Equivalent & Substitute Parts for BK/HTB-42I-R

Part Overview

The BK/HTB-42I-R is a cartridge fuse holder manufactured by Eaton - Electronics Division, rated for 20 A at 250V with panel mount configuration. This single-circuit holder accommodates 0.25" diameter by 1.26" length cartridge fuses (6.35mm x 32mm) and features quick connect termination. The product is active in production status and RoHS compliant, making it suitable for industrial and commercial electrical protection applications where component availability or supply chain requirements necessitate equivalent alternatives.

Substiute Parts

BK/HTB-42I-R

Eaton - Electronics DivisionIn Stock: 1113BK/HTB-42I-R Datasheet

Current PartRFQ

BK1-HTJ-602I

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

SimilarRFQ

03420012H

Littelfuse Inc.In Stock: 150003420012H Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for cartridge fuse holders is determined by strict alignment of electrical and mechanical parameters. The primary criteria are:

Critical Parameters for Substitution:

• Voltage rating (must equal or exceed 250V)
• Current rating (must equal or exceed 20 A)
• Fuse size accommodation (0.25" diameter x 1.26" length)
• Fuse type (cartridge format)
• Number of circuits (single circuit)
• Mounting configuration (panel mount)
• Compliance certifications (RoHS status)

Two substitute parts are identified based on these parameters:

BK1-HTJ-602I (Eaton - Electronics Division): This part shares the same voltage rating (250V), cartridge fuse type, single-circuit configuration, and panel mount design. However, the current rating is 10 A, which is lower than the main part's 20 A rating. The fuse size is specified as 0.250" diameter without length specification. Termination differs (solder lug versus quick connect). This part is suitable only where lower current protection is acceptable.

03420012H (Littelfuse Inc.): This part matches the main part in current rating (20 A), voltage rating (250V), fuse size (0.25" Dia x 1.26" L), cartridge type, single-circuit configuration, and panel mount design. Termination style differs (solder lug versus quick connect). Contact materials and finishes differ (brass with tin finish versus unspecified in main part). This part is a direct functional equivalent with compatible electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Equivalent: 03420012H (Littelfuse Inc.)

The 03420012H is the direct functional equivalent to BK/HTB-42I-R. Both parts share identical electrical ratings (20 A, 250V), fuse size specifications (0.25" Dia x 1.26" L), and mechanical configuration (single-circuit, panel mount, cartridge type). Both maintain active product status and RoHS compliance. The primary difference is termination style: the main part uses quick connect terminals while the substitute uses solder lug termination. This difference requires circuit board or panel design accommodation but does not affect electrical performance or safety ratings. ROHS3 compliance of the substitute exceeds the RoHS compliance of the main part.

Secondary Equivalent: BK1-HTJ-602I (Eaton - Electronics Division)

The BK1-HTJ-602I shares manufacturer origin, voltage rating, fuse type, circuit count, and mounting configuration with the main part. However, the current rating is 10 A, which is 50% lower than the main part's 20 A rating. This part is suitable only for applications where the circuit protection requirement is 10 A or lower. The fuse size specification lacks length detail. Termination is solder lug. This part should be selected only when current rating reduction is acceptable for the application.

Both substitute parts are active products with appropriate compliance certifications and documented inventory availability.

Frequently Asked Questions (FAQ)

Q: Can BK1-HTJ-602I replace BK/HTB-42I-R in all applications?

A: No. The BK1-HTJ-602I has a 10 A current rating compared to the main part's 20 A rating. Substitution is valid only in circuits designed for 10 A protection. Using a 10 A holder in a 20 A circuit creates inadequate protection.

Q: What is the primary difference between BK/HTB-42I-R and 03420012H?

A: The electrical and mechanical specifications are identical (20 A, 250V, 0.25" x 1.26" cartridge, single circuit, panel mount). The termination method differs: BK/HTB-42I-R uses quick connect terminals (0.187" spade), while 03420012H uses solder lug termination. Circuit board or panel design must accommodate the appropriate termination type.

Q: Are both substitute parts RoHS compliant?

A: Yes. BK1-HTJ-602I is RoHS Compliant. 03420012H is ROHS3 Compliant, which represents a more recent compliance standard. Both meet RoHS requirements.

Q: Can I use 03420012H as a direct drop-in replacement?

A: Electrical and mechanical compatibility is confirmed. However, termination style differs (solder lug versus quick connect). Physical installation requires verification that the circuit board or panel layout accommodates solder lug connections. No electrical performance degradation occurs with this substitution.

Q: What fuse types are compatible with these holders?

A: All three parts accommodate 3AG cartridge fuses in 1/4" x 1-1/4" format (0.25" Dia x 1.26" L). The main part and 03420012H explicitly reference SFE-20 fuse compatibility.

Q: Is inventory availability a factor in substitution selection?

A: Yes. BK/HTB-42I-R has 1003 pieces in stock, BK1-HTJ-602I has 1277 pieces, and 03420012H has 1433 pieces. All three parts are available for immediate procurement.