Eaton BK/CBC-20B Automotive Circuit Breaker - 1.5 kAIC
Part Number: BK/CBC-20B
Quick Summary
The BK/CBC-20B automotive circuit breaker protects automotive electrical circuits in demanding environments. Engineers often struggle to fit reliable overcurrent protection into compact dashboards and harnesses. Key certifications to verify include CE, UL, and IP-related ratings, with factory confirmation for this SKU. This unit delivers 20 A at 14 Vdc with a 1.5 kAIC interrupt rating and a rugged #10-32 stud, enabling robust protection in OEM and aftermarket installations. Packaging of 100 and the CBC-B series deliver scalable inventory for distributors and technicians seeking durable, easy-to-install protection. Its heavy-duty design reduces nuisance trips in vibration-prone automotive environments. Selecting the right breaker improves vehicle uptime and maintenance cost. This 14 Vdc solution aligns with common automotive architectures and battery management approaches.
Product Information
Extended Description
BK/CBC-20B Eaton: Eaton Bussmann series CBC-B automotive circuit breaker, Packaging quantity 100, 14 Vdc, 20 A, 1.5 kAIC, Type I, Heavy duty, 10-32 TPI stud
Product Name
Eaton Bussmann series CBC-B automotive circuit breaker
Catalog Number
BK/CBC-20B
UPC
051712556576
Product Length/Depth
0.84 in
Product Height
1.35 in
Product Width
1.46 in
Product Weight
0.5 lb
Compliances
Contact factory
Amperage Rating
20 A
Interrupt rating
1.5 kAIC
Voltage rating
14 Vdc
Connection
#10-32 TPI stud
Quantity
6
Special features
Packaging quantity 100
Bussmann series 4-foot automotive planogram no.10730
BK/CBC-20B~BK-CBC-20B~CIRCUIT BREAKER
BK/CBC-20B~BK-CBC-20B~CIRCUIT BREAKER
Bussmann series Fuseology
Eaton Specification Sheet - BK/CBC-20B
Feature: 14 Vdc operating voltage enables direct integration with common automotive electrical systems. Business Impact: Facilitates reliable protection without converters or extra power stages, reducing wiring complexity. Application: OEM harnesses and aftermarket installations where space is tight and system voltage is nominally 12–14 V. Feature: 20 A current rating provides precise overcurrent protection for branch circuits. Business Impact: Limits conductor damage and battery drain while minimizing nuisance trips in normal operation. Application: power distribution lines, lighting circuits, and accessory feeds in vehicles and heavy equipment. Feature: 1.5 kAIC interrupt rating ensures fast fault clearing under high fault currents. Business Impact: Protects wiring insulation and downstream devices, reducing collateral damage and repair costs. Application: high-current automotive circuits and starter/solenoid lines. Feature: #10-32 TPI stud connection supports quick, secure terminations. Business Impact: Simplifies installation, reduces torque concerns, and improves vibration resistance. Application: common automotive lugs and bus bars in OEM assemblies. Feature: Type I heavy-duty construction delivers rugged performance in vibration and environmental exposure. Business Impact: Extends service life in commercial vehicles, construction equipment, and off-road applications. Application: harsh-duty automotive environments with repeated shocks and temperature swings. Feature: Packaging quantity of 100 enables scalable stocking for distributors and service centers. Business Impact: Lowers per-unit carrying costs and improves lead times for high-volume projects. Application: fleet maintenance programs and aftermarket retail channels.
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FAQs
The BK/CBC-20B uses a standard #10-32 TPI stud for terminal connections, enabling straightforward bolt-on installation with common automotive lugs. Ensure the mounting surface is clean and rigid to minimize vibration-induced wear. Verify clearances for 1.46 in width and 1.35 in height, and use torque values recommended by Eaton for secure, reliable connections.
The 1.5 kAIC interrupt rating defines the maximum fault current the breaker can interrupt, so circuits experiencing short circuits or severe overloads are cleared quickly to prevent insulation damage and downstream component failure. This rating is particularly important for high-current automotive feeders and starter circuits where fault currents can spike.
Yes, the BK/CBC-20B is designed for 14 V automotive systems. It features a 20 A rating and a #10-32 TPI stud connection, supporting secure terminations with typical automotive lugs and bus bars. This combination provides reliable protection while simplifying installation in constrained spaces.
This CBC-B automotive circuit breaker is ideal for OEM harness protection, heavy equipment power feeds, and aftermarket installations where space and vibration resistance matter. Compared with lighter-duty breakers, the BK/CBC-20B offers higher fault tolerance (1.5 kAIC) and rugged construction, along with packaging of 100 for scalable inventory management.
Using the BK/CBC-20B reduces nuisance trips due to its heavy-duty design and adequate interrupt rating, which translates to fewer electrical faults and less downtime. The 14 Vdc, 20 A rating aligns with common vehicle electrical architectures, supporting longer service life for wiring and components while lowering replacement costs in fleets and service operations.