Eaton BK/CB185-120 Automotive Circuit Breaker - 3 kAIC
Part Number: BK/CB185-120
Quick Summary
Eaton BK/CB185-120 automotive circuit breaker protects 48 Vdc automotive circuits in rugged environments. This compact protection device helps prevent wiring damage and equipment downtime by interrupting fault currents quickly. Engineers often struggle with moisture ingress and space constraints in tight enclosures, making reliability a top concern. RoHS compliant and built with waterproof, Type III switchable design, it withstands wet conditions and vibration common in automotive and fleet applications. By pairing robust electrical ratings with a space-efficient form and easy mounting, this breaker delivers long-term value for OEMs and service teams, improving uptime while simplifying maintenance and stock management in demanding environments.
Product Information
Extended Description
BK/CB185-120 Eaton: Eaton Bussmann series C.B.185 automotive circuit breaker, 48 Vdc, 120A, 3 kAIC, Type III, Switchable, Waterproof
Product Name
Eaton Bussmann series CB185 automotive circuit breaker
Catalog Number
BK/CB185-120
UPC
051712621595
Product Length/Depth
1.9 in
Product Height
2.9 in
Product Width
1.68 in
Product Weight
0.23 lb
Compliances
RoHS Compliant Contact factory
Amperage Rating
120 A
Interrupt rating
3 kAIC
Voltage rating
48 Vdc
Material
Waterproof
Packaging Type
Standard
Mounting Method
Flush
Quantity
6
Used with
SEMS nuts
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Eaton Specification Sheet - BK/CB185-120
120 A amperage rating with a 48 Vdc voltage rating provides reliable overcurrent protection for automotive circuits, reducing fuse replacements and limiting wiring damage in harnesses. The 3 kAIC interrupt rating enables the device to safely interrupt high fault currents, protecting sensitive electronics and enhancing system durability during short circuits in mobile equipment. The waterproof housing and Type III switchable design deliver dependable performance in wet environments and under vibration, lowering maintenance intervals and downtime for fleets, off-road vehicles, and industrial machines. Flush mounting with SEMS nuts supports clean, compact installations in restricted spaces, speeding assembly and reducing panel modification costs. RoHS compliance ensures regulatory alignment and easier supplier audits, while standard packaging of six units per kit simplifies stocking and replenishment for maintenance teams. Overall, the BK/CB185-120 strengthens protection strategies without complicating installation or lifecycle management.
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FAQs
BK/CB185-120 is designed for flush mounting and is compatible with SEMS nuts, enabling a clean, space-efficient fit in tight automotive panels. It comes in standard packaging of six units per kit, which simplifies stock management and recovery after service intervals. This mounting approach reduces wiring complexity while maintaining secure, vibration-resistant connections in demanding environments.
The BK/CB185-120 provides a 48 Vdc voltage rating and a 120 A amperage rating, paired with a 3 kAIC interrupt rating. These specifications indicate strong protection for automotive circuits against overcurrent and short-circuit events, helping shield downstream electronics and reduce in-vehicle downtime. The unit is RoHS compliant and constructed as waterproof, Type III switchable hardware for reliability in harsh conditions.
Yes. The BK/CB185-120 is described as waterproof, supporting protection in wet or humid automotive environments. Its Type III switchable design further enhances reliability under vibration and moisture exposure. For best results, install with flush mounting and SEMS nuts to maintain a tight seal and reduce ingress risk in damp vehicle compartments.
The product is RoHS compliant, aligning with key environmental and regulatory requirements. The data does not list other certifications, so for any additional regulatory needs beyond RoHS, refer to Eaton’s specification sheets or contact the manufacturer to confirm CE, UL, or other approvals for your region and application.
Using the BK/CB185-120 reduces downtime by providing reliable, high-current protection with fast interruption (3 kAIC) and protection against moisture-related failures (waterproof design). Its compact, flush-mount form and SEMS-nut compatibility simplify installation, while RoHS compliance eases supplier audits. Pack size of six units supports efficient stocking and rapid replacement in service fleets, contributing to lower maintenance costs over the lifecycle.