BK/PCB-2-1/2 Equivalent & Substitute Parts Reference

Part Overview

The BK/PCB-2-1/2 is a 2.5 A board mount fuse rated for 250 V AC and 450 V DC operation, manufactured by Eaton - Electronics Division under the PC-Tron® series. This component is classified as obsolete, with 948 pieces currently in stock. The fuse features fast blow response characteristics and is designed for through-hole radial mounting in a box package configuration.

Due to the obsolete product status of BK/PCB-2-1/2, identification of equivalent and substitute parts is necessary for ongoing design support, maintenance, and production continuity. Active equivalent models from Eaton and alternative manufacturers provide functional replacements with identical electrical specifications and mechanical compatibility.

Key Parameters

Parameter	Value
Current Rating	2.5 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
Size / Dimension	0.350" L x 0.184" W x 0.345" H (8.89mm x 4.67mm x 8.76mm)
Breaking Capacity @ Rated Voltage	50A AC, 5.9kA DC
Melting I²t	0.3
Approval Agency	CSA, UL
Series	PC-Tron®

Substitute Part Grouping Explanation

Substitute parts for BK/PCB-2-1/2 are classified into two categories based on substitution criteria:

Direct Manufacturer Equivalents (Eaton - Electronics Division): These parts maintain identical electrical parameters, mechanical dimensions, and approval certifications. Substitution is based on matching current rating (2.5 A), voltage ratings (250 V AC / 450 V DC), response time (Fast Blow), mounting configuration (Through Hole), and package type (Radial, Box). All direct equivalents are active products with RoHS3 compliance, addressing the obsolete status of the original part.

Parametric Equivalents (Eaton - Electronics Division): These parts share all critical electrical and mechanical specifications with the main part. Substitution criteria include identical current rating, voltage ratings, response time, mounting type, package configuration, and physical dimensions. These active alternatives provide functional interchangeability for circuit protection applications.

Cross-Manufacturer Alternative (Littelfuse Inc.): The Littelfuse TE5® 808 series parts (80812500075, 80812500440) provide functional equivalence based on matching electrical parameters: 2.5 A current rating, 250 V AC / 450 V DC voltage ratings, Fast Blow response, Through Hole mounting, and Radial Box package. These parts feature enhanced breaking capacity (100A AC, 10kA DC versus 50A AC, 5.9kA DC) and improved operating temperature range (-40°C to 125°C), with cULus approval certification.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage AC (V)	Voltage DC (V)	Response Time	Breaking Capacity AC	Breaking Capacity DC	Melting I²t	Product Status	RoHS Status
BK/PCB-2-1/2	Eaton	2.5	250	450	Fast Blow	50A	5.9kA	0.3	Obsolete	Non-compliant
BK/PCB-2-1/2-R	Eaton	2.5	250	450	Fast Blow	50A	5.9kA	0.3	Active	ROHS3 Compliant
BK/PCC-2-1/2-R	Eaton	2.5	250	450	Fast Blow	50A	5.9kA	0.3	Active	ROHS3 Compliant
BK/PCH-2-1/2-R	Eaton	2.5	250	450	Fast Blow	50A	5.9kA	0.3	Active	ROHS3 Compliant
PCB-2-1/2-R	Eaton	2.5	250	450	Fast Blow	50A	5.9kA	0.3	Active	ROHS3 Compliant
PCC-2-1/2-R	Eaton	2.5	250	450	Fast Blow	50A	5.9kA	0.3	Active	ROHS3 Compliant
PCH-2-1/2-R	Eaton	2.5	250	450	Fast Blow	50A	5.9kA	0.3	Active	ROHS3 Compliant
80812500075	Littelfuse	2.5	250	450	Fast Blow	100A	10kA	0.0898	Active	ROHS3 Compliant
80812500440	Littelfuse	2.5	250	450	Fast Blow	100A	10kA	0.0898	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: BK/PCB-2-1/2-R

The BK/PCB-2-1/2-R is the direct active equivalent manufactured by Eaton - Electronics Division. This part maintains identical electrical specifications, mechanical dimensions, and approval certifications (CSA, UL) as the obsolete BK/PCB-2-1/2. The part is active with 10,134 units in stock and carries ROHS3 compliance certification. Selection of this part ensures seamless integration into existing designs without circuit modification.

