BK/HTB-44I-R Equivalent & Substitute Parts

Part Overview

The BK/HTB-44I-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 0.25" diameter x 1.26" length cartridge fuses. The part is currently active in production with 903 units in stock.

Substitute parts are identified when equivalent electrical ratings, mechanical dimensions, and functional specifications align with the main part, enabling direct replacement in applications where the original part number is unavailable or supply constraints exist.

Substiute Parts

BK/HTB-44I-R

Eaton - Electronics DivisionIn Stock: 1000BK/HTB-44I-R Datasheet

Current PartRFQ

BK1-HTJ-602I

Eaton - Electronics DivisionIn Stock: 1341BK1-HTJ-602I Datasheet

SimilarRFQ

03420004HXL

Littelfuse Inc.In Stock: 103703420004HXL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BK/HTB-44I-R are classified based on the following critical parameters that determine functional equivalence:

Direct Substitutes share identical or equivalent electrical specifications:

• 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

The part 03420004HXL (Littelfuse Inc., Series 342) meets all critical electrical and mechanical parameters as a direct substitute. Both parts accommodate 3AG, 1/4" x 1-1/4" fuses and maintain identical voltage and current ratings.

Partial Substitutes share core electrical ratings but differ in secondary specifications:

• The BK1-HTJ-602I (Eaton - Electronics Division, Series HTJ) operates at 250V with panel mount configuration but is rated for 10 A current, which is below the 20 A requirement of the main part. This part is not suitable for direct replacement in 20 A applications.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitution (03420004HXL): The Littelfuse 03420004HXL is a direct electrical and mechanical equivalent to the BK/HTB-44I-R. Both parts are rated for 20 A at 250V, accommodate identical fuse dimensions (0.25" Dia x 1.26" L), and are configured for single-circuit panel mount applications. Both parts maintain ROHS3 compliance and REACH Unaffected status. The primary difference is termination style: the main part uses Quick Connect terminals while the substitute uses Solder Lug terminals. Selection between these parts depends on circuit board design and connection methodology. Both parts are active in production with adequate inventory levels.

Non-Substitution (BK1-HTJ-602I): The BK1-HTJ-602I is not suitable as a substitute for the BK/HTB-44I-R due to insufficient current rating. The BK1-HTJ-602I is rated for 10 A maximum, which is 50% below the 20 A requirement of the main part. While both parts share 250V voltage rating and panel mount configuration, the reduced current capacity makes this part incompatible with applications requiring 20 A protection. This part may be used only in circuits designed for 10 A or lower current protection.

Frequently Asked Questions (FAQ)

Q: Can the 03420004HXL replace the BK/HTB-44I-R in all applications?

A: The 03420004HXL is electrically and mechanically equivalent for 20 A, 250V cartridge fuse holder applications. The primary consideration is termination style: the main part features Quick Connect terminals (0.187" spade connectors), while the substitute uses Solder Lug terminals. Compatibility depends on whether your circuit board design accommodates solder lug connections. If your design requires Quick Connect terminals, the main part must be used.

Q: Why is the BK1-HTJ-602I listed as a substitute if it has a lower current rating?

A: The BK1-HTJ-602I is not a suitable substitute for the BK/HTB-44I-R. This part is listed in the source data but does not meet the critical 20 A current requirement. The BK1-HTJ-602I is rated for 10 A maximum and should only be used in applications specifically designed for 10 A protection. Using an undersized fuse holder creates safety and circuit protection failures.

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

A: Quick Connect terminals (0.187" spade connectors) on the BK/HTB-44I-R allow for push-on connection to mating terminals without soldering. Solder Lug terminals on the 03420004HXL require permanent solder connections to circuit board traces or wire leads. Quick Connect termination enables faster assembly and field replacement, while Solder Lug termination provides a permanent mechanical bond suitable for high-vibration environments.

Q: Are both the main part and 03420004HXL compliant with current regulations?

A: Yes. Both the BK/HTB-44I-R and 03420004HXL are ROHS3 compliant and REACH Unaffected, meeting current environmental and hazardous substance regulations for electronic components.

Q: What fuse types are compatible with these holders?

A: Both the BK/HTB-44I-R and 03420004HXL accommodate 3AG cartridge fuses with dimensions 1/4" diameter x 1-1/4" length (0.25" Dia x 1.26" L or 6.35mm x 32mm). Fuses must match these exact dimensions for proper fit and electrical contact.