Can Circuit Breakers Go Bad Without Tripping?

Can Circuit Breakers Go Bad Without Tripping?

In our modern lives, circuit breakers serve as indispensable guardians of electrical safety, diligently protecting our homes and workplaces from potential hazards. These essential devices are designed to trip and interrupt the flow of electricity when faced with overloads, short circuits, or ground faults.

However, what if a circuit breaker goes bad without tripping? This puzzling scenario raises significant concerns about electrical safety and the reliability of our electrical systems.

In this article, we delve into the intriguing question of whether circuit breakers can indeed go bad without tripping, exploring the potential causes, warning signs, and the necessary actions to ensure the continued protection of our electrical infrastructure.

What is a Circuit Breaker?

A circuit breaker is an automatic electrical switch that acts as a fail-safe device, interrupting the flow of current in a circuit when it exceeds a predefined limit [1].

Its primary purpose is to protect the circuit and connected equipment from damage caused by excessive current or a short circuit. Unlike fuses, which need replacement after a single operation, circuit breakers can be reset and reused, making them more convenient and cost-effective.

What is a Circuit Breaker?

Types of Circuit Breakers

Several types of circuit breakers cater to diverse applications. The most common ones include:

  • Miniature Circuit Breakers (MCBs): Typically used in residential and commercial settings, MCBs offer protection against overcurrents and short circuits for individual circuits;
  • Molded Case Circuit Breakers (MCCBs): Often employed in industrial settings, MCCBs can handle higher currents and provide more robust protection for larger electrical loads;
  • Residual Current Circuit Breakers (RCCBs): These specialized circuit breakers sense leakage currents caused by faults in electrical appliances or wiring and quickly disconnect the circuit to prevent electrical shocks;
  • Arc Fault Circuit Interrupters (AFCIs) and Ground Fault Circuit Interrupters (GFCIs): Designed to detect hazardous arc and ground faults respectively, these circuit breakers enhance safety in residential buildings;

How Do Circuit Breakers Work?

The operation of a circuit breaker involves a tripping mechanism that responds to abnormal current conditions. When the current exceeds the rated limit, the tripping mechanism is activated, and the breaker’s contacts open, cutting off the electrical flow. This instant action prevents wires from overheating, which could lead to fires, and protects valuable electrical equipment from damage.

Importance of Circuit Breakers in Safety

Circuit breakers are integral to electrical safety for several reasons:

  • Fire Prevention: By swiftly interrupting overcurrents, circuit breakers minimize the risk of electrical fires, safeguarding lives and property;
  • Equipment Protection: Expensive electrical devices and appliances are shielded from damage caused by electrical surges and short circuits, ensuring their longevity;
  • Electrical Shock Prevention: Specialized circuit breakers, like GFCIs and RCCBs, prevent electric shocks, reducing the risk of electrocution;
  • Convenience: Circuit breakers can be reset after tripping, eliminating the need for replacement and reducing downtime;

Regular Maintenance and Testing

To ensure circuit breakers function correctly when needed, regular maintenance and testing are crucial. Routine inspections by qualified electricians can identify potential issues and rectify them before they become hazards. Periodic testing confirms that the circuit breakers respond appropriately to overloads and short circuits, maintaining the safety of the electrical system [2].

Regular Maintenance and Testing

Can Circuit Breakers Go Bad?

Circuit breakers can go bad or become faulty over time. Despite their robust design and ability to withstand a certain number of operations, circuit breakers are not immune to wear and tear, environmental factors, and other issues that can lead to their malfunctioning.

When circuit breakers go bad, they may not perform their intended function of interrupting the electrical circuit during overloads or short circuits, posing potential safety risks.

Here are some common reasons why circuit breakers can go bad:

  • Age and Usage: Like any electrical component, circuit breakers have a limited lifespan. The more they are used, the more wear they experience over time. Frequent tripping and resetting, especially in older breakers, can lead to mechanical fatigue and decrease their reliability;
  • Overloading: Circuit breakers are designed to handle specific current loads. If they are subjected to consistently higher currents than their rated capacity, they may degrade over time and become less effective in tripping during overloads;
  • Corrosion and Contamination: Circuit breakers installed in damp or corrosive environments may be prone to rust and corrosion. These conditions can hinder the proper operation of the internal components, leading to malfunction;
  • Loose Connections: Loose electrical connections within the circuit breaker can cause overheating and arcing, which can damage the breaker’s internal components;
  • Manufacturing Defects: In some cases, circuit breakers may have inherent manufacturing defects that can lead to premature failure;
  • Environmental Factors: Extreme temperatures, humidity, and exposure to environmental contaminants can impact the performance and reliability of circuit breakers;
  • Physical Damage: Mechanical impact or mishandling can damage the internal mechanisms of a circuit breaker, rendering it ineffective;

