BK/HTB-46I Cartridge Fuse Holder Equivalent & Substitute Parts

Part Overview

The BK/HTB-46I is a cartridge fuse holder manufactured by Eaton - Electronics Division, rated for 20 A at 250V with panel mount configuration. This single-circuit holder accommodates 0.25" diameter by 1.26" length cartridge fuses (3AG, 1/4" x 1-1/4" SFE-20 standard). The product maintains Active status and is RoHS Compliant, making it suitable for modern electronic equipment requiring fuse protection in industrial and commercial applications.

Equivalent and substitute parts become necessary when the primary part number experiences supply constraints, extended lead times, or when design revisions require alternative termination styles or manufacturer sourcing options while maintaining identical electrical and mechanical performance.

Substiute Parts

BK/HTB-46I

Eaton - Electronics DivisionIn Stock: 665BK/HTB-46I Datasheet

Current PartRFQ

BK/HTB-46I-R

Eaton - Electronics DivisionIn Stock: 2394BK/HTB-46I-R Datasheet

DirectRFQ

BK1-HTJ-606I

Eaton - Electronics DivisionIn Stock: 1749BK1-HTJ-606I Datasheet

SimilarRFQ

03420858H

Littelfuse Inc.In Stock: 103603420858H Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the BK/HTB-46I is based on strict electrical and mechanical parameter matching. Direct substitutes must maintain identical specifications across the following critical parameters:

Electrical Parameters:

• Current Rating: 20 A (exact match required)
• Voltage Rating: 250V (exact match required)
• Number of Circuits: 1 (exact match required)

Mechanical Parameters:

• Fuse Size: 0.25" Dia x 1.26" L (6.35mm x 32mm) (exact match required)
• Fuse Type: Cartridge (exact match required)
• Mounting Type: Panel Mount (exact match required)
• Compatible Fuse Standard: 3AG, 1/4" x 1-1/4" (SFE-20) (exact match required)

Termination Compatibility:

• Termination Style: Quick Connect - 0.250" (6.3mm) (exact match required for direct substitution)

Parts meeting all these criteria are classified as direct substitutes. Parts with variations in current rating, termination style, or mechanical dimensions are classified as similar alternatives and require circuit design verification before implementation.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical and Mechanical Performance):

BK/HTB-46I-R (Eaton - Electronics Division) is a direct substitute for BK/HTB-46I. Both parts maintain identical current rating (20 A), voltage rating (250V), fuse size (0.25" Dia x 1.26" L), termination style (Quick Connect - 0.250"), and compatible fuse standard (3AG, 1/4" x 1-1/4" SFE-20). The BK/HTB-46I-R carries ROHS3 Compliant certification compared to RoHS Compliant on the original part, representing an updated compliance designation. Both parts are Active status products with unlimited moisture sensitivity rating.

03420858H (Littelfuse Inc.) is a direct substitute for BK/HTB-46I. This part maintains identical electrical specifications (20 A, 250V), mechanical dimensions (0.25" Dia x 1.26" L), fuse type (Cartridge), and termination style (Quick Connect - 0.250"). The part is manufactured by Littelfuse Inc. rather than Eaton, providing alternative sourcing. The 03420858H carries ROHS3 Compliant certification and REACH Unaffected status. Contact material is specified as Brass with Nickel finish, whereas the original part does not specify contact material details.

Similar Alternative (Current Rating Variation):

BK1-HTJ-606I (Eaton - Electronics Division) is a similar alternative with a reduced current rating of 10 A compared to the 20 A rating of BK/HTB-46I. This part shares identical voltage rating (250V), fuse type (Cartridge), number of circuits (1), and mounting type (Panel Mount). However, the fuse size specification differs (0.250" Dia without length specification versus 0.25" Dia x 1.26" L), and termination style is Solder Lug rather than Quick Connect. The BK1-HTJ-606I is suitable only for applications requiring 10 A protection and requiring solder lug termination connections.

Frequently Asked Questions (FAQ)

Q: Can BK/HTB-46I-R be used as a direct replacement for BK/HTB-46I in existing designs?

A: Yes. BK/HTB-46I-R is a direct substitute with identical electrical ratings (20 A, 250V), mechanical dimensions (0.25" Dia x 1.26" L), fuse type (Cartridge), and termination style (Quick Connect - 0.250"). Both parts accommodate 3AG, 1/4" x 1-1/4" (SFE-20) fuses. The primary difference is the updated RoHS compliance designation (ROHS3 versus RoHS Compliant).

Q: Is 03420858H compatible with the same fuse cartridges as BK/HTB-46I?

A: Yes. The 03420858H maintains identical fuse size (0.25" Dia x 1.26" L) and compatible fuse standard (3AG, 1/4" x 1-1/4" SFE-20), ensuring compatibility with the same cartridge fuses. Electrical ratings are also identical (20 A, 250V).

Q: Why does BK1-HTJ-606I appear in the substitute list if it has a different current rating?

A: BK1-HTJ-606I is listed as a similar alternative rather than a direct substitute due to its reduced current rating (10 A versus 20 A) and different termination style (Solder Lug versus Quick Connect). This part is suitable only for applications requiring 10 A protection and solder lug connections. Circuit design verification is required before implementation.

Q: What is the difference between Quick Connect and Solder Lug termination?

A: Quick Connect termination (0.250" / 6.3mm) uses a push-on connector interface for rapid assembly and disassembly without soldering. Solder Lug termination requires permanent solder connections to the circuit board or wiring. These termination styles are not interchangeable without circuit redesign.

Q: Are all substitute parts RoHS compliant?

A: Yes. BK/HTB-46I is RoHS Compliant, BK/HTB-46I-R is ROHS3 Compliant, BK1-HTJ-606I is RoHS Compliant, and 03420858H is ROHS3 Compliant. All parts meet RoHS requirements for hazardous substance restrictions.

Q: Can I use 03420858H (Littelfuse) in place of BK/HTB-46I (Eaton) without circuit modifications?

A: Yes. The 03420858H is a direct substitute with identical electrical specifications (20 A, 250V), mechanical dimensions (0.25" Dia x 1.26" L), fuse type (Cartridge), and termination style (Quick Connect - 0.250"). No circuit modifications are required. The primary difference is the manufacturer (Littelfuse Inc. versus Eaton - Electronics Division).

Q: What inventory levels are available for each substitute part?

A: BK/HTB-46I has 651 pieces in stock, BK/HTB-46I-R has 2316 pieces in stock, BK1-HTJ-606I has 1700 pieces in stock, and 03420858H has 991 pieces in stock. Inventory levels should be verified at the time of procurement.