Eaton BK/CB181F-120 Automotive Circuit Breaker - Waterproof
Part Number: BK/CB181F-120
Quick Summary
The Eaton BK/CB181F-120 automotive circuit breaker provides reliable overcurrent protection for vehicle electrical systems. This compact device is designed to cut power during faults while staying protected in wet, exposed environments. Engineers often struggle with waterproofing protection devices without complicating maintenance, but the Type I waterproof enclosure of this unit reduces corrosion risk and service interruptions. RoHS compliance reinforces regulatory alignment, while flush mounting and SEMS-nut compatibility streamline installation in tight control boxes. For fleets and OEM assemblies, this combination translates into lower downtime, improved safety, and predictable electrical behavior, supporting long-term reliability in harsh automotive and off-road applications.
Product Information
Extended Description
BK/CB181F-120 Eaton: Eaton Bussmann series C.B.181F automotive circuit breaker, 120A, Type I, Waterproof
Product Name
Eaton Bussmann series CB181F automotive circuit breaker
Catalog Number
BK/CB181F-120
UPC
051712846974
Product Length/Depth
1.3 in
Product Height
0.76 in
Product Width
0.22 in
Product Weight
0.5 lb
Compliances
Contact factory RoHS Compliant
Certifications
Contact Manufacturer
Amperage Rating
120 A
Material
Waterproof
Packaging Type
Standard
Mounting Method
Flush
Quantity
6
Used with
SEMS nuts
Bussmann series 4-foot automotive planogram no.10730
BK/CB181F-120~BK-CB181F-120~FLUSH MOUNT CIRCUIT MOUNT
BK/CB181F-120~BK-CB181F-120~FLUSH MOUNT CIRCUIT MOUNT
Bussmann series Fuseology
Eaton Specification Sheet - BK/CB181F-120
Feature: Waterproof Type I enclosure and 120 A rating → Business Impact: Protects circuits in wet environments while delivering robust overcurrent protection, reducing corrosion and field failures → Application: Automotive, marine, and off-road electrical systems. Feature: Compact dimensions (1.3 in L × 0.76 in H × 0.22 in W) → Business Impact: Enables dense panel layouts and easier retrofits without sacrificing protection → Application: Space-constrained control boxes in vehicles. Feature: Flush mounting → Business Impact: Simplifies installation, minimizes panel intrusion, and improves thermal performance → Application: OEM assemblies and shielded dashboard enclosures. Feature: SEMS-nut compatibility → Business Impact: Streamlines service and maintenance with standard fasteners, shortening downtime → Application: Field replacements and service workshops. Feature: RoHS compliant → Business Impact: Aligns with regulatory requirements and green manufacturing goals → Application: Automotive and industrial supply chains seeking compliance. Feature: Packaging of 6 per pack → Business Impact: Stocking efficiency for fleets and production lines, reducing procurement costs → Application: OEM procurement and service depots.
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FAQs
The BK/CB181F-120 is designed for flush mounting in automotive panels, which helps maintain a low-profile inside the enclosure. It is compatible with SEMS nuts, simplifying fastener selection and installation on standard automotive hardware. This mounting approach reduces panel intrusion and improves thermal performance by allowing closer placement to other components. Proper torque and secure seating minimize arcing and vibration-related wear.
It provides a 120 A amperage rating, with overall size 1.3 in L × 0.76 in H × 0.22 in W and weight around 0.5 lb. Packaging is standard, with six units per pack. These specs enable easy drop-in replacement in compact automotive control boxes while maintaining robust overcurrent protection.
Yes, the product is RoHS compliant, aligning with regulatory expectations for modern automotive components. Certifications beyond RoHS are not listed publicly by Eaton; for complete certification details, contact the manufacturer. The device is described as Type I waterproof and intended for rugged use in automotive and marine contexts, contributing to long-term reliability.
Applications include automotive electrical protection, off-road and marine vehicle systems, and other environments where moisture and vibration challenge circuit protection. The flush-mount design and waterproof housing simplify installation in tight control panels, while 6-per-pack stocking supports maintenance operations and OEM production lines.
To maximize reliability, ensure flush mounting with properly torqued fasteners and use of SEMS nuts where specified. The waterproof Type I construction minimizes water ingress in wet environments, reducing corrosion risk. RoHS compliance aids regulatory alignment, while regular inspection of terminals and ease of replacement shorten downtime and lower total cost of ownership.