It’s important to note that malfunctioning circuit breakers can pose significant safety hazards. A faulty circuit breaker may fail to trip during an electrical overload or short circuit, potentially leading to electrical fires or damage to electrical devices and appliances. Additionally, a malfunctioning circuit breaker may lead to frequent nuisance trips, disrupting the normal operation of electrical systems and causing inconvenience.

Signs That Your Circuit Breaker Is Going Bad:

1. The Circuit Breaker Frequently Trips

One of the most apparent signs that your circuit breaker may be going bad is when it frequently trips or switches off without apparent reason. Circuit breakers are designed to trip when they detect an overload or a short circuit to prevent electrical damage and fire hazards. However, if your circuit breaker trips more often than usual, especially under normal electrical loads, it could be a warning sign of a failing breaker.

Signs That Your Circuit Breaker Is Going Bad:

Frequent tripping may indicate that the internal components of the circuit breaker are worn out or damaged, reducing its ability to handle the electrical current safely. It could also be a symptom of an underlying electrical problem, such as a faulty appliance or a wiring issue. In any case, it is crucial to have a qualified electrician inspect the circuit breaker and the electrical system to diagnose the cause and resolve the problem [3].

2. The Breaker Looks Damaged Or Scorched

A visual inspection of your circuit breaker can provide valuable clues about its health. If you notice any visible damage, such as cracks, chips, or scorched areas on the circuit breaker’s body, it is a clear indication that something is wrong. Damaged circuit breakers may not function correctly and could pose safety risks.

Scorch marks on the circuit breaker may be a sign of overheating due to loose connections or excessive current flow. In such cases, the circuit breaker may not trip as intended during an overload, potentially leading to electrical fires or equipment damage. If you come across any physical damage or signs of overheating, it is essential to replace the circuit breaker immediately to maintain the integrity of your electrical system.

3. The Breaker Feels Hot

When performing a visual inspection of the circuit breaker, take note of its temperature. A properly functioning circuit breaker may feel slightly warm to the touch, which is normal during operation. However, if the circuit breaker feels excessively hot or shows signs of overheating, it could indicate a problem.

Excessive heat can be caused by several factors, including loose connections, corroded contacts, or an overloaded circuit. If left unaddressed, the high temperature can damage the internal components of the circuit breaker, leading to failure or unsafe operation. If you notice that your circuit breaker feels unusually hot, it is essential to turn off the power to that circuit immediately and seek professional assistance to identify and rectify the underlying issue.

4. There’s A Burnt Electricity Smell

A distinctive burnt or acrid smell near your circuit breaker panel is a cause for concern and should not be ignored. The presence of such a smell often indicates overheating or arcing within the electrical system, which can be dangerous. Arcing occurs when electricity jumps or flows through the air between damaged or loose connections, producing heat and a burning smell.

The burning smell could be a result of a failing circuit breaker or a wiring problem within the panel. Ignoring this warning sign could lead to electrical fires or other hazardous situations. If you detect a burnt smell near your circuit breaker, turn off the power immediately and contact a licensed electrician to inspect and address the issue promptly.

5. Breaker Fails In “On” Position

A properly functioning circuit breaker should remain in the “On” position when there are no electrical faults. However, if you find that your circuit breaker refuses to stay in the “On” position and keeps tripping back to the “Off” position, it is a clear indication of a problem.

This issue is commonly referred to as a “tripped breaker that won’t reset”. There could be several reasons for this behavior, such as internal mechanical failures or damaged components. Continuing to force the breaker back to the “On” position without addressing the underlying cause can be hazardous and may result in a non-functional circuit breaker when you need it the most.

In such situations, it is crucial to stop using the circuit breaker immediately and consult a professional electrician to diagnose and resolve the issue. Attempting to fix the problem yourself can be dangerous and may void any warranty on the circuit breaker.

