This SAE Standard defines the test conditions, procedures, and performance requirements for circuit breakers in ratings up to and including 50 A. The document includes automatic reset, modified reset, and manually reset types of circuit breakers for 12 V and 24 V DC electrical systems. Some circuit breakers may have dual voltage ratings (AC and DC), however, this document evaluates DC performance only.

Operational requirements for 42V vehicular electrical systems are under development as of this revision. The electrical environment is not completely defined, particularly as it relates to other components that would influence circuit breaker function (such as storage battery technology, charging system design and operational characteristics). The test and evaluation requirements of this standard are sufficient to determine relative performance concerning current carrying capability, environmental durability, and general requirements regardless of maximum voltage rating. It is anticipated that a separate technical document will be created to capture requirements unique to 42V electrical system architecture and load characteristics.

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