TL;DR
The main breaker is the large two-pole circuit breaker at the top of a panel that disconnects all branch circuits at once and limits the total current the panel can draw, commonly 100, 150, or 200 amps in homes. Its rating, stamped on the handle, is the number electricians start from when calculating capacity for additions like EV charging or electrification projects.
What it means
The main breaker is the large two-pole circuit breaker at the top of a panel that disconnects all branch circuits at once and limits the total current the panel can draw, commonly 100, 150, or 200 amps in homes. Its rating, stamped on the handle, is the number electricians start from when calculating capacity for additions like EV charging or electrification projects. It also serves as the service disconnect that emergency responders and inspectors look for.
Where it sits in the glossary
Main breaker is part of the Trade jargon 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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