What Reasons Are Behind A Circuit Breaker Trip:

1. Ground Faults

Ground faults occur when an exposed conductor, such as a wire, comes into contact with a grounded surface or conducts electricity to the ground. Ground faults can happen due to damaged wiring, faulty appliances, or environmental factors. When a ground fault occurs, the circuit breaker senses the abnormal current flow and quickly trips to prevent electrical shocks and potential fires.

What Reasons Are Behind A Circuit Breaker Trip:

Ground fault circuit interrupters (GFCIs) are specialized circuit breakers designed to detect ground faults and provide additional protection in areas where electrical devices are likely to come into contact with moisture, such as bathrooms, kitchens, and outdoor outlets. GFCIs are instrumental in preventing severe injuries and fatalities caused by electrical shocks [4].

2. Circuit Overload

Circuit overload is a common reason for circuit breaker trips. It happens when too many electrical devices or appliances draw more current than the circuit can handle. Overloading can occur when multiple high-wattage devices are connected to the same circuit simultaneously.

For example, if a circuit is designed to handle a maximum load of 15 amps, and you connect several high-power appliances that collectively draw 20 amps, the circuit will become overloaded. In response, the circuit breaker detects the excessive current flow and trips to prevent overheating of the wires and potential electrical fires.

To avoid circuit overload, distribute electrical devices evenly across multiple circuits and be mindful of the total power consumption on each circuit.

3. Short Circuit

A short circuit is a more severe type of fault that occurs when a hot wire comes into direct contact with a neutral or ground wire. This creates a low-resistance path for the current to flow, causing a sudden surge of electricity.

Short circuits often result from damaged or frayed wires, loose connections, or faulty equipment. When a short circuit occurs, the circuit breaker senses the rapid increase in current and immediately trips to protect the circuit and the connected devices.

It is essential to address short circuits promptly, as they can generate high levels of heat and pose a significant fire hazard.

4. Overloaded Breaker

Circuit breakers themselves have specific ratings based on the maximum current they can handle safely. Over time, circuit breakers can become weakened due to age, frequent tripping, or other factors. When a circuit breaker becomes weakened, it may trip more easily, even when the electrical load is within its rated capacity.

This phenomenon is known as an “overloaded breaker”, where the breaker trips prematurely, indicating that it may need replacement. If you experience frequent breaker trips with no apparent cause, have a qualified electrician inspect the breaker and determine if it needs replacement.

5. Low Voltage

Voltage refers to the electrical pressure that drives the current in a circuit. When the voltage supplied to a circuit drops significantly below its standard level, the circuit may draw more current to compensate, potentially leading to an overload.

What Reasons Are Behind A Circuit Breaker Trip:

Low voltage can result from issues with the power grid, damaged power lines, or problems within the electrical system. If the circuit breaker detects the excessive current due to low voltage, it will trip to prevent damage to the circuit and connected devices.

Addressing low voltage issues promptly is essential to maintain the efficiency and safety of electrical systems.

6. Visible Signs

Sometimes, circuit breaker trips can be triggered by external factors that cause visible signs of damage or interference with the electrical system. These signs may include:

  • Water damage or exposure to moisture in the electrical panel, causing corrosion and conducting current to unintended paths;
  • Presence of pests or rodents in the electrical panel, leading to chewed wires and potential short circuits;
  • Physical damage to wires, insulation, or electrical components within the panel;
  • Loose or faulty connections that cause arcing and overheating;

If you notice any of these visible signs, it is crucial to have a licensed electrician inspect the electrical system and address any underlying issues.

7. Overheating Issues

Overheating is a serious concern when it comes to electrical systems. Circuit breakers can trip when the temperature within the electrical panel exceeds safe limits due to loose connections, faulty wiring, or excessive electrical loads. Overheating can lead to component failure, damage to the panel, and increased fire risk.

If the circuit breaker detects overheating, it will trip to prevent further damage and potential hazards. Regular inspection and maintenance of the electrical system can help identify and rectify overheating issues before they escalate.

