Eaton BK/CB123-20HB Automotive Circuit Breaker - RoHS Compliant
Part Number: BK/CB123-20HB
Quick Summary
BK/CB123-20HB automotive circuit breaker from Eaton delivers reliable overcurrent protection for vehicle electrical systems. Engineers often confront space constraints and mounting compatibility challenges; this unit's compact 0.55 in depth and 10-32 TPI stud simplify wiring and serviceability. RoHS compliant with factory guidance, it is built for heavy-duty use under vibration and temperature extremes typical of automotive environments. With bracket and cover compatibility and quick-connect options, BK/CB123-20HB helps streamline harness layouts and reduce installation time, delivering lower total cost of ownership.
Product Information
Extended Description
BK/CB123-20HB Eaton: Eaton Bussmann series C.B.123-HB automotive circuit breaker, 20A, Heavy duty, Type III, 10-32 TPI stud
Product Name
Eaton Bussmann series CB123-HB automotive circuit breaker
Catalog Number
BK/CB123-20HB
UPC
051712614429
Product Length/Depth
0.55 in
Product Height
2.1 in
Product Width
1.7 in
Product Weight
0.44 lb
Compliances
RoHS Compliant Contact factory
Amperage Rating
20 A
Connection
#10-32 TPI stud
Quantity
6
Used with
lengthwise bracket and cover, quick-connect
Bussmann series 4-foot automotive planogram no.10730
BK/CB123-20HB~BK-CB123-20HB~CIRCUIT BREAKER
BK/CB123-20HB~BK-CB123-20HB~CIRCUIT BREAKER
Bussmann series Fuseology
Eaton Specification Sheet - BK/CB123-20HB
Feature: 20 A amperage rating. Business impact: Provides reliable overload protection, reducing the risk of downstream component damage and unplanned downtime in vehicle electrical systems. Application: Use in automotive main and branch circuits to safeguard sensors, actuators, and controllers within Bussmann series installations.Feature: Heavy-duty Type III construction. Business impact: Delivers rugged performance in high-vibration environments and temperature extremes, improving system reliability and service intervals. Application: Suitable for harsh automotive applications such as engine compartments and off-road equipment where durable protection matters.Feature: 10-32 TPI stud connections. Business impact: Ensures secure, low-resistance terminations and straightforward field wiring with consistent torque. Application: Ideal for integration with power distribution blocks and high-current harnesses in compact layouts.Feature: RoHS compliant. Business impact: Enables regulatory compliance and simpler supplier qualifications for OEM assemblies. Application: Fits green manufacturing programs and fleet installations requiring environmental responsibility.Feature: Compact dimensions (0.55 in depth Ă— 2.1 in height Ă— 1.7 in width). Business impact: Saves panel space and supports dense wiring patterns, reducing enclosure size and assembly time. Application: Enables efficient installation in limited-space automotive panels and instrument clusters.Feature: Bracket/cover compatibility and quick-connect readiness. Business impact: Accelerates mounting and reduces wiring complexity, cutting install time and field labor costs. Application: Streamlines incorporation into lengthwise bracket systems and quick-connect harnesses for rapid field service.
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FAQs
Installation begins with securing the unit in the designated automotive panel bay using the provided lengthwise bracket and cover. Connect the #10-32 TPI stud terminals to the corresponding power and load conductors, ensuring proper torque and clean connections. Verify alignment, confirm RoHS compliance, and test continuity with a low-current functional check before commissioning the circuit. The design supports quick-connect wiring for rapid field servicing.
The BK/CB123-20HB features heavy-duty Type III construction that resists vibration and wide temperature swings common in automotive environments. Its 20 A rating protects critical circuits without nuisance tripping, helping maintain uptime for essential systems like ignition, sensors, and controllers. This combination of rugged build and reliable protection is ideal for off-road or fleet applications where reliability is paramount.
Yes, the BK/CB123-20HB is RoHS compliant, aligning with environmental and regulatory requirements for modern electronics. This simplifies supplier certifications and OEM approval processes, reduces hazardous material concerns in assemblies, and supports green manufacturing programs. For field maintenance, it also helps ensure consistent material compliance across vehicle fleets.
The breaker measures 0.55 inches in depth, 2.1 inches in height, and 1.7 inches in width, with a #10-32 TPI stud connection. These specs support compact panel layouts and straightforward wiring in tight automotive enclosures. The stud connection offers a robust, low-resistance path for current while accommodating common automotive power harness designs.
BK/CB123-20HB is well-suited for vehicle power distribution where space is at a premium and reliable protection matters. It pairs with lengthwise brackets and covers and supports quick-connect wiring, making it ideal for dashboards, engine bays, and electronic control unit (ECU) power feeds. Its 20 A rating and rugged Type III construction make it a reliable choice for protecting sensors, actuators, and critical controllers.