Equivalent & Substitute Parts for BK/PCF-2-1/2

Part Overview

The BK/PCF-2-1/2 is a 2.5 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 industrial and commercial applications. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain identical electrical and mechanical specifications for direct replacement in existing designs.

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
Breaking Capacity @ Rated Voltage	50A AC, 5.9kA DC
Melting I²t	0.3
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

Substitute Part Grouping Explanation

Substitution of the BK/PCF-2-1/2 is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

Current Rating: 2.5 A (exact match required)
Voltage Rating - AC: 250 V (exact match required)
Voltage Rating - DC: 450 V (exact match required)
Response Time: Fast Blow (exact match required)

Mechanical Parameters:

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

Regulatory Parameters:

Approval Agency: CSA, UL (minimum requirement)

Substitute parts are grouped into two categories: Eaton PC-Tron® series equivalents (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) and cross-manufacturer alternatives from Littelfuse Inc. (80812500075, 80812500440). All substitute parts maintain identical electrical and mechanical specifications as the original component.

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
BK/PCF-2-1/2	Eaton	2.5 A	250 V	450 V	Fast Blow	50A	5.9kA	0.3	Obsolete	RoHS non-compliant
BK/PCB-2-1/2-R	Eaton	2.5 A	250 V	450 V	Fast Blow	50A	5.9kA	0.3	Active	ROHS3 Compliant
BK/PCC-2-1/2-R	Eaton	2.5 A	250 V	450 V	Fast Blow	50A	5.9kA	0.3	Active	ROHS3 Compliant
BK/PCH-2-1/2-R	Eaton	2.5 A	250 V	450 V	Fast Blow	50A	5.9kA	0.3	Active	ROHS3 Compliant
PCB-2-1/2-R	Eaton	2.5 A	250 V	450 V	Fast Blow	50A	5.9kA	0.3	Active	ROHS3 Compliant
PCC-2-1/2-R	Eaton	2.5 A	250 V	450 V	Fast Blow	50A	5.9kA	0.3	Active	ROHS3 Compliant
PCH-2-1/2-R	Eaton	2.5 A	250 V	450 V	Fast Blow	50A	5.9kA	0.3	Active	ROHS3 Compliant
80812500075	Littelfuse	2.5 A	250 V	450 V	Fast Blow	100A	10kA	0.0898	Active	ROHS3 Compliant
80812500440	Littelfuse	2.5 A	250 V	450 V	Fast Blow	100A	10kA	0.0898	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Eaton PC-Tron® Series):

The Eaton PC-Tron® series parts 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, and PCH-2-1/2-R are direct parametric equivalents to the obsolete BK/PCF-2-1/2. All six parts maintain identical electrical specifications (2.5 A, 250 V AC, 450 V DC, fast-blow response) and mechanical form factor (through-hole radial, 0.350" L x 0.184" W x 0.345" H). These parts are currently in active production status and comply with ROHS3 requirements, addressing the RoHS non-compliance of the original component. All Eaton equivalents carry CSA and UL approvals consistent with the original part.

Secondary Substitutes (Littelfuse TE5® 808 Series):

The Littelfuse parts 80812500075 and 80812500440 are direct manufacturer alternatives that match the electrical specifications (2.5 A, 250 V AC, 450 V DC, fast-blow response) and mechanical mounting configuration. These parts feature enhanced breaking capacity (100A AC, 10kA DC versus 50A AC, 5.9kA DC) and lower melting I²t values (0.0898 versus 0.3), indicating faster response characteristics. Both Littelfuse parts are ROHS3 compliant and carry cULus approval. The operating temperature range (-40°C ~ 125°C) and MSL rating (1 - Unlimited) provide additional environmental performance data not specified for the original part.

Selection Basis:

Selection between Eaton and Littelfuse alternatives depends on design requirements for breaking capacity and response speed. Eaton equivalents provide direct form-fit-function replacement with identical electrical characteristics. Littelfuse alternatives offer enhanced fault-clearing capability suitable for applications requiring higher breaking capacity margins.

Frequently Asked Questions (FAQ)

Q: Can BK/PCB-2-1/2-R, BK/PCC-2-1/2-R, and BK/PCH-2-1/2-R be used interchangeably with BK/PCF-2-1/2?

A: Yes. All three Eaton parts are parametric equivalents with identical current rating (2.5 A), voltage ratings (250 V AC, 450 V DC), response time (fast-blow), and physical dimensions (0.350" L x 0.184" W x 0.345" H). They are direct replacements for through-hole board mount applications.

Q: What is the difference between the Eaton PC-Tron® variants (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 share identical electrical and mechanical specifications. The part number variations reflect different packaging configurations (Bulk) and internal product line designations within the PC-Tron® series. Selection among these variants is determined by inventory availability and packaging requirements rather than functional differences.

Q: How do Littelfuse 80812500075 and 80812500440 differ from the Eaton equivalents?

A: Both Littelfuse parts maintain the same current rating (2.5 A) and voltage ratings (250 V AC, 450 V DC). However, they feature higher breaking capacity (100A AC, 10kA DC versus 50A AC, 5.9kA DC) and lower melting I²t (0.0898 versus 0.3), resulting in faster fault clearing. The Littelfuse TE5® 808 series also specifies operating temperature range (-40°C ~ 125°C) and DC cold resistance (0.069 Ohms).

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts (Eaton and Littelfuse) are ROHS3 compliant. The original BK/PCF-2-1/2 is RoHS non-compliant. Substitution with any active equivalent addresses RoHS compliance requirements for new designs or component refresh cycles.

Q: What approval agencies certify these substitute parts?

A: Eaton PC-Tron® equivalents carry CSA and UL approvals. Littelfuse TE5® 808 series parts carry cULus approval. All certifications meet or exceed the original part's regulatory requirements.

Q: Can the Littelfuse parts be used in applications designed for the original BK/PCF-2-1/2?

A: Yes. The Littelfuse parts are electrically and mechanically compatible. The enhanced breaking capacity and faster response characteristics of the Littelfuse alternatives provide equal or superior performance in circuit protection applications. Physical dimensions are equivalent (0.350" L x 0.183" W x 0.350" H for Littelfuse versus 0.350" L x 0.184" W x 0.345" H for the original), ensuring through-hole board mount compatibility.

Q: What is the inventory status of substitute parts?

A: Eaton PC-Tron® equivalents are in active production with available inventory: BK/PCB-2-1/2-R (10,134 pcs), BK/PCC-2-1/2-R (4,389 pcs), BK/PCH-2-1/2-R (953 pcs), PCB-2-1/2-R (1,160 pcs), PCC-2-1/2-R (836 pcs), PCH-2-1/2-R (1,149 pcs). Littelfuse alternatives are also in active production: 80812500075 (893 pcs), 80812500440 (743 pcs).

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