What Reasons Are Behind A Circuit Breaker Trip:

What Can Overload A Circuit Breaker:

  • High-Power Appliances: Appliances that draw a significant amount of power, such as air conditioners, space heaters, electric stoves, and water heaters, can put a heavy load on the circuit. Running multiple high-power appliances simultaneously on the same circuit can lead to an overload;
  • Multiple Devices on One Circuit: Connecting too many electrical devices or appliances to a single circuit can exceed its capacity. This situation is common in homes with outdated electrical systems that have limited circuits for a specific area [5];
  • Extension Cords and Power Strips: Overloading can occur when multiple devices are connected to extension cords or power strips that are not rated to handle the combined load. Using these devices for high-power appliances can be particularly risky;
  • Faulty or Worn-out Wiring: Damaged or old wiring can increase the resistance in the circuit, leading to overheating and potential overloads. Frayed wires, loose connections, or corroded terminals can all contribute to this issue;
  • Lighting Fixtures: High-wattage light bulbs or multiple light fixtures connected to the same circuit can cause an overload, especially if used along with other electrical devices in the same area;
  • Defective Appliances: Faulty or malfunctioning appliances can draw more current than they should, putting a strain on the circuit and causing it to trip;
  • Electrical Shorts: A short circuit occurs when a hot wire comes into direct contact with a neutral or ground wire. This low-resistance path allows a large amount of current to flow, leading to an immediate overload and circuit breaker trip;
  • Inadequate Electrical Service: If the electrical service to the building is insufficient to handle the overall electrical demand, it can lead to frequent overloads and circuit breaker trips;
  • Improper Wiring or Circuit Design: Poorly designed electrical circuits, such as circuits with inadequate wire gauge for the load they carry, can cause overloads;
  • Simultaneous Use of High-Power Devices: In some cases, an overload may occur due to the simultaneous use of several high-power devices in different areas of the home or building, putting a collective strain on the electrical system;

What Can Overload A Circuit Breaker:

Can a Circuit Breaker Fail Without Tripping?

Yes, a circuit breaker can fail without tripping, and this situation is known as a “failed open” condition. In a normal and properly functioning circuit breaker, it is designed to trip or open the circuit when it detects an overload, short circuit, or ground fault. This interruption of the circuit’s current flow protects the electrical system from potential damage and reduces the risk of electrical fires.

However, there are instances where a circuit breaker may develop internal faults or malfunctions that prevent it from tripping when it should. In a failed open condition, the circuit breaker’s internal mechanisms may become stuck or damaged, causing it to remain in the closed position even when there is an electrical fault.

Several reasons can lead to a circuit breaker failing without tripping:

  • Mechanical Failure: Over time, the moving parts within a circuit breaker can wear out or become damaged. When the mechanical components responsible for tripping, such as the trip coil or springs, fail to function correctly, the circuit breaker may not trip as intended;
  • Aging: As circuit breakers age, they may experience degradation of internal components, which can affect their performance. Old circuit breakers may become less reliable and may not trip as quickly or accurately as they should;
  • Overheating: Circuit breakers are designed to handle a certain amount of heat generated during normal operation. However, if the circuit breaker experiences excessive heat due to overloaded circuits or poor ventilation, it may lead to internal damage that hinders its ability to trip properly;
  • Corrosion or Contamination: Exposure to moisture or corrosive substances can cause damage to the internal contacts and connections of the circuit breaker, affecting its overall functionality;
  • Manufacturing Defects: In rare cases, circuit breakers may have inherent manufacturing defects that cause them to fail without tripping;
  • Improper Installation: Incorrect installation or improper maintenance practices can lead to issues with the circuit breaker’s operation and may contribute to a failure to trip;

A failed open circuit breaker poses significant safety risks, as it effectively becomes a live circuit even when there is an electrical fault. In such situations, the circuit may experience overloads or short circuits, leading to potential fires, electrical shock hazards, and damage to electrical equipment and appliances [6].

To ensure the proper functioning of circuit breakers, regular maintenance and periodic testing are essential. Routine inspections by qualified electricians can identify potential issues with circuit breakers and other electrical components.

Additionally, adhering to electrical safety standards and guidelines during installation and maintenance can help prevent failures and ensure the safety and reliability of the electrical system. If you suspect that a circuit breaker is failing or not functioning correctly, it is essential to have it inspected and replaced by a licensed electrician promptly.

Can a Circuit Breaker Fail Without Tripping?

What to Do When Circuit Breakers Go Bad?

When circuit breakers go bad or show signs of malfunction, it is crucial to take immediate action to ensure the safety and reliability of your electrical system.

