TL;DR
A breaker trip curve is the time-current characteristic graph showing how quickly a circuit breaker opens at each multiple of its rated current: slowly for mild overloads as the thermal element heats, and within milliseconds once current reaches the magnetic instantaneous range. Residential breakers follow one standard curve, but commercial and DC applications choose among designations like B, C, and D, which trip magnetically at roughly 3-5, 5-10, and 10-20 times rating.
What it means
A breaker trip curve is the time-current characteristic graph showing how quickly a circuit breaker opens at each multiple of its rated current: slowly for mild overloads as the thermal element heats, and within milliseconds once current reaches the magnetic instantaneous range. Residential breakers follow one standard curve, but commercial and DC applications choose among designations like B, C, and D, which trip magnetically at roughly 3-5, 5-10, and 10-20 times rating. Matching the curve to the load prevents nuisance trips from motor and compressor inrush without sacrificing fault protection. Electricians consult it when a properly sized breaker keeps tripping at equipment startup.
Where it sits in the glossary
Breaker trip curve is part of the Certifications group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
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