Eaton CB123-50B Automotive Circuit Breaker - 1.5 kAIC at 12 Vdc
Part Number: CB123-50B
Quick Summary
Eaton CB123-50B automotive circuit breaker protects 24 VDC circuits from overloads. In mobile equipment, protection must endure vibration and temperature swings without nuisance trips. RoHS compliant; for additional certifications such as CE and IP ratings, contact factory. This device delivers 1.5 kAIC at 12 Vdc with Type III, heavy-duty construction, while offering compact integration for modern automotive harnesses. The combination of rugged protection and reliable performance supportsOEMs and fleets seeking lower downtime and longer service life.
Product Information
Extended Description
CB123-50B Eaton: Eaton Bussmann series C.B.123-B automotive circuit breaker, 24 Vdc, 50A, 1.5 kAIC at 12 Vdc, Type III, Heavy duty, 10-32 TPI stud
Product Name
Eaton Bussmann series CB123-B automotive circuit breaker
Catalog Number
CB123-50B
UPC
051712601740
Product Length/Depth
0.58 in
Product Height
1.35 in
Product Width
1.8 in
Product Weight
0.54 lb
Compliances
Contact factory RoHS Compliant
Amperage Rating
50 A
Interrupt rating
1.5 kAIC at 12 Vdc
Voltage rating
24 V DC
Connection
#10-32 TPI stud
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Eaton Specification Sheet - CB123-50B
Feature → Business Impact → Application: The CB123-50B provides a 24 V DC, 50 A amperage rating with a 1.5 kAIC interrupt capability at 12 VDC, enabling fast, reliable fault isolation in automotive circuits. This reduces unplanned downtime and protects critical loads in fleet vehicles and construction equipment. Application: ideal for 24 VDC automotive power rails and heavy-duty subsystems where rapid response to overcurrent is essential. Long-term benefit includes reduced warranty claims and improved field service efficiency. Feature → Business Impact → Application: Type III, heavy-duty construction delivers robust performance under vibration, thermal cycling, and harsh environmental conditions. Impact: higher uptime and fewer nuisance trips during peak load events. Application: perfect for off-road machinery, EV charging modules, and commercial vehicles operating in demanding environments. Feature → Business Impact → Application: #10-32 TPI stud connections provide secure, vibration-resistant electrical interfaces with common automotive harnesses. Impact: faster installation, easier maintenance, and compatibility with existing wiring harness standards. Application: panel-mounted or inline protection in relay panels and fuse blocks across automotive and industrial equipment. Feature → Business Impact → Application: RoHS compliance supports regulatory alignment and cross-border manufacturing. Impact: smoother IPC and supplier onboarding, reducing compliance risk and time-to-market. Application: OEMs building global vehicle platforms needing clean-supply chain integration. Feature → Business Impact → Application: Compact dimensions (0.58 in depth, 1.8 in width, 1.35 in height) and 0.54 lb weight enable space-saving installation. Impact: enables tighter packaging and easier retrofits in crowded control enclosures. Application: compact protection modules in dashboards, engine bays, and protected vehicle enclosures. Feature → Business Impact → Application: 24 VDC, 50 A rating with 1.5 kAIC at 12 Vdc delivers precise protection curves for critical loads. Impact: predictable trip behavior, improved system reliability, and easier design validation. Application: electrical protection for essential vehicular subsystems, battery management, and auxiliary circuits.
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FAQs
CB123-50B uses #10-32 TPI stud connections, simplifying wiring harness integration and enabling secure, vibration‑resistant mounting. Its compact footprint (0.58 in depth, 1.8 in width) fits tight automotive enclosures, while still offering robust mechanical integrity. For panel or inline protection, ensure stud terminations are torqued to the vehicle’s recommended specification to maintain reliable contact during operation.
The CB123-50B is rated for 24 V DC systems with a 50 A continuous current rating and an interrupt capability of 1.5 kAIC at 12 VDC. It features Type III, heavy‑duty operation designed for automotive use. These specs enable fast, predictable fault interruption while tolerating the vibration and thermal cycling typical of mobile equipment.
Yes. Designed for 24 VDC automotive circuits with a robust Type III construction, CB123-50B provides reliable protection for critical loads in fleets, construction equipment, and mobile machinery. Its 50 A rating and 1.5 kAIC interrupt capability support protection of power rails, battery feeds, and auxiliary circuits, while its compact size eases integration in crowded control bays.
CB123-50B is RoHS compliant, supporting regulatory standards for material restrictions and sustainability. For additional certifications such as CE or IP ratings, please contact Eaton or your distributor since those approvals may vary by lot or application. This ensures you meet regional requirements for automotive and industrial deployments.
The CB123-50B’s rugged Type III design, reliable trip performance, and compact form factor contribute to reduced field failures and maintenance costs. Its secure #10-32 connections reduce contact resistance drift over time, supporting longer service intervals and lower lifecycle costs for OEMs and service fleets through fewer warranty claims and less unscheduled downtime.