How to Test an Existing Circuit Breaker Like a Pro

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Periodic circuit breaker tests are essential for ensuring optimal safety and reliability. Testing is necessary when you experience frequently tripped breakers, have a newly installed or replaced breaker that isn’t working properly, or are troubleshooting power loss issues.

Several methods can be used to test a circuit breaker, including multimeter testing and alternative techniques that don’t rely on a multimeter.

In this blog, the electricians at Salient provide detailed tips on testing your circuit breaker like a pro before calling in for expert repairs.

How to Test a Circuit Breaker With a Multimeter

Multimeters are specialized devices that provide accurate readings of voltage and continuity in your electrical system. Normal readings should be 120V/240V, indicating the breaker works properly. If you see no voltage, no continuity, or an inconsistent reading, your circuit breaker may be bad, requiring repair or replacement.

Here’s how to conduct a multimeter test:

Safety first: Shut down power to the panel before handling the breaker to prevent personal injury or electrical fire.
AC voltage: Set the multimeter to AC voltage, either 120V or 240V, depending on the type of breaker.
Test input: Test the input terminal where the breaker connects to the panel to confirm power is reaching the system.
Test output: Test the output terminal where the breaker connects to the circuit to see if any voltage is missing that indicates a faulty breaker.
Test continuity: Switch the multimeter to the OHMS setting; if there’s no continuity, the breaker is likely bad.

How To Test a Circuit Breaker Without a Multimeter

If you don’t have a multimeter tool or don’t feel comfortable using one, there are several other ways to test a circuit breaker without one:

Reset test: Turn the breaker off, then turn it back on. If it trips immediately, it could be defective.
Swap test: If you have an identical breaker in the panel, swap them. You’ll know the old one is bad if the circuit works with the new breaker.
Sniff test: Check for heat or burning smells. Overheating or burn marks indicate a faulty breaker.
Voltage test: Use a voltage tester to see whether power flows through the breaker.

If you can’t determine the issue after using the above troubleshooting methods, contact a professional electrician for further assistance.

Testing a Newly Installed or Replaced Circuit Breaker

Even a newly installed or replaced circuit breaker can be defective if it hasn’t been installed properly or doesn’t match the circuit load. If you suspect an issue with a fresh circuit breaker, here’s how to test it:

Amperage rating: Ensure proper amperage by comparing the breaker’s rating to the circuit requirements.
Secure connections: Check that connections are secure, as loose terminals can cause intermittent power issues.
Power output: Turn the breaker on and test the power output using a multimeter or voltage tester.
Verify operation: Plug in a device or turn on a light to ensure the circuit works properly.

If the breaker won’t stay on, power fluctuates or is inconsistent, or you detect a burning odor or excessive heat, contact a professional electrician for repair or replacement.

What To Do if Your Circuit Breaker Is Bad

If you determine your circuit breaker is faulty after testing, you’ll need to replace it with the correct type and amperage. Check for underlying issues like overloaded circuits or short circuits, and consider upgrading your electrical panel if multiple breakers fail.

Contact a professional if the issue persists after replacement, you suspect wiring issues are at play, or you’re uncomfortable handling electrical components.

Trust Salient With Your Circuit Breaker Repairs

Understanding how to test your circuit breakers is important to ensure continuity and safety for your power supply. Periodic testing is a great way to protect your home or business from unnecessary power disruptions and safety hazards.

If you’re uncomfortable navigating the process or suspect larger issues, don’t hesitate to contact the knowledgeable electricians at Salient for the circuit breaker repairs you need.

Ensure your electrical system is safe — test your breaker today or call an expert for help!