BK/HTB-66-R Equivalent & Substitute Parts

Part Overview

The BK/HTB-66-R is a cartridge fuse holder manufactured by Eaton - Electronics Division, designed for panel mount applications with a 20 A current rating at 250V. This component accommodates 3AG cartridge fuses with dimensions of 0.25" diameter by 1.26" length (6.35mm x 32mm). The product is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing maintenance, repair, and system support applications where this holder type is specified in existing designs.

Substiute Parts

BK/HTB-66-R

Eaton - Electronics DivisionIn Stock: 785BK/HTB-66-R Datasheet

Current PartRFQ

03420838H

Littelfuse Inc.In Stock: 233503420838H Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BK/HTB-66-R is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

• Current Rating: 20 A
• Voltage Rating: 250V
• Fuse Size: 0.25" Dia x 1.26" L (6.35mm x 32mm)
• Fuse Type: Cartridge
• Number of Circuits: 1
• Mounting Type: Panel Mount
• Termination Style: Quick Connect - 0.250" (6.3mm)
• Compatible Fuse Standard: 3AG, 1/4" x 1-1/4" (SFE-20)

The substitute part 03420838H from Littelfuse Inc. meets all critical electrical and mechanical parameters, ensuring functional compatibility in applications originally designed for the BK/HTB-66-R.

Parameter Comparison

Engineering Selection Recommendations

The 03420838H from Littelfuse Inc. is the direct functional equivalent for the obsolete BK/HTB-66-R. Selection of this substitute is based on:

Electrical Equivalence: Both components share identical current rating (20 A), voltage rating (250V), and circuit configuration (1 circuit), ensuring electrical compatibility in the original application circuit.

Mechanical Compatibility: Fuse size, mounting type, and termination style are identical, confirming direct mechanical fit in panel mount installations designed for the BK/HTB-66-R.

Product Status: The 03420838H is classified as Active, providing ongoing availability and supply chain continuity compared to the obsolete BK/HTB-66-R.

Compliance: The 03420838H carries ROHS3 compliance certification, meeting current regulatory requirements for electronic components in many jurisdictions.

Availability: The 03420838H is available in higher inventory quantities (2276 Pcs), supporting both immediate replacement needs and future maintenance requirements.

Frequently Asked Questions (FAQ)

Q: Can the 03420838H directly replace the BK/HTB-66-R in existing installations?

A: Yes. The 03420838H meets all critical electrical and mechanical parameters: 20 A current rating, 250V voltage rating, identical fuse size (0.25" Dia x 1.26" L), cartridge fuse type, single circuit configuration, panel mount orientation, and Quick Connect 0.250" termination. Direct substitution is supported without circuit modification.

Q: What fuse types are compatible with both the BK/HTB-66-R and 03420838H?

A: Both holders accommodate 3AG cartridge fuses with dimensions 1/4" x 1-1/4" (SFE-20 standard). Fuse selection must maintain the 20 A current rating and 250V voltage rating for proper circuit protection.

Q: Are there packaging differences between the BK/HTB-66-R and 03420838H?

A: The BK/HTB-66-R is supplied in standard packaging, while the 03420838H is supplied in bulk packaging. This difference does not affect electrical or mechanical performance; it reflects inventory and distribution practices.

Q: Does the ROHS3 compliance of the 03420838H affect compatibility?

A: No. ROHS3 compliance indicates the 03420838H meets current environmental and regulatory standards. This certification does not alter electrical or mechanical function and supports use in applications with regulatory compliance requirements.

Q: What is the termination style, and does it differ between the two parts?

A: Both components use Quick Connect termination with 0.250" (6.3mm) connectors. This standardized termination ensures direct compatibility with existing wiring and connection infrastructure.