Eaton CB185-40 automotive circuit breaker - Waterproof
Part Number: CB185-40
Quick Summary
CB185-40 automotive circuit breaker from Eaton provides reliable overcurrent protection for 48 Vdc automotive electrical systems. This switchable, high-amp device helps prevent wiring damage and unplanned downtime in commercial vehicles, heavy equipment, and off-road applications. For engineers, the challenge often lies in rugged environments where moisture, vibration, and high surge currents threaten protection reliability; this unit’s waterproof construction and robust 470A rating address those needs. RoHS compliant and designed for Type III automotive circuits, it supports durable field service while reducing maintenance costs. By aligning with flush-mount panels and standard wiring practices, it also delivers straightforward installation and predictable lifecycle value for procurement and maintenance teams.
Product Information
Extended Description
CB185-40 Eaton: Eaton Bussmann series C.B.185 automotive circuit breaker, Switchable, 48 Vdc, 470A, 3 kAIC, Type III, High amp, Waterproof
Product Name
Eaton Bussmann series CB185 automotive circuit breaker
Catalog Number
CB185-40
UPC
051712501415
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
470A
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
CB185-40~TYPE 3 - SWITCHABLE W.P. CB - 40 AMP
CB185-40~TYPE 3 - SWITCHABLE W.P. CB - 40 AMP
Bussmann series Fuseology
Eaton Specification Sheet - CB185-40
Feature: 470A amperage rating provides robust protection for high-current automotive circuits. Business Impact: prevents wiring insulation damage and costly electrical failures under peak loads. Application: ideal for heavy-duty vehicle power distribution and performance-critical assemblies in fleets. Feature: 3 kAIC interrupt rating enables rapid fault isolation. Business Impact: minimizes damage propagation and downtime after a short circuit. Application: essential in harnesses and junction blocks in commercial vehicles. Feature: 48 Vdc operation supports modern automotive architectures. Business Impact: compatibility with electrified powertrains and accessories reduces redesign needs. Application: suitable for 48 VDC system protection in hybrids and light industrial equipment. Feature: Waterproof construction enhances reliability in outdoor and under-hood environments. Business Impact: sustained protection in wet or humid conditions lowers maintenance costs. Application: marine, off-road, and outdoor vehicle installations. Feature: Type III, switchable design allows easy reset and servicing. Business Impact: lowers maintenance time and facilitates field testing without replacing fuses. Application: serviceable protection in modular automotive panels. Feature: Flush mounting and compact footprint simplify integration. Business Impact: minimizes panel depth and aids standardization across control enclosures. Application: tight chassis spaces in dashboards and electrical centers. Feature: Lightweight, compact dimensions support multi-circuit layouts. Business Impact: reduces overall enclosure weight and improves reliability through space optimization. Application: multi-point protection in compact automotive control hubs.
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FAQs
CB185-40 is designed for flush mounting in standard automotive panels. Ensure 48 Vdc supply wiring is appropriately gauge-rated for 470A, with secure terminal connections to minimize resistance and heat. The unit’s compact footprint (1.9 in L, 1.68 in W) helps fit in crowded harness layouts, while the waterproof construction supports under-hood exposure.
CB185-40 provides a 470A amperage rating and a 3 kAIC interrupt rating, enabling rapid fault isolation and protection against severe surge events. This combination helps prevent insulation damage and reduces the risk of cascading failures in heavy-duty automotive circuits and power distribution blocks.
Yes. The CB185-40 features waterproof construction designed for rugged automotive environments, including under-hood and exposed installations. It is RoHS compliant, aligning with modern environmental and materials standards for durable field use in fleets, off-road equipment, and outdoor power centers.
The datasheet confirms RoHS compliance from the manufacturer. While CE and IP ratings are not listed in the provided data, RoHS compliance indicates material safety compliance, and Eaton can verify additional certifications upon request for specific regional or application requirements.
The CB185-40’s high current rating, rugged weatherproof design, and switchable reset feature reduce fuse replacements and downtime in critical automotive circuits. Its compatibility with flush mounting simplifies installation and diagnostics, leading to lower maintenance labor costs and improved vehicle uptime over the lifecycle of fleets and equipment.