Equivalent & Substitute Parts for BK/ABC-20 Ceramic Cartridge Fuse

Part Overview

The BK/ABC-20 is a 20 A ceramic cartridge fuse rated for 250 V AC and 125 V DC operation with fast-blow response characteristics. This component is classified as obsolete, requiring identification of active equivalent alternatives for continued system support and procurement. The fuse is designed for use with 3AB and 3AG holders and features a 1/4" x 1-1/4" form factor. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and breaking capacity specifications to ensure direct compatibility in existing circuit protection applications.

Substiute Parts

BK/ABC-20

Eaton - Electronics DivisionIn Stock: 951BK/ABC-20 Datasheet

Current PartRFQ

BK/ABC-20-R

Eaton - Electronics DivisionIn Stock: 1731BK/ABC-20-R Datasheet

DirectRFQ

ABC-20-R

Eaton - Electronics DivisionIn Stock: 987ABC-20-R Datasheet

Parametric EquivalentRFQ

BK/ABC-20RX

Eaton - Electronics DivisionIn Stock: 1013BK/ABC-20RX Datasheet

Parametric EquivalentRFQ

BK/GBB-20-R

Eaton - Electronics DivisionIn Stock: 1525BK/GBB-20-R Datasheet

Parametric EquivalentRFQ

BK1/ABC-20EX-R

Eaton - Electronics DivisionIn Stock: 835BK1/ABC-20EX-R Datasheet

Parametric EquivalentRFQ

GBB-20-R

Eaton - Electronics DivisionIn Stock: 803GBB-20-R Datasheet

Parametric EquivalentRFQ

0001.1037

SCHURTER Inc.In Stock: 7650001.1037 Datasheet

SimilarRFQ

0314020.HXP

Littelfuse Inc.In Stock: 15940314020.HXP Datasheet

Parametric EquivalentRFQ

0314020.MXP

Littelfuse Inc.In Stock: 81230314020.MXP Datasheet

Parametric EquivalentRFQ

0314020.VXP

Littelfuse Inc.In Stock: 11170314020.VXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BK/ABC-20 is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

• Current Rating: 20 A (exact match required)
• Voltage Rating - AC: 250 V (exact match required)
• Voltage Rating - DC: 125 V (exact match required)
• Fuse Type: Cartridge, Ceramic (exact match required)
• Response Time: Fast Blow (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 (exact match required)

Secondary Compatibility Parameters:

• Breaking Capacity @ Rated Voltage: 400A AC minimum, 10kA DC minimum
• Melting I²t: 550.8 nominal
• DC Cold Resistance: 0.00366 Ohms nominal
• Mounting Type: Requires Holder (exact match required)

Substitute parts are classified into two categories:

Direct Manufacturer Equivalents (Eaton - Electronics Division): Parts BK/ABC-20-R, ABC-20-R, BK/ABC-20RX, BK1/ABC-20EX-R, BK/GBB-20-R, and GBB-20-R maintain all primary equivalence criteria and are sourced from the original manufacturer. These parts differ primarily in product status (active vs. obsolete), packaging configuration (bulk vs. standard), and RoHS compliance level.

Cross-Manufacturer Parametric Equivalents (Littelfuse Inc.): Parts 0314020.HXP, 0314020.MXP, and 0314020.VXP satisfy all primary equivalence criteria and maintain compatibility with existing holder assemblies. These parts are from an alternative manufacturer and feature different melting I²t values (631 vs. 550.8) and operating temperature ranges (-55°C ~ 125°C vs. unspecified).

Similar Type (Not Direct Substitute): Part 0001.1037 (SCHURTER Inc.) is a glass cartridge fuse with identical current and voltage ratings but differs in fuse material composition and breaking capacity (1kA vs. 400A AC). This part is classified as similar type only and is not a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

Tier 1 - Direct Manufacturer Substitutes (Recommended for Primary Selection):

BK/ABC-20-R, ABC-20-R, and BK1/ABC-20EX-R are the preferred substitutes. These parts are manufactured by Eaton - Electronics Division, the original equipment manufacturer, and maintain complete electrical and mechanical equivalence to the obsolete BK/ABC-20. All three parts are active products with ROHS3 compliance certification. BK/ABC-20-R and ABC-20-R are functionally identical, differing only in packaging designation. BK1/ABC-20EX-R provides identical performance with extended environmental qualification. These parts carry CSA and UL approval agencies consistent with the original specification.

Tier 2 - Alternative Eaton Series (Secondary Selection):

BK/ABC-20RX, BK/GBB-20-R, and GBB-20-R are active Eaton products that satisfy primary equivalence criteria. BK/ABC-20RX maintains the ABC series designation with identical breaking capacity (400A AC, 10kA DC). BK/GBB-20-R and GBB-20-R represent the GBB series variant with reduced AC breaking capacity (200A vs. 400A) and slightly lower DC cold resistance (0.0033 Ohms vs. 0.00366 Ohms). These parts are suitable for applications where the reduced breaking capacity is acceptable within the circuit design margins.

