BK8/ABC-18-R Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The BK8/ABC-18-R is an 18 A, 250 V AC/DC ceramic cartridge fuse manufactured by Eaton - Electronics Division. This fuse is designed for use in 3AB and 3AG holder configurations with a 1/4" x 1-1/4" form factor and provides fast-blow response characteristics. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives for continued circuit protection applications. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and approval certifications to ensure direct compatibility in existing fuse holder assemblies.

Substiute Parts

BK8/ABC-18-R

Eaton - Electronics DivisionIn Stock: 940BK8/ABC-18-R Datasheet

Current PartRFQ

BK/ABC-18-R

Eaton - Electronics DivisionIn Stock: 1597BK/ABC-18-R Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete BK8/ABC-18-R is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

• Current Rating: 18 A (exact match required)
• Voltage Rating - AC: 250 V (exact match required)
• Response Time: Fast Blow (exact match required)
• Breaking Capacity @ Rated Voltage: 400 A (exact match required)
• Melting I²t: 400 (exact match required)
• DC Cold Resistance: 0.00465 Ohms (exact match required)

Mechanical Parameters:

• Fuse Type: Cartridge, Ceramic (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Size / Dimension: 0.250" Dia x 1.250" L / 6.35mm x 31.75mm (exact match required)

Compliance Parameters:

• Approval Agency: CSA, UL (exact match required)
• RoHS Status: ROHS3 Compliant (exact match required)

The substitute part BK/ABC-18-R meets all specified criteria and is classified as active product status, providing a direct replacement for the obsolete BK8/ABC-18-R.

Parameter Comparison

Engineering Selection Recommendations

The BK/ABC-18-R is the direct equivalent substitute for the obsolete BK8/ABC-18-R. Selection is based on the following engineering criteria:

Product Status: The substitute part BK/ABC-18-R maintains active product status with Eaton - Electronics Division, ensuring continued availability and supply chain reliability compared to the obsolete BK8/ABC-18-R.

Electrical and Mechanical Equivalence: All critical electrical parameters (18 A current rating, 250 V AC voltage rating, 400 A breaking capacity, 400 melting I²t, 0.00465 Ohms DC cold resistance) and mechanical specifications (3AB/3AG cartridge form factor, 0.250" Dia x 1.250" L dimensions) are identical between the main part and substitute.

Compliance and Certifications: Both parts carry identical CSA and UL approvals and maintain ROHS3 compliance, confirming regulatory equivalence for circuit protection applications.

Holder Compatibility: The substitute part requires the same 3AB and 3AG holder configurations as the main part, enabling direct installation without mechanical modification.

Frequently Asked Questions (FAQ)

Q: Can BK/ABC-18-R be used as a direct replacement for BK8/ABC-18-R?

A: Yes. The BK/ABC-18-R is a direct equivalent substitute. All electrical ratings (18 A, 250 V AC), mechanical dimensions (0.250" Dia x 1.250" L), fuse type (ceramic cartridge), response characteristics (fast blow), and approval certifications (CSA, UL) are identical. The substitute is currently in active production status.

Q: What is the difference between BK8/ABC-18-R and BK/ABC-18-R?

A: The primary difference is product status. BK8/ABC-18-R is classified as obsolete, while BK/ABC-18-R is active. The electrical and mechanical specifications are identical. The packaging differs (BK8/ABC-18-R was supplied in standard packaging; BK/ABC-18-R is supplied in bulk packaging), but this does not affect functional performance.

Q: Will BK/ABC-18-R fit in the same fuse holder as BK8/ABC-18-R?

A: Yes. Both parts use identical 3AB and 3AG holder configurations with matching 1/4" x 1-1/4" form factors (6.35mm x 31.75mm). No holder modification or replacement is required.

Q: Are the breaking capacity and melting I²t ratings the same?

A: Yes. Both parts have a breaking capacity of 400 A at rated voltage and a melting I²t of 400, ensuring identical circuit protection performance.

Q: Do both parts meet the same regulatory approvals?

A: Yes. Both BK8/ABC-18-R and BK/ABC-18-R carry CSA and UL approvals and are ROHS3 compliant, confirming equivalent regulatory status for use in certified applications.

Q: What is the DC cold resistance specification?

A: Both parts have a DC cold resistance of 0.00465 Ohms, ensuring identical electrical characteristics during circuit operation.