronics Division	3 A	250 V	450 V	Fast Blow	50 A	4.4 kA	0.75	Radial, Box	Active	ROHS3 Compliant	757

Engineering Selection Recommendations

Primary Recommendation: BK/PCB-3-R

BK/PCB-3-R is the preferred substitute for BK/PCH-3. This part maintains complete electrical and mechanical equivalence while offering the highest inventory availability (20,099 pieces). The part carries active product status, ensuring long-term supply continuity. BK/PCB-3-R is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for new designs and production environments.

Secondary Recommendations:

BK/PCH-3-R and PCH-3-R are direct functional equivalents with active product status and ROHS3 compliance. Both parts are suitable for applications requiring the BK/PCH-3 specification. BK/PCH-3-R offers higher inventory (1,690 pieces) compared to PCH-3-R (942 pieces).

Alternative Options:

BK/PCC-3-R, PCB-3-R, PCC-3-R, and PCF-3-R are parametric equivalents with identical electrical and mechanical characteristics. All maintain active product status and ROHS3 compliance. Selection among these alternatives may be based on internal part numbering conventions, supplier agreements, or inventory management priorities.

Compliance Consideration:

All substitute parts are CSA and UL approved, matching the certification profile of the original BK/PCH-3. Substitutes with "-R" designation are ROHS3 compliant, addressing regulatory requirements for products manufactured after the RoHS directive implementation date.

Frequently Asked Questions (FAQ)

Q: Can BK/PCH-3 be directly replaced with any of the listed substitute parts?

A: Yes. All listed substitute parts are parametrically equivalent to BK/PCH-3 across electrical specifications (3 A, 250 V AC, 450 V DC, fast-blow response), mechanical configuration (through-hole, radial box package, identical dimensions), and regulatory approvals (CSA, UL). Direct substitution is supported without circuit modification.

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

A: Both parts are electrically and mechanically identical. The primary differences are product status (BK/PCH-3 is obsolete; BK/PCH-3-R is active) and RoHS compliance (BK/PCH-3 is non-compliant; BK/PCH-3-R is ROHS3 compliant). BK/PCH-3-R is the recommended replacement for new applications and ongoing production.

Q: Are the parts with different prefixes (BK/PCB-3-R, PCB-3-R, etc.) interchangeable?

A: Yes. All listed parts share identical electrical and mechanical specifications. Differences in part number prefixes reflect internal Eaton designation schemes but do not affect functional performance or physical compatibility. Selection may be based on supplier preference or internal part management systems.

Q: What is the significance of the "-R" suffix in substitute part numbers?

A: The "-R" suffix indicates parts with active product status and ROHS3 compliance. These parts are manufactured to current regulatory standards and are recommended for new designs and production environments requiring RoHS compliance.

Q: Can BK/PCH-3 be used in applications requiring ROHS compliance?

A: No. BK/PCH-3 is RoHS non-compliant. For applications requiring RoHS compliance, use substitute parts with active status and ROHS3 compliance designation, such as BK/PCB-3-R, BK/PCH-3-R, or PCH-3-R.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts are supplied in bulk packaging. Packaging specifications are identical across all listed alternatives. No special packaging options are indicated in the provided data.

Q: What is the melting I²t value, and why is it important for substitution?

A: The melting I²t value of 0.75 represents the thermal energy required to melt the fuse element. This parameter must match exactly for proper substitution to ensure consistent overcurrent protection characteristics and response time. All listed substitutes maintain this specification.

Q: Which substitute part offers the best availability?

A: BK/PCB-3-R offers the highest inventory level at 20,099 pieces, providing optimal supply continuity for high-volume applications or long-term production requirements.

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