BK/HTB-24-R Equivalent & Substitute Parts

Part Overview

The BK/HTB-24-R is a cartridge fuse holder manufactured by Eaton - Electronics Division, rated for 20 A at 250V with panel mount configuration. This component is designed for single-circuit applications using 3AG cartridge fuses (0.25" Dia x 1.26" L). The product is currently obsolete, making identification of equivalent substitute parts essential for maintenance, repair, and replacement applications in existing installations.

Substiute Parts

BK/HTB-24-R

Eaton - Electronics DivisionIn Stock: 969BK/HTB-24-R Datasheet

Current PartRFQ

03420012H

Littelfuse Inc.In Stock: 150003420012H Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BK/HTB-24-R is determined by strict equivalence 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)

Interface Parameters:

• Compatible Fuse Standard: 3AG, 1/4" x 1-1/4" (SFE-20) (exact match required)

The substitute part 03420012H from Littelfuse Inc. meets all critical electrical and mechanical parameters. Differences in termination style (Solder Lug vs. Quick Connect), contact material, and contact finish do not affect functional equivalence when the fuse holder is used in applications where the original termination method can be adapted or replaced.

Parameter Comparison

Engineering Selection Recommendations

The 03420012H from Littelfuse Inc. is a direct functional equivalent to the obsolete BK/HTB-24-R based on matching electrical ratings (20 A, 250V), mechanical dimensions (0.25" Dia x 1.26" L cartridge format), and circuit configuration (single circuit, panel mount).

Advantages of 03420012H:

• Active product status ensures ongoing availability and supply chain continuity
• ROHS3 compliance meets current environmental and regulatory standards
• Identical fuse compatibility (3AG, 1/4" x 1-1/4" SFE-20 standard)
• Higher inventory availability (1433 pcs vs. 904 pcs for original part)

Installation Consideration: The primary difference is termination style: the original BK/HTB-24-R uses Quick Connect terminals (0.187" / 4.7mm), while the 03420012H uses Solder Lug termination. Circuit board or panel integration must accommodate this difference through either adapter solutions or direct soldering methods.

Frequently Asked Questions (FAQ)

Q: Can the 03420012H directly replace the BK/HTB-24-R without modification?

A: The 03420012H is electrically and mechanically equivalent. However, the termination method differs: the original uses Quick Connect terminals while the substitute uses Solder Lug. Direct physical replacement requires either an adapter or modification of the connection method on the circuit board or panel.

Q: Are the fuse cartridges interchangeable between these two holders?

A: Yes. Both holders accept the same 3AG cartridge fuse standard (1/4" x 1-1/4" / 6.35mm x 32mm). Any 20 A rated 3AG fuse compatible with 250V operation will function in either holder.

Q: What is the significance of the different contact materials and finishes?

A: The 03420012H specifies Brass contacts with Tin finish, while the original BK/HTB-24-R does not specify these details. Brass with Tin finish is a standard industrial contact material combination that provides corrosion resistance and reliable electrical conductivity. This does not affect functional equivalence.

Q: Is the 03420012H suitable for new designs or only as a replacement for obsolete equipment?

A: The 03420012H is an active product from Littelfuse Inc. and is suitable for both replacement applications and new designs. Its ROHS3 compliance makes it appropriate for applications requiring current environmental standards compliance.

Q: What is the difference between the packaging specifications?

A: The original BK/HTB-24-R packaging is listed as "-" (not specified), while the 03420012H is supplied in Bulk packaging. This affects order quantities and handling but does not impact the component's electrical or mechanical performance.

Q: Are there any compliance or certification differences between these parts?

A: Both parts share the same ECCN (EAR99) and HTSUS (8538.90.8180) classifications. The 03420012H includes ROHS3 compliance and REACH Unaffected status, providing additional regulatory documentation for modern applications. The original part's compliance status is not fully specified.