Eaton CB185-135 Automotive Circuit Breaker - Waterproof
Part Number: CB185-135
Quick Summary
The CB185-135 automotive circuit breaker provides reliable protection for 48 Vdc automotive circuits in harsh vehicle environments. In demanding applications, unplanned downtime and component damage can erode uptime and increase maintenance costs. RoHS compliant and built with a waterproof, switchable design, this unit supports flush mounting for clean panel integration and rapid field servicing. Its 135 A rating and 3 kAIC interrupt capacity deliver robust protection against short circuits, while the compact 1.9 in depth helps simplify panel layouts. By aligning with Eaton Bussmann series components, you gain consistent performance, easier sourcing, and predictable lifecycle costs for fleet, off-road, and industrial automotive applications.
Product Information
Extended Description
CB185-135 Eaton: Eaton Bussmann series C.B.185 automotive circuit breaker, Switchable, 48 Vdc, 135A, 3 kAIC, Type III, High amp, Waterproof
Product Name
Eaton Bussmann series CB185 automotive circuit breaker
Catalog Number
CB185-135
UPC
051712621533
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
135A
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
CB185-135~TYPE 3 - SWITCHABLE W.P. CB - 135 AMP
CB185-135~TYPE 3 - SWITCHABLE W.P. CB - 135 AMP
Bussmann series Fuseology
Eaton Specification Sheet - CB185-135
Feature → Business Impact → Application: The CB185-135 is rated for 48 Vdc and 135 A, delivering substantial protection for mid- to high-load automotive circuits; this reduces the risk of electrical damage during faults and minimizes downtime in critical systems such as propulsion and auxiliary power. Application: Suitable for automotive, heavy equipment, and fleet electrical protection where reliable interruption is required to prevent cascading failures. Feature → Business Impact → Application: With a 3 kAIC interrupt rating, the device clears faults quickly, reducing arc energy and protecting downstream wiring and components; this translates to longer harness life and lower repair costs in harsh operating conditions. Application: Ideal for rugged off-road, industrial vehicles, and marine applications.
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FAQs
The CB185-135 is designed for flush mounting, simplifying integration into panel cutouts. Ensure the panel provides a clean flush surface to minimize exposure to contaminants, and verify the mounting space accommodates the 1.9 inch depth and 1.68 inch width. Use standard fasteners per OEM guidelines and confirm 48 Vdc wiring polarity before energizing. This approach helps maintain panel aesthetics while delivering reliable protection.
Key ratings include 135 A continuous amperage, 3 kAIC interrupt rating, and a 48 Vdc operating voltage. The 3 kAIC rating indicates the device can interrupt fault currents up to 3 kiloamps, minimizing arc energy and wiring damage during short circuits. The 135 A rating supports heavy automotive loads, while 48 Vdc aligns with many modern vehicle electrical systems.
Yes. The CB185-135’s waterproof construction and flush-mount design make it well-suited for harsh environments typical of off-road vehicles, marine systems, and rugged industrial equipment. Its compact footprint, combined with Eaton Bussmann series compatibility, simplifies replacement in aftermarket installations and OEM panels while maintaining reliable circuit protection.
The product is RoHS compliant, supporting restricted substance requirements for safer environmental performance. Eaton provides additional documentation and datasheets for broader standards; for other certifications like CE or IP ratings, please consult the official Eaton catalog or contact factory for confirmation on your regional requirements.
The switchable feature enables quick testing without full replacement, reducing downtime during maintenance. Its rugged waterproof design improves reliability in outdoor and wet installations, lowering failure-related maintenance costs. RoHS compliance and standard packaging also streamline procurement and spare parts planning, contributing to lower total cost of ownership over the vehicle or equipment lifecycle.