BK/HTB-66I Fuse Holder Cartridge 250V 20A Panel Mount - Equivalent & Substitute Parts

Part Overview

The BK/HTB-66I is a cartridge fuse holder manufactured by Eaton - Electronics Division, designed for panel mount applications. This component accommodates 3AG cartridge fuses rated at 20 amperes and 250 volts, with a single circuit configuration. The fuse holder features quick connect termination (0.250" / 6.3mm) and is compatible with standard 0.25" diameter by 1.26" length (6.35mm x 32mm) cartridge fuses.

The BK/HTB-66I is classified as an active product with 1014 pieces currently in stock. Identification of equivalent and substitute parts is necessary to ensure supply chain continuity, support design flexibility, and accommodate varying compliance requirements across different manufacturing and distribution channels.

Substiute Parts

BK/HTB-66I

Eaton - Electronics DivisionIn Stock: 1123BK/HTB-66I Datasheet

Current PartRFQ

BK/HTB-66I-R

Eaton - Electronics DivisionIn Stock: 1129BK/HTB-66I-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BK/HTB-66I 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)
• Mounting Type: Panel Mount (exact match required)
• Termination Style: Quick Connect - 0.250" (6.3mm) (exact match required)
• Fuse Type: Cartridge (exact match required)

Compatibility Parameters:

• Compatible Fuse Standard: 3AG, 1/4" x 1-1/4" (SFE-20) (exact match required)
• Manufacturer: Eaton - Electronics Division (same manufacturer required)
• Series: HTB (same series required)

The substitute part BK/HTB-66I-R meets all electrical, mechanical, and compatibility requirements and is therefore classified as a direct equivalent.

Parameter Comparison

Engineering Selection Recommendations

BK/HTB-66I (Original Part Number)

The BK/HTB-66I is suitable for applications where RoHS non-compliance is acceptable or where legacy component specifications are required. This part number maintains full electrical and mechanical compatibility with all specified fuse standards and mounting configurations. Current inventory of 1014 pieces supports immediate availability for production requirements.

BK/HTB-66I-R (Substitute Part Number)

The BK/HTB-66I-R is the preferred selection for applications subject to ROHS3 compliance requirements. This variant maintains identical electrical performance, mechanical dimensions, and functional characteristics to the BK/HTB-66I while meeting current regulatory compliance standards. The REACH Unaffected status provides additional regulatory clarity for international distribution. Current inventory of 1070 pieces ensures supply continuity. Selection of BK/HTB-66I-R is appropriate for new designs, redesigns, or applications where compliance documentation is required.

Substitution Basis

Both part numbers are manufactured by Eaton - Electronics Division within the HTB series and are classified as active products. The substitution is based on complete electrical equivalence (20A, 250V, single circuit), mechanical interchangeability (identical fuse size, mounting type, and termination), and functional compatibility with 3AG cartridge fuse standards. The primary differentiation is regulatory compliance status, not performance or physical characteristics.

Frequently Asked Questions (FAQ)

Q: Can BK/HTB-66I-R be used as a direct replacement for BK/HTB-66I in existing designs?

A: Yes. The BK/HTB-66I-R is electrically and mechanically identical to the BK/HTB-66I. Both accommodate the same 20A, 250V cartridge fuses, feature identical panel mount configuration, and use the same 0.250" quick connect termination. Physical dimensions and fuse compatibility are unchanged.

Q: What is the primary difference between BK/HTB-66I and BK/HTB-66I-R?

A: The primary difference is regulatory compliance. BK/HTB-66I-R is ROHS3 compliant and REACH Unaffected, while BK/HTB-66I is RoHS non-compliant. All electrical, mechanical, and functional specifications are identical.

Q: Are both part numbers compatible with 3AG cartridge fuses?

A: Yes. Both BK/HTB-66I and BK/HTB-66I-R are designed for use with 3AG cartridge fuses rated 1/4" x 1-1/4" (SFE-20 standard), with dimensions of 0.25" diameter by 1.26" length (6.35mm x 32mm).

Q: What termination type do these fuse holders use?

A: Both part numbers feature Quick Connect termination with 0.250" (6.3mm) spade connectors, suitable for standard panel mount electrical connections.

Q: Can these fuse holders accommodate different current ratings?

A: No. Both BK/HTB-66I and BK/HTB-66I-R are rated specifically for 20 amperes at 250 volts. They are not suitable for different current or voltage ratings.

Q: Is there a difference in packaging between the two part numbers?

A: Both part numbers are supplied in bulk packaging. No difference in packaging configuration exists between BK/HTB-66I and BK/HTB-66I-R.

Q: Which part number should be selected for new product designs?

A: BK/HTB-66I-R is appropriate for new designs requiring ROHS3 compliance documentation. BK/HTB-66I may be selected where compliance requirements do not apply or where legacy specifications are mandated.