Here’s what you should do when you suspect that a circuit breaker is faulty or not functioning correctly:

  1. Turn Off Power: If you notice any visible signs of damage, overheating, or burning smells near the circuit breaker panel, immediately turn off the power to the affected circuit by switching off the corresponding breaker. This precautionary measure helps prevent potential hazards, such as electrical fires or further damage;
  2. Identify the Problem Circuit: Determine which circuit breaker is causing the issue. If you are experiencing frequent tripping or other problems with a specific circuit, identify the corresponding breaker on the panel;
  3. Reset the Circuit Breaker: If the circuit breaker has tripped, try resetting it by firmly switching it to the “Off” position and then back to the “On” position. However, do not force the breaker if it won’t reset, as this could indicate a more serious problem;
  4. Check for Load Issues: Review the electrical devices and appliances connected to the circuit in question. Make sure that the load on the circuit does not exceed the breaker’s rated capacity. If the circuit is handling high-power appliances or multiple devices simultaneously, consider redistributing the load across multiple circuits to avoid overloads;
  5. Inspect for Visible Damage: Perform a visual inspection of the circuit breaker panel and the affected circuit. Look for any visible signs of damage, such as cracks, scorched areas, loose wires, or signs of arcing. If you find any visible issues, it is essential to have a qualified electrician inspect and address the problem;
  6. Test Other Circuits: If you suspect a particular circuit breaker is faulty but are uncertain, try testing other circuits in the panel to see if they function correctly. This test can help identify if the issue is isolated to one breaker or if there is a broader problem with the electrical system;
  7. Contact a Licensed Electrician: Electricity is dangerous, and electrical work should only be performed by qualified professionals. If you are unsure about the issue or lack experience in electrical repairs, it is best to contact a licensed electrician for inspection, diagnosis, and repair. A professional electrician can identify the root cause of the problem and take appropriate actions to fix or replace the faulty circuit breaker;
  8. Consider Upgrading: If you have an older electrical system with frequent breaker failures or other recurring issues, it might be beneficial to consider upgrading your electrical panel and circuit breakers to modern ones with better capabilities and safety features;
  9. Follow Safety Guidelines: While waiting for a professional electrician, exercise caution and follow electrical safety guidelines. Keep children and pets away from the affected area and avoid using the circuit until the issue is resolved [7];
Remember that circuit breakers play a critical role in electrical safety, and a malfunctioning breaker can pose significant risks. Promptly addressing the problem with the help of a qualified electrician ensures the protection of your electrical system, and appliances, and, most importantly, the safety of everyone in your home or building.

What to Do When Circuit Breakers Go Bad?

Testing Your Circuit Breaker:

1. Identify the Breaker and What It’s Protecting

Locate the electrical panel in your home or building. The panel contains multiple circuit breakers, each responsible for protecting a specific electrical circuit. To test a particular circuit, identify the corresponding breaker on the panel. Most circuit breakers are labeled to indicate the area or appliances they protect. If your panel lacks clear labeling, you may need to enlist the help of someone to switch the breaker while you check which devices lose power.

2. Unplug the Relevant Appliances and Devices

Before conducting any tests, ensure that all appliances and devices connected to the circuit in question are unplugged or switched off. This precautionary measure prevents any potential damage to the devices during the testing process. Additionally, it ensures that the circuit is not under load, providing accurate results when you perform the test.

3. Reset the Circuit Breaker

If the circuit breaker has tripped and turned off the power to the circuit, reset it by switching it firmly to the “Off” position and then back to the “On” position. Listen for a distinct clicking sound during this process, which indicates that the breaker has successfully reset.

4. Measure the Voltage

With the circuit breaker reset and no devices connected, use a voltage tester or multimeter to measure the voltage at the outlets or electrical points connected to the circuit. Ensure that the meter is set to the appropriate voltage range. A reading of 120 volts (for residential systems in most countries) indicates that the circuit is receiving the correct voltage supply. If the voltage reading is significantly lower or zero, it could indicate a problem with the breaker or the electrical supply to the circuit.

5. Trip the Circuit Breaker (Optional)

As an optional step, you may choose to simulate an overload or fault on the circuit to test the breaker’s response. You can do this by connecting a higher-powered device to the circuit or using a circuit tester to create a short circuit. If the circuit breaker trips and disconnects the power during this simulation, it indicates that the breaker is functioning correctly.

What to Do When Circuit Breakers Go Bad?


