BK/HTB-56I Cartridge Fuse Holder Equivalent & Substitute Parts

Part Overview

The BK/HTB-56I 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 measuring 0.25" diameter by 1.26" length (6.35mm x 32mm). The part is classified as obsolete, necessitating identification of equivalent substitute components for ongoing system maintenance and new design implementations. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and termination specifications to ensure direct functional replacement.

Substiute Parts

BK/HTB-56I

Eaton - Electronics DivisionIn Stock: 858BK/HTB-56I Datasheet

Current PartRFQ

BK/HTB-56I-R

Eaton - Electronics DivisionIn Stock: 1381BK/HTB-56I-R Datasheet

DirectRFQ

03453HS8H

Littelfuse Inc.In Stock: 82103453HS8H Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BK/HTB-56I are qualified based on strict equivalence across the following parameters:

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

All identified substitute parts meet these criteria, enabling direct replacement without circuit modification or mechanical redesign.

Parameter Comparison

Engineering Selection Recommendations

BK/HTB-56I-R (Eaton - Electronics Division)

The BK/HTB-56I-R is the direct manufacturer equivalent produced by Eaton - Electronics Division. This part maintains identical electrical and mechanical specifications to the obsolete BK/HTB-56I while offering active product status and ROHS3 compliance. Selection of this part eliminates supply chain risk and ensures manufacturer support continuity. Inventory availability is 1321 pieces in new original condition.

03453HS8H (Littelfuse Inc.)

The 03453HS8H is a cross-manufacturer substitute produced by Littelfuse Inc. This part satisfies all electrical and mechanical equivalence requirements with identical current rating, voltage rating, fuse size, and termination specifications. The 03453HS8H provides ROHS3 compliance and active product status. Contact material is specified as Copper Alloy with Tin finish. Inventory availability is 780 pieces in new original condition. This option is suitable for applications where multi-source component qualification is required.

Frequently Asked Questions (FAQ)

Q: Can BK/HTB-56I-R be used as a direct replacement for BK/HTB-56I?

A: Yes. The BK/HTB-56I-R maintains identical electrical ratings (20 A, 250V), mechanical dimensions (0.25" Dia x 1.26" L), fuse type (Cartridge 3AG), and termination style (Quick Connect - 0.250"). No circuit modification or mechanical redesign is required.

Q: What is the difference between BK/HTB-56I-R and 03453HS8H?

A: Both parts are electrically and mechanically equivalent. The primary differences are manufacturer (Eaton vs. Littelfuse) and contact material specification (not provided for BK/HTB-56I-R vs. Copper Alloy with Tin finish for 03453HS8H). Both are ROHS3 compliant and active products.

Q: Are these substitutes compatible with 3AG fuses?

A: Yes. All three parts are designed for 3AG cartridge fuses with dimensions 0.25" diameter by 1.26" length (6.35mm x 32mm), designated as 1/4" x 1-1/4" (SFE-20).

Q: What is the packaging difference between substitute parts?

A: BK/HTB-56I-R and 03453HS8H are supplied in Bulk packaging. Original BK/HTB-56I packaging information is not specified in available data.

Q: Are all substitute parts RoHS compliant?

A: BK/HTB-56I-R and 03453HS8H are both ROHS3 compliant. The original BK/HTB-56I is RoHS non-compliant. For applications requiring RoHS compliance, substitute parts must be selected.

Q: Can these fuse holders be used interchangeably in existing designs?

A: Yes. Identical mounting type (Panel Mount), termination style (Quick Connect - 0.250"), and electrical specifications enable direct interchangeability without design modification.