Secondary Recommendations: BK/PCC-2-1/2-R, BK/PCH-2-1/2-R, PCB-2-1/2-R, PCC-2-1/2-R, PCH-2-1/2-R

These Eaton PC-Tron® series alternatives provide parametric equivalence with identical electrical and mechanical specifications. All are active products with ROHS3 compliance. These parts are suitable for direct substitution where design flexibility permits component variation within the same manufacturer family.

Alternative Manufacturer Option: 80812500075 or 80812500440 (Littelfuse TE5® 808)

The Littelfuse parts provide functional equivalence with enhanced performance characteristics. Both parts maintain the required 2.5 A current rating, 250 V AC / 450 V DC voltage ratings, and Fast Blow response. These alternatives feature superior breaking capacity (100A AC, 10kA DC) and extended operating temperature range (-40°C to 125°C). Littelfuse parts carry cULus approval and ROHS3 compliance. Selection of Littelfuse alternatives is appropriate when enhanced performance margins or extended temperature operation are required by circuit design specifications.

Frequently Asked Questions (FAQ)

Q: Can BK/PCB-2-1/2-R be used as a direct replacement for BK/PCB-2-1/2?

A: Yes. BK/PCB-2-1/2-R is the active direct equivalent. Both parts share identical electrical ratings (2.5 A, 250 V AC, 450 V DC), response time (Fast Blow), mounting configuration (Through Hole), and physical dimensions (0.350" L x 0.184" W x 0.345" H). The primary difference is product status: BK/PCB-2-1/2 is obsolete while BK/PCB-2-1/2-R is active with ROHS3 compliance.

Q: What is the difference between the various Eaton PC-Tron® part numbers (BK/PCB-2-1/2-R, BK/PCC-2-1/2-R, BK/PCH-2-1/2-R, PCB-2-1/2-R, PCC-2-1/2-R, PCH-2-1/2-R)?

A: All six Eaton parts are parametric equivalents with identical electrical specifications and mechanical dimensions. The differences in part number designations reflect internal Eaton product line variations. All are active products with ROHS3 compliance and CSA/UL approval. Selection among these parts may be based on availability or internal design documentation requirements.

Q: Are Littelfuse 80812500075 and 80812500440 suitable substitutes?

A: Yes, with performance enhancement considerations. Both Littelfuse parts maintain the required 2.5 A current rating, 250 V AC / 450 V DC voltage ratings, and Fast Blow response. Physical dimensions are equivalent (0.350" L x 0.183" W x 0.350" H). These parts feature enhanced breaking capacity (100A AC, 10kA DC versus 50A AC, 5.9kA DC) and extended operating temperature range (-40°C to 125°C). Littelfuse parts carry cULus approval and ROHS3 compliance. Use Littelfuse alternatives when circuit design specifications require superior performance margins.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: current rating (2.5 A), voltage ratings (250 V AC and 450 V DC), response time (Fast Blow), mounting type (Through Hole), fuse type (Board Mount, Cartridge Style Excluded), and package configuration (Radial, Box). Physical dimensions must be equivalent to ensure PCB footprint compatibility. All substitute parts listed meet these criteria.

Q: Does packaging type affect substitution?

A: Packaging type (Bulk versus Box) does not affect electrical or mechanical compatibility. All listed substitute parts are available in Bulk packaging. Packaging designation refers to distribution format and does not impact circuit performance or physical mounting characteristics.

Q: Are all substitute parts RoHS compliant?

A: The obsolete BK/PCB-2-1/2 is RoHS non-compliant. All active substitute parts (Eaton and Littelfuse) are ROHS3 compliant, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.

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