Eaton CB123-40HB automotive circuit breaker - 1.5kAIC
Part Number: CB123-40HB
Quick Summary
The Eaton CB123-40HB automotive circuit breaker protects 23 Vdc automotive circuits in harsh environments. Design engineers struggle to deliver reliable overload protection in compact, high-vibration installations. RoHS compliant with factory confirmation, this model follows Type III heavy-duty construction to withstand automotive shocks. For OEMs and service providers, its compact footprint and rugged connections help reduce wiring errors, downtime, and total cost of ownership. The CB123-40HB integrates easily with #10-32 stud terminals, supporting reliable installation in dashboards, engine compartments, and industrial controller panels. Industry professionals rely on its documented performance for safety and compliance in critical automotive systems.
Product Information
Extended Description
CB123-40HB Eaton: Eaton Bussmann series C.B.123-HB automotive circuit breaker, 23 Vdc, 40A, 1.5 kAIC at 12 Vdc, Type III, Heavy duty, 10-32 TPI stud
Product Name
Eaton Bussmann series CB123-HB automotive circuit breaker
Catalog Number
CB123-40HB
UPC
051712601672
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
40 A
Interrupt rating
1.5 kAIC at 12 Vdc
Voltage rating
23 Vdc
Connection
#10-32 TPI stud
Bussmann series 4-foot automotive planogram no.10730
Bussmann series full line retail catalog no. 5084
Bussmann series full line retail catalog no. 5084
Bussmann series full line retail catalog no. 5084
Bussmann series Fuseology
Eaton Specification Sheet - CB123-40HB
Feature: 40 A amperage rating, 23 Vdc, and 1.5 kAIC interrupt capacity at 12 Vdc. Business Impact: Protects wiring and sensitive loads from overcurrent while enabling fast fault clearance, reducing insulation damage and fire risk. Application: Ideal for main feeds and branch circuits in automotive electrical systems. Feature: #10-32 TPI stud connection. Business Impact: Delivers robust, low-resistance terminations that resist loosening under vibration, improving uptime. Application: Battery feeds and distribution points in engine bays and control panels. Feature: Compact footprint (0.55 in depth, 1.7 in width, 2.1 in height) and light 0.44 lb weight. Business Impact: Frees space in tight automotive enclosures and OEM panels, enabling easier routing and faster assembly. Application: Dashboards, fuse blocks, and compact controller housings. Feature: RoHS Compliant. Business Impact: Supports regulatory compliance in modern vehicle manufacturing and reduces hazardous substances in assemblies. Application: OEM production lines and retrofit programs. Feature: Type III heavy-duty construction. Business Impact: Delivers reliable performance in high-heat, vibration, and temperature swings common to automotive environments. Application: Heavy-duty vehicles, off-highway equipment, and industrial transport systems.
Get a Quick Quote for a Eaton CB123-40HB
Chat with us on WhatsApp - fast responses guaranteed
Need to speak with someone? We'll call you back within 2 hours during business hours
Interested in Eaton CB123-40HB?
Enquire Now
FAQs
CB123-40HB uses a robust #10-32 TPI stud connection. Its compact footprint (0.55 in depth, 1.7 in wide, 2.1 in high) and weight of 0.44 lb facilitate mounting in tight automotive panels and engine compartments, while providing secure, low-resistance terminations suitable for vibration-rich environments.
The breaker is rated for 40 A with a 23 Vdc voltage rating and an interrupt capacity of 1.5 kAIC at 12 Vdc. It is designed for Type III heavy-duty use, delivering reliable overcurrent protection in automotive circuits that demand quick fault clearance and robust protection.
Yes. CB123-40HB is engineered for automotive 23 Vdc systems with a 40 A rating and 1.5 kAIC interrupt capacity, and its RoHS-compliant construction supports both automotive OEMs and industrial equipment assembly. Its rugged, vibration-tolerant design makes it suitable for dashboards, control panels, and distribution points.
CB123-40HB is RoHS compliant per factory confirmation. This helps ensure your assemblies meet modern environmental and regulatory requirements, reducing compliance risk in new builds and retrofit programs while maintaining electrical performance and reliability.
With a Type III heavy-duty design and solid 40 A protection, the CB123-40HB reduces fault incidence in demanding environments, contributing to uptime and lower maintenance costs. Its durable stud connection and compact form factor also simplify inspection, replacement, and compatibility with existing automotive harnesses and fuse blocks.