Eaton CB185-120 automotive circuit breaker - 3 kAIC
Part Number: CB185-120
Quick Summary
CB185-120 automotive circuit breaker from Eaton protects 48 V automotive circuits in rugged vehicle electrical systems. Engineers often confront moisture ingress and vibration-induced nuisance trips, which can lead to reliability gaps and costly downtime. This unit delivers a robust combination of 3 kAIC interrupt rating, 120 A rating, and waterproof, Type III switchable protection. With flush mounting and a compact footprint, it simplifies harness design for OEMs while enabling quick field servicing; RoHS compliant to support sustainable manufacturing practices. For teams targeting durable protection in harsh environments, the CB185-120 offers reliable electrical protection and long-term cost efficiency. This combination supports automotive OEMs seeking proven protection across vehicle platforms.
Product Information
Extended Description
CB185-120 Eaton: Eaton Bussmann series C.B.185 automotive circuit breaker, Switchable, 48 Vdc, 120A, 3 kAIC, Type III, High amp, Waterproof
Product Name
Eaton Bussmann series CB185 automotive circuit breaker
Catalog Number
CB185-120
UPC
051712596428
Product Length/Depth
1.9 in
Product Height
2.9 in
Product Width
1.68 in
Product Weight
0.23 lb
Compliances
Contact factory RoHS Compliant
Amperage Rating
120 A
Interrupt rating
3 kAIC
Voltage rating
48 Vdc
Material
Waterproof
Packaging Type
Standard
Mounting Method
Flush
Special features
Switchable
Bussmann series 4-foot automotive planogram no.10730
CB185-120~TYPE 3 - SWITCHABLE W.P. CB - 120 AMP
CB185-120~TYPE 3 - SWITCHABLE W.P. CB - 120 AMP
Bussmann series Fuseology
Eaton Specification Sheet - CB185-120
Feature: 120 A amperage rating paired with a 48 Vdc operating voltage. Business Impact: Protects high-current automotive circuits without nuisance trips, enabling reliable operation of critical loads and reducing fuse-related downtime. Application: Suitable for 48 V automotive architectures in trucks, buses, and rugged vehicles. Long-tail keywords integrated: 48 V automotive protection, high-current automotive circuit protection, 120 A automotive breaker. Benefit: Strengthens system reliability and lowers maintenance costs by preventing unexpected outages. Feature: 3 kAIC interrupt rating for fault current. Business Impact: Faster fault clearance minimizes electrical arcing damage and wiring insulation wear, resulting in longer harness life. Application: Ideal for concentrated fault zones in engine bays and power distribution modules. Long-tail keywords: high interrupt rating circuit breakers, fault current protection, automotive overload protection. Benefit: Reduced risk of collateral damage and service interruptions. Feature: Waterproof, switchable Type III design. Business Impact: Enables safe reset and reusability in wet environments and during maintenance, increasing uptime in off-road or marine-adjacent applications. Application: Offshore, agricultural, and rugged off-highway equipment. Long-tail keywords: waterproof automotive breaker, switchable circuit breaker, Type III protection. Benefit: Improves field serviceability and lifecycle cost. Feature: Flush mounting with standard packaging. Business Impact: Saves space in compact dashboards and simplifies integration with standard panels, accelerating OEM assembly. Application: OEM instrument panels and compact enclosures. Long-tail keywords: flush-mount circuit breaker, compact protection device, standard packaging. Benefit: Space-efficient protection that speeds install and reduces panel depth. Feature: RoHS compliant and Bussmann series compatibility. Business Impact: Supports regulatory compliance and streamlined sourcing for mixed-component panels. Application: Electronics and electrical protection assemblies in compliant manufacturing. Long-tail keywords: RoHS compliant circuit breaker, Bussmann automotive protection, compliant assembly. Benefit: Lower risk of regulatory non-compliance and supply-chain complexity.
Get a Quick Quote for a Eaton CB185-120
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 CB185-120?
Enquire Now
FAQs
For optimal performance, Mount CB185-120 using flush mounting in standard automotive panels. Ensure cutouts align with the device dimensions (1.9 in depth, 2.9 in height, 1.68 in width) and follow Eaton’s datasheet guidance for panel tolerance, wiring clearances, and secure fasteners. The unit ships in standard packaging and is designed for straightforward field replacement, reducing service time during maintenance.
CB185-120 provides 120 A amperage rating at 48 Vdc with a 3 kAIC interrupt rating, enabling rapid fault clearance and protecting wiring from overloads. It is switchable and Type III, with waterproof construction suitable for harsh environments. These specs support reliable protection for high-current automotive circuits while meeting basic rugged-use requirements.
Yes. The CB185-120 is designed for rugged automotive applications and features waterproof construction suitable for off-road, marine, and other harsh-environment equipment. Its 48 Vdc rating aligns with common vehicle electrical systems, while the 3 kAIC interrupt rating provides robust fault protection in dynamic operating conditions typical of these sectors.
CB185-120 supports RoHS compliance, indicating restriction of hazardous substances in the product. For exact certification scope, contact the factory to confirm additional regulatory alignments. The device is part of Eaton’s Bussmann automotive protection family and is designed to integrate with standard automotive harnesses while meeting applicable environmental requirements.
The CB185-120 reduces downtime by providing reliable 120 A protection with a high 3 kAIC interrupt rating, which minimizes damage from short circuits. Its waterproof, switchable design and flush-mount form factor simplify installation and servicing, lowering labor costs and spare parts usage. RoHS compliance further supports long-term maintenance and supplier diversification benefits.