Eaton BK/CB185-150 Automotive Circuit Breaker - 3 kAIC
Part Number: BK/CB185-150
Quick Summary
The Eaton BK/CB185-150 automotive circuit breaker protects 48 VDC circuits with precise overcurrent protection. Engineers often struggle with water exposure, unreliable trips, and difficult maintenance in harsh automotive environments. RoHS compliant with a rugged waterproof housing and a Type III switchable mechanism supports dependable field service. Its 150 A rating, 3 kAIC interrupt capability, and 6-pack packaging provide scalable protection for fleets and off-road equipment while remaining compatible with SEMS-nut mounting and Bussmann planograms. This combination helps procurement reduce warranty costs and simplify sourcing across multiple vehicle platforms.
Product Information
Extended Description
BK/CB185-150 Eaton: Eaton Bussmann series C.B.185 automotive circuit breaker, 48 Vdc, 150A, 3 kAIC, Type III, Switchable, Waterproof
Product Name
Eaton Bussmann series CB185 automotive circuit breaker
Catalog Number
BK/CB185-150
UPC
051712621618
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
150 A
Interrupt rating
3 kAIC
Voltage rating
48 Vdc
Material
Waterproof
Packaging Type
Standard
Mounting Method
Flush
Quantity
6
Used with
SEMS nuts
Bussmann series 4-foot automotive planogram no.10730
Bussmann series complete full line catalog no. 1007
Bussmann series complete full line catalog no. 1007
Bussmann series Fuseology
Eaton Specification Sheet - BK/CB185-150
48 Vdc operation with a 150 A amperage rating and a 3 kAIC interrupt capability delivers solid overcurrent protection for high-load automotive circuits. This translates to fewer nuisance trips and minimized risk of damage to wiring harnesses, connectors, and sensitive electronics. In practice, the BK/CB185-150 protects critical power rails in fleets and off-road systems, allowing longer service intervals and more predictable maintenance cycles. Waterproof housing and a Type III switchable design address environmental risk in exposed installations. The rugged enclosure reduces corrosion and ingress, lowering failure rates in wet or dusty under-hood environments, enabling technicians to rely on consistent trip performance in extreme temperatures or humidity. Flush mounting with SEMS-nut compatibility simplifies installation, fits standard automotive enclosures and planograms, and supports bulk stocking with six units per package for rapid retrofit and OEM integration. RoHS compliance and Bussmann series lineage reduce compliance risk and enable scalable protection strategies across vehicle architectures. The compact form factor (1.9 in x 1.68 in x 2.9 in; 0.23 lb) helps optimize harness layouts and reduce overall system weight.
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FAQs
The BK/CB185-150 uses flush mounting and is designed for SEMS-nut mounting, matching standard automotive panel cutouts. It ships in standard packaging (six units) to streamline stocking and field installation. During installation, ensure proper panel prep and secure mounting to maintain waterproof integrity and reliable contact and trip performance in vibration-prone environments.
This breaker provides 150 A amperage rating with a 3 kAIC interrupt rating at a 48 Vdc nominal voltage. It is intended to protect high-current automotive circuits, such as power distribution lines in fleets and heavy equipment. Verify conductor size and enclosure clearance to ensure safe operation and full protection under fault conditions.
Yes. The device features a waterproof housing and RoHS compliance, designed to withstand moisture and contaminants common in automotive under-hood and exterior environments. While not listing a formal IP rating here, the waterproof construction and Type III switchable mechanism provide reliable protection and serviceability in demanding conditions.
Official Eaton references include the Bussmann series specification sheet for BK/CB185-150 and the Bussmann catalog no. 1007, both accessible through Eaton’s documentation repository. Planograms and plan-view materials are available in the product downloads, including the automotive planogram no. 10730 for reference during shelf and enclosure planning.
The 150 A/3 kAIC rating coupled with robust waterproofing reduces nuisance trips and wiring damage, lowering repair costs and downtime. For fleets and field equipment, the ease of installation (flush mounting, SEMS-nuts) and standard packaging streamline stocking and replacements, improving uptime and reducing total cost of ownership over multi-vehicle programs.