Eaton BK/CBC-40B Automotive Circuit Breaker - 1.5 kAIC
Part Number: BK/CBC-40B
Quick Summary
The Eaton BK/CBC-40B automotive circuit breaker protects vehicle electrical circuits against overloads. In demanding vehicle and off-road environments, nuisance trips can drive downtime and maintenance costs. While verification of certifications should be confirmed with the factory, the CBC-B family delivers 14 Vdc operation, a 40 A rating, and a 1.5 kAIC interrupt capacity for robust protection. The device uses a #10-32 TPI stud for secure connections and a compact footprint suitable for tight electrical bays. This combination helps fleets and OEMs improve uptime, simplify spare parts inventories, and maintain reliable power distribution across harsh operating conditions.
Product Information
Extended Description
BK/CBC-40B Eaton: Eaton Bussmann series CBC-B automotive circuit breaker, Packaging quantity 100, 14 Vdc, 40 A, 1.5 kAIC, Type I, Heavy duty, 10-32 TPI stud
Product Name
Eaton Bussmann series CBC-B automotive circuit breaker
Catalog Number
BK/CBC-40B
UPC
051712556521
Product Length/Depth
0.84 in
Product Height
1.35 in
Product Width
1.46 in
Product Weight
0.5 lb
Compliances
Contact factory
Amperage Rating
40 A
Interrupt rating
1.5 kAIC
Voltage rating
14 Vdc
Connection
#10-32 TPI stud
Quantity
6
Special features
Packaging quantity 100
Bussmann series 4-foot automotive planogram no.10730
BK/CBC-40B~BK-CBC-40B~CIRCUIT BREAKER
BK/CBC-40B~BK-CBC-40B~CIRCUIT BREAKER
Bussmann series Fuseology
Eaton Specification Sheet - BK/CBC-40B
Feature: 14 Vdc operation and a 40 A current rating. Business impact: protects automotive circuits from overloads during normal and peak loads, reducing fuse replacements and electrical damage. Application: ideal for 12–14 V automotive power distribution in cars, trucks, fleet equipment. Feature: 1.5 kAIC interrupt rating. Business impact: provides robust fault-current clearance, preventing insulation damage and wire harness welding during high-current faults. Application: effective in engine compartments and main supply lines where surge currents can be high. Feature: Type I heavy-duty design. Business impact: durable operation under vibration, temperature variation, and rough handling common in mobile equipment. Application: drives reliability in commercial vehicles, construction machinery, and emergency services fleets. Feature: #10-32 TPI stud connection. Business impact: simplifies mounting and electrical connection using standard hardware; reduces installation time and torque-related issues. Application: panel mounting and harness integration with existing connector schemes. Feature: Compact dimensions and light weight. Business impact: saves panel space and enables tighter layouts, boosting system density and reducing overall weight. Application: ideal for crowded electrical enclosures in compact vehicles and equipment. Feature: Packaging quantity 100 and CBC-B family compatibility. Business impact: supports stocking and kit-building strategies, lowering procurement costs and simplifying maintenance spares. Application: works with Bussmann CBC-B automotive protection lineup for modular protection schemes.
Get a Quick Quote for a Eaton BK/CBC-40B
Chat with us on WhatsApp - fast responses guaranteed
Need to speak with someone? We'll call you back within 2 hours during business hours
Interested in Eaton BK/CBC-40B?
Enquire Now
FAQs
The BK/CBC-40B uses a #10-32 TPI stud connection and fits standard automotive harness assemblies. Mount the breaker on a panel or chassis using appropriate hardware, ensure proper torque on the stud, and keep connections clean to maintain secure contact and service life. Its compact depth supports tight enclosures common in vehicles.
A 1.5 kAIC interrupt rating means the breaker can safely interrupt high fault currents typical in automotive power systems, protecting wires and insulation from damage and preventing cascading failures. This rating supports coordinated protection with other protectors and reduces the risk of nuisance trips during engine start-ups or surge events.
Yes. The CBC-B family is designed for heavy-duty automotive use and耐 vibration, with a robust Type I mechanism and a compact, sturdy stud connection. This makes it well-suited for trucks, buses, off-road equipment, and other mobile applications where vibration and temperature changes are routine.
The specification notes Compliances: Contact factory, so confirm CE, IP ratings, and SIL suitability directly with Eaton. For regulated environments, request current compliance documentation and ensure installation practices meet regional automotive electronics standards and your customer’s certification requirements.
Stocking CBC-B breakers supports faster field service and reduces unplanned downtime by protecting critical circuits. With 100-pack packaging and 14 Vdc, 40 A protection, the device aligns with common fleet electrical designs, delivering lower total cost of ownership through improved reliability and simplified spare parts management.