1. What happens if a circuit breaker doesn’t trip?

If a circuit breaker doesn’t trip when it should, it can lead to several potential issues. The primary purpose of a circuit breaker is to protect the electrical circuit from overloads, short circuits, and ground faults. When these faults occur, excessive current flows through the circuit, which can cause wires to overheat, leading to potential electrical fires.

If the circuit breaker fails to trip, the wires and connected electrical devices can be subjected to dangerous levels of current, increasing the risk of electrical hazards, damage to appliances, and fire outbreaks.

2. What do you do when a breaker won’t reset?

If a circuit breaker won’t reset, follow these steps:

  1. Turn off all devices and appliances connected to the circuit;
  2. Firmly switch the breaker to the “Off” position;
  3. Wait for a moment before switching it back to the “On” position;

If the breaker still won’t reset, do not force it. Instead, consult a qualified electrician to inspect and resolve the issue.

3. What is the lifespan of a circuit breaker?

The average lifespan of a circuit breaker is typically around 30 to 40 years. However, this can vary depending on factors such as usage, load demands, environmental conditions, and the quality of the breaker itself. Regular maintenance and inspections can help extend the lifespan of circuit breakers.

4. How do you test if a breaker is working?

To test if a breaker is working, follow these steps:

  1. Turn off all devices and appliances connected to the circuit;
  2. Reset the circuit breaker by firmly switching it to the “Off” position and then back to the “On” position;
  3. If the breaker trips immediately after resetting, it is functioning correctly;

Optionally, you can use a circuit tester or voltage meter to verify if the circuit is receiving power when the breaker is in the “On” position.

5. How many times can you trip a breaker?

Circuit breakers are designed to handle multiple tripping events, and they are rated for a specific number of tripping cycles. The number of allowable trips varies depending on the type and manufacturer of the breaker. Common residential breakers are typically rated for thousands of tripping cycles, ensuring their reliability over their service life.

6. What happens if you have a weak breaker?

A weak breaker may trip prematurely even under normal loads, leading to frequent nuisance trips. Additionally, a weak breaker may struggle to trip during an actual overload or fault condition, compromising the protection of the electrical circuit. If you suspect a weak breaker, it is essential to have it inspected and replaced by a qualified electrician.

7. What happens if you keep blowing a breaker?

If a circuit breaker keeps tripping, it indicates that there is an underlying issue causing excessive current flow in the circuit. Potential causes include overloads, short circuits, ground faults, or a weak breaker.

Continuously blowing a breaker should not be ignored, as it can lead to electrical hazards, damage to appliances, and fire risks. Professional diagnosis and repair are necessary to address the root cause of the repeated tripping.

8. Can I replace a breaker myself?

While replacing a circuit breaker may seem straightforward, it involves working with electricity, which can be dangerous if not handled properly. It is generally recommended to have a licensed electrician replace a breaker to ensure safety and compliance with electrical codes.

9. When a circuit breaker trips, should you immediately reset it?

When a circuit breaker trips, it is essential to investigate the cause of the trip before resetting it. Tripping can indicate an overload, short circuit, or ground fault, which requires resolution to avoid a potential recurrence. Resetting the breaker without addressing the underlying issue could lead to repeated trips and compromise the safety of the electrical system.

10. What are the failure modes of circuit breakers?

The failure modes of circuit breakers include mechanical failure (e.g., worn-out components), electrical failure (e.g., faulty contacts or insulation), and thermal failure (e.g., overheating due to an excessive load or poor ventilation).

11. Can I replace a circuit breaker without turning off power?

No, replacing a circuit breaker should always be done with the power turned off. Working on live electrical circuits is extremely dangerous and can lead to serious injuries or even death. Always de-energize the circuit and use proper safety precautions before attempting to replace a circuit breaker.

12. What is the difference between a switch breaker and a circuit breaker?

A switch breaker (or simply a switch) is a device used to manually control the flow of electricity to a circuit or device, allowing you to turn it on or off. A circuit breaker, on the other hand, is an automatic safety device that trips and interrupts the flow of current when it detects an overload, short circuit, or ground fault.

13. What is the maximum load on a 15-amp breaker?

A 15-amp circuit breaker is designed to handle a maximum load of 15 amps (or 1,800 watts) at 120 volts. Exceeding this load can cause the breaker to trip and interrupt the circuit.

Useful Video: How to Tell if a Breaker is Bad