What the breaker protects
The breaker protects the branch circuit and responds to current above its allowed range.
HVAC equipment also lists maximum overcurrent protection requirements.
Immediate trips
A direct short, grounded compressor, damaged wire, failed contactor, or locked rotor can cause an immediate trip.
The timing of the trip helps narrow the diagnosis.
Trips after running
Overheating connections, high motor current, low voltage, dirty coils, or a weakening breaker can cause delayed trips.
Electric heat circuits may trip only in cold weather.
What to do safely
One reset may be reasonable after turning the thermostat off, but if it trips again leave it off.
Never install a larger breaker or bypass protection.
How it is diagnosed
Technicians measure voltage, current, capacitance, winding resistance, insulation to ground, and equipment pressures.
Burning odor, smoke, heat, or arcing requires urgent attention.
Frequently asked questions
Can a dirty filter cause it?
Indirectly, through overheating or overload.
Can I use a bigger breaker?
No.
Can a surge cause one trip?
Yes.
Is repeated tripping urgent?
Yes.
Need a real diagnosis?
Get measurements, not guesses
Comfort Air Systems can test the actual equipment and explain the findings in plain language.