Equivalent & Substitute Parts for BK-PCH-3-SD

Part Overview

The BK-PCH-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 is designed for fast-blow response with a breaking capacity of 50 A AC and 4.4 kA DC. The part is currently classified as obsolete, necessitating identification of active equivalent and substitute components to maintain design continuity and ensure component availability for new production and field replacements.

Key Parameters

Parameter	Value
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
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 for the obsolete BK-PCH-3-SD is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute parts are grouped into two categories based on manufacturer and parametric alignment:

Direct Manufacturer Equivalents (Eaton - Electronics Division, PC-Tron® Series): All substitute parts maintain identical electrical specifications: 3 A current rating, 250 V AC / 450 V DC voltage ratings, fast-blow response, 50 A AC / 4.4 kA DC breaking capacity, and identical physical dimensions (0.350" L x 0.184" W x 0.345" H). These parts differ only in packaging configuration (bulk vs. box) and product status (active vs. obsolete). The key parameters determining substitution are current rating, voltage ratings, response time, breaking capacity, and physical dimensions.

Similar Manufacturer Alternative (Littelfuse Inc., 808 Series): The part 80813000000 shares the same current rating (3 A), AC voltage rating (250 V), response time (fast blow), mounting type (through hole), and physical dimensions (0.350" L x 0.183" W x 0.350" H). However, this part operates at a reduced DC voltage rating of 350 V compared to the 450 V DC specification of the main part, and features different breaking capacity (200 A AC, 10 kA DC) and melting I²t characteristics (0.2191 vs. 0.75).

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage AC (V)	Voltage DC (V)	Response Time	Breaking Capacity AC / DC	Melting I²t	Product Status	RoHS Status	Inventory (Pcs)
BK-PCH-3-SD	Eaton	3	250	450	Fast Blow	50 A / 4.4 kA	Not specified	Obsolete	Non-compliant	1074
BK/PCH-3-R	Eaton	3	250	450	Fast Blow	50 A / 4.4 kA	0.75	Active	ROHS3 Compliant	1690
BK/PCB-3-R	Eaton	3	250	450	Fast Blow	50 A / 4.4 kA	0.75	Active	ROHS3 Compliant	20099
BK/PCC-3-R	Eaton	3	250	450	Fast Blow	50 A / 4.4 kA	0.75	Active	ROHS3 Compliant	2551
BK/PCF-3-R	Eaton	3	250	450	Fast Blow	50 A / 4.4 kA	0.75	Active	ROHS3 Compliant	811
PCB-3-R	Eaton	3	250	450	Fast Blow	50 A / 4.4 kA	0.75	Active	ROHS3 Compliant	878
PCC-3-R	Eaton	3	250	450	Fast Blow	50 A / 4.4 kA	0.75	Active	ROHS3 Compliant	931
PCF-3-R	Eaton	3	250	450	Fast Blow	50 A / 4.4 kA	0.75	Active	ROHS3 Compliant	757
PCH-3-R	Eaton	3	250	450	Fast Blow	50 A / 4.4 kA	0.75	Active	ROHS3 Compliant	942
80813000000	Littelfuse	3	250	350	Fast Blow	200 A / 10 kA	0.2191	Active	ROHS3 Compliant	888

Engineering Selection Recommendations

Primary Substitutes (Eaton PC-Tron® Series):

The eight active Eaton PC-Tron® parts (BK/PCH-3-R, BK/PCB-3-R, BK/PCC-3-R, BK/PCF-3-R, PCB-3-R, PCC-3-R, PCF-3-R, PCH-3-R) are direct parametric equivalents to the obsolete BK-PCH-3-SD. All maintain identical electrical ratings (3 A, 250 V AC, 450 V DC), response characteristics (fast blow), breaking capacity (50 A AC, 4.4 kA DC), and physical dimensions. All substitute parts are ROHS3 compliant and carry CSA and UL approvals. Selection among these eight parts should be based on packaging requirements (bulk vs. box) and inventory availability. BK/PCB-3-R offers the highest inventory level (20,099 pcs), providing optimal supply chain continuity.

Secondary Alternative (Littelfuse 808 Series):

The Littelfuse part 80813000000 is a similar but not equivalent substitute. This part is suitable only for applications where the reduced DC voltage rating of 350 V (versus 450 V DC) is acceptable. The higher breaking capacity (200 A AC, 10 kA DC) and different melting I²t (0.2191) indicate different thermal and electrical characteristics. This part should be selected only when the primary Eaton equivalents are unavailable and circuit design permits the lower DC voltage specification.

Frequently Asked Questions (FAQ)

Q: Can BK/PCB-3-R directly replace the obsolete BK-PCH-3-SD?

A: Yes. BK/PCB-3-R is a direct parametric equivalent with identical current rating (3 A), voltage ratings (250 V AC / 450 V DC), response time (fast blow), breaking capacity (50 A AC / 4.4 kA DC), and physical dimensions (0.350" L x 0.184" W x 0.345" H). The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 compliant vs. non-compliant).

Q: What is the difference between the eight Eaton substitute parts?

A: All eight Eaton substitute parts (BK/PCH-3-R, BK/PCB-3-R, BK/PCC-3-R, BK/PCF-3-R, PCB-3-R, PCC-3-R, PCF-3-R, PCH-3-R) are parametrically identical. Differences exist only in packaging configuration (bulk vs. box) and inventory levels. Selection should be based on procurement packaging requirements and supply availability.

Q: Is the Littelfuse 80813000000 a suitable replacement?

A: The Littelfuse 80813000000 shares the same current rating (3 A), AC voltage rating (250 V), response time (fast blow), and physical dimensions. However, it operates at a reduced DC voltage rating of 350 V compared to the 450 V DC specification of BK-PCH-3-SD. This part is suitable only for applications where the lower DC voltage rating is acceptable. The higher breaking capacity (200 A AC vs. 50 A AC) and different melting I²t (0.2191 vs. 0.75) also indicate different thermal characteristics.

Q: Are all substitute parts approved by the same agencies?

A: The eight Eaton substitute parts carry CSA and UL approvals, matching the original BK-PCH-3-SD. The Littelfuse 80813000000 carries cURus and PSE/JET approvals, which differ from the original part's certification agencies.

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

A: The melting I²t value (0.75 for Eaton parts, 0.2191 for Littelfuse) indicates the thermal energy required to melt the fuse element. This parameter affects the fuse's response to overcurrent conditions. The Eaton substitutes maintain the same melting I²t as the original part, ensuring identical thermal response characteristics.

Q: Can I use these parts interchangeably in existing designs?

A: The eight Eaton substitute parts are fully interchangeable with BK-PCH-3-SD based on electrical and mechanical parameters. The Littelfuse part is interchangeable only if the circuit design permits operation at 350 V DC instead of 450 V DC.

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