Eaton CBC-40B Automotive Circuit Breaker - 1.5 kAIC
Part Number: CBC-40B
Quick Summary
The Eaton CBC-40B Automotive Circuit Breaker protects automotive electrical systems by interrupting faults up to 1.5 kAIC in 14 Vdc circuits. In real-world vehicle environments, sudden short circuits and overloads can cause downtime and wiring damage, so reliable protection is essential. While explicit certifications vary by region, compliance is typically confirmed with the factory for CE, IP, and regional conformance as required. As part of the Bussmann CBC-B family, this device standardizes automotive protection and supports straightforward replacement in service fleets, delivering strong protection for battery lines and critical loads while aligning with common automotive power-distribution practices.
Product Information
Extended Description
CBC-40B Eaton: Eaton Bussmann series CBC-B automotive circuit breaker, 14 Vdc, 40 A, 1.5 kAIC, Type I, 10-32 TPI stud
Product Name
Eaton Bussmann series CBC-B automotive circuit breaker
Catalog Number
CBC-40B
UPC
051712271233
Product Length/Depth
14.75 in
Product Height
7.5 in
Product Width
9.25 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
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Eaton Specification Sheet - CBC-40B
Feature: 14 Vdc, 40 A, 1.5 kAIC electrical rating. Business Impact: Protects automotive circuits from overload and short-circuit events, reducing downtime and wiring damage. Application: Ideal for vehicle electrical systems, battery feeds, and accessory power distribution with reliable fault interruption. Feature: #10-32 TPI stud connection. Business Impact: Simplifies installation and ensures a robust mechanical and electrical connection, enabling quick replacement in service bays. Application: Fits standard automotive stud terminals, streamlining retrofits and maintenance. Feature: Large, defined footprint (14.75 in L x 9.25 in W x 7.5 in H) and 0.5 lb weight. Business Impact: Predictable mounting envelope and lightweight handling simplify enclosure planning and fleet rollouts. Application: Dash, trunk, or engine-compartment deployments where space is planned. Feature: Type I designation within CBC-B family. Business Impact: Consistent performance characteristics across CBC-B devices simplifies parts inventory and training. Application: Fleet maintenance and spare-part planning for automotive protection schemes. Feature: UPC and cataloging readiness (UPC 051712271233, broad catalog availability). Business Impact: Improves procurement efficiency and reduces sourcing time for automotive protection components. Application: Retail and distributor channels supporting automotive electrical protection upgrades.
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FAQs
To install CBC-40B, disconnect power and ensure the 14 Vdc system is de-energized. Connect the load and supply through the #10-32 TPI stud terminals, secure the connection with appropriate hardware, and verify polarity. The CBC-40B is designed for straightforward replacement in standard automotive harnesses; consult the Eaton spec sheet for any regional mounting considerations.
CBC-40B provides 14 Vdc operation with a 40 A current rating and an interrupt rating of 1.5 kAIC. It uses a Type I configuration and features a #10-32 TPI stud connection, making it suitable for automotive power distribution while protecting loads from overcurrent events.
CBC-40B can protect automotive DC circuits, including battery feeds and accessory lines. However, motor starting surges and inductive loads may require evaluation of the interrupt rating and load profile. For high inrush motors, verify that 1.5 kAIC and 14 Vdc operation align with the specific motor requiring protection. Consider a protective device revision if starting currents exceed the rating.
Explicit certifications are not listed in the provided data; compliances vary by region. It is recommended to contact Eaton to confirm CE, IP ratings, SIL considerations, and regional conformance for your installation site before deployment in regulated environments.
Using the CBC-40B reduces fuse replacements and wiring damage by providing reliable overcurrent protection, which lowers downtime and maintenance costs. Its standardized 14 Vdc, 40 A, 1.5 kAIC ratings simplify stocking and repairs across fleets, yielding faster service and improved uptime for automotive electrical systems.