Definition
An automatic switch in your electrical panel interrupting power when current exceeds safe limits, protecting wiring from overheating and fire. Circuit breakers are standard in modern homes instead of fuses.
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Each circuit breaker is rated for a specific amperage (typically 15, 20, 30, 40, or 50 amps) matching the circuit's wiring capacity. When overloaded, the breaker trips, cutting power to that circuit. Modern GFCI and AFCI breakers provide enhanced protection. Breaker problems—false tripping, failure to reset, burning smell—indicate hazardous conditions. Inspectors verify breaker operation, appropriate ratings for wire sizes, and proper labeling.
Pro Tip
Test circuit breakers annually by switching them off and on to ensure proper operation.
Example
An inspector found a double-tapped breaker (two wires under one breaker) in a home's electrical panel, a serious code violation creating fire risk. The homeowner had an electrician install a larger panel with properly sized and dedicated breakers for each circuit.