Tier 3 - Cross-Manufacturer Parametric Equivalents (Alternative Sourcing):

Littelfuse parts 0314020.HXP, 0314020.MXP, and 0314020.VXP provide parametric equivalence from an alternative manufacturer. All three maintain the required 20 A, 250 V AC, 125 V DC ratings and ceramic cartridge construction. These parts feature higher melting I²t values (631 vs. 550.8) and extended operating temperature range (-55°C ~ 125°C). 0314020.HXP and 0314020.MXP provide 200A AC breaking capacity, while 0314020.VXP provides 1kA AC breaking capacity. All three carry multiple approval agencies (CE, CSA, PSE, UL) and ROHS3 compliance. These parts are suitable for applications requiring alternative supplier qualification or extended environmental performance.

Not Recommended:

Part 0001.1037 (SCHURTER Inc.) is a glass cartridge fuse and is not a direct substitute due to material composition differences and reduced breaking capacity (1kA vs. 400A AC). This part is classified as similar type only and should not be used as a replacement for the ceramic cartridge specification.

Frequently Asked Questions (FAQ)

Q: Can BK/ABC-20-R be used as a direct replacement for the obsolete BK/ABC-20?

A: Yes. BK/ABC-20-R is a direct substitute manufactured by Eaton - Electronics Division. It maintains identical electrical ratings (20 A, 250 V AC, 125 V DC), fuse type (ceramic cartridge), response time (fast blow), mechanical dimensions (0.250" Dia x 1.250" L), breaking capacity (400A AC, 10kA DC), and holder compatibility (3AB, 3AG). The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 compliant vs. non-compliant).

Q: What is the difference between BK/ABC-20-R and ABC-20-R?

A: Both parts are manufactured by Eaton - Electronics Division and are electrically and mechanically identical. The difference is in packaging designation. BK/ABC-20-R and ABC-20-R can be used interchangeably in the same application. Both are active products with ROHS3 compliance.

Q: Can Littelfuse 0314020.HXP be used instead of an Eaton part?

A: Yes, with engineering review. The Littelfuse 0314020.HXP maintains all primary equivalence criteria: 20 A current rating, 250 V AC and 125 V DC voltage ratings, ceramic cartridge construction, fast-blow response, and 3AB/3AG holder compatibility. However, it differs in melting I²t (631 vs. 550.8) and DC cold resistance (0.00355 Ohms vs. 0.00366 Ohms). The breaking capacity is 200A AC (vs. 400A AC for the original). This part is suitable for applications where the reduced breaking capacity is within design margins and alternative manufacturer qualification is acceptable.

Q: Why do some substitute parts have different breaking capacities?

A: Breaking capacity is determined by the fuse element design and ceramic body construction. Parts with identical current and voltage ratings may have different breaking capacities based on manufacturer design specifications. BK/GBB-20-R and GBB-20-R have 200A AC breaking capacity, while BK/ABC-20-R has 400A AC breaking capacity. Selection should be based on the circuit protection requirements of the specific application.

Q: Are all substitute parts RoHS compliant?

A: The original BK/ABC-20 is RoHS non-compliant. All active substitute parts listed (BK/ABC-20-R, ABC-20-R, BK1/ABC-20EX-R, BK/GBB-20-R, GBB-20-R, and all Littelfuse 314 series parts) are ROHS3 compliant. This compliance status should be verified against system-level RoHS requirements.

Q: What approval agencies are required for this fuse?

A: The original BK/ABC-20 carries CSA and UL approvals. Substitute parts maintain these certifications: Eaton parts carry CSA and UL (or UR); Littelfuse parts carry CE, CSA, PSE, and UL (or KC for 0314020.VXP). Verify that the selected substitute meets the specific approval agency requirements of the end application.

Q: Can the glass cartridge fuse 0001.1037 replace the ceramic cartridge BK/ABC-20?

A: No. Although 0001.1037 has the same 20 A current rating and 250 V AC voltage rating, it is a glass cartridge fuse, not ceramic. It has a lower breaking capacity (1kA vs. 400A AC) and different thermal characteristics. This part is classified as similar type only and is not a direct substitute.

Q: What is the significance of the melting I²t parameter?

A: Melting I²t is a measure of the thermal energy required to melt the fuse element and is used to characterize fuse response time and selectivity. The original BK/ABC-20 has a melting I²t of 550.8. Littelfuse parts have a melting I²t of 631, indicating slightly different thermal response characteristics. For applications with specific coordination requirements, the melting I²t difference should be evaluated against system protection schemes.

Q: Are all substitute parts available in the same package size?

A: Yes. All substitute parts maintain the 3AB, 3AG, 1/4" x 1-1/4" (0.250" Dia x 1.250" L) form factor and are compatible with standard fuse holders designed for this package size. Mechanical interchangeability is guaranteed across all listed substitutes.