Eaton BK/CB123-50HB Automotive Circuit Breaker - Type III
Part Number: BK/CB123-50HB
Quick Summary
Automotive circuit breaker performance is critical to reliable vehicle electrical systems, and the Eaton BK/CB123-50HB delivers dependable protection. Engineers often contend with space constraints, wiring complexity, and mounting in harsh automotive environments. RoHS compliance ensures regulatory alignment, Type III protection delivers robust overload and short-circuit handling, and a sturdy #10-32 TPI stud supports secure, corrosion-resistant connections. Together with compact dimensions and Bussmann series lineage, it minimizes panel footprint while maximizing serviceability in both new builds and retrofit projects.
Product Information
Extended Description
BK/CB123-50HB Eaton: Eaton Bussmann series C.B.123-HB automotive circuit breaker, 50A, Heavy duty, Type III, 10-32 TPI stud
Product Name
Eaton Bussmann series CB123-HB automotive circuit breaker
Catalog Number
BK/CB123-50HB
UPC
051712614443
Product Length/Depth
0.55 in
Product Height
2.1 in
Product Width
1.7 in
Product Weight
0.44 lb
Compliances
Contact factory RoHS Compliant
Amperage Rating
50 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/CB123-50HB~BK-CB123-50HB~CIRCUIT BREAKER
BK/CB123-50HB~BK-CB123-50HB~CIRCUIT BREAKER
Bussmann series Fuseology
Eaton Specification Sheet - BK/CB123-50HB
Feature: 50 A amperage rating provides reliable overcurrent protection for automotive circuits up to 50 A. Business Impact: Reduces risk of wiring insulation damage and component failure, enabling higher uptime in critical vehicle systems. Application: Ideal for protecting power feeds to instrumentation, lighting, and accessory circuits in autos and fleets. Feature: Heavy-duty Type III classification enhances fault handling for harsh environments. Business Impact: Improves resistance to nuisance trips and supports longer service intervals. Application: Suitable for commercial vehicles, construction equipment, and off-road applications. Feature: #10-32 TPI stud connection delivers secure, low-resistance wiring. Business Impact: Simplifies installation and reduces connection losses over time. Application: Mounting in compact panels with robust bracket options. Feature: Compact footprint 0.55 in depth, 2.1 in height, 1.7 in width, weight 0.44 lb. Business Impact: Saves panel space and enables denser layouts without compromising performance. Application: Tight automotive control centers and modular electrical enclosures. Feature: RoHS compliant compliance supports modern automotive supply chains. Business Impact: Minimized regulatory risk and easier supplier audits. Application: Replacements and upgrades in RoHS-mandated environments. Feature: Lengthwise bracket and cover compatibility with quick-connect options lowers installation time. Business Impact: Reduces field labor and commissioning costs. Application: Service-friendly integration in assembly lines and repair shop settings. Feature: Pack quantity of six aids procurement and inventory planning. Business Impact: Improves ordering efficiency and reduces stockouts in maintenance programs. Application: Fleet service centers and parts depots.
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FAQs
BK/CB123-50HB uses a robust #10-32 TPI stud connection and is designed for use with lengthwise brackets and covers, plus quick-connect options. Its compact 0.55 in depth, 2.1 in height, and 1.7 in width enable mounting in tight automotive enclosures. For installation, align the stud connection to the panel, secure with appropriate fasteners, and connect the mating harness using the quick-connect terminals to ensure low-resistance, reliable contact.
The BK/CB123-50HB delivers a 50 A amperage rating, offering reliable overcurrent protection for automotive circuits. It is best applied to protect power feeds to accessories, instrumentation, and critical loads in heavy-duty vehicles, fleets, and equipment where space is at a premium and fast fault protection is essential.
Yes, BK/CB123-50HB is RoHS compliant, meaning it adheres to restrictions on hazardous substances in electrical components. This supports regulatory compliance, simplifies supplier audits, and aligns with modern automotive manufacturing standards for safer, more environmentally responsible products.
Official specifications and installation resources are available from Eaton. Key documents include the Eaton Specification Sheet for BK/CB123-50HB and the Bussmann series catalog PDFs, which cover catalog numbers, electrical ratings, dimensions, and mounting guidelines. Use these assets to validate compatibility and to plan panel integration during procurement and design reviews.
Prioritize features that reduce field labor and downtime: use the 10-32 stud connections for secure, low-resistance wiring, exploit bracket and cover compatibility for rapid assembly, and leverage the compact footprint to maximize space in crowded enclosures. These choices shorten commissioning time, ease future replacements, and lower maintenance costs in fleets and industrial automotive applications.