Circuit breaker

By definition a circuit breaker is an electrical safety device, a switch that automatically interrupts the current of an overloaded electric circuit, ground faults, or short circuits. Circuit breakers "trip", shut off, current flow after protective relays detect a fault. Unlike fuses that were used previously, circuit breakers are not usually damaged so they can be reset as opposed to being replaced. Circuit breakers are used in residential and in industrial applications. There are 5 basic components used in every circuit breaker: • Tripping or Protective Mechanism – Also known as the trip unit, this triggers the operating mechanism once an electrical fault happens. • Operating Mechanism – Opens or shuts the breaker to fulfill its protective role. • Molded Frame – Outer protective and supportive case of most breakers. It shelters the other component of the breaker providing insulation. • Arc Chutes – Located near the contacts, chutes prevent damage and mostly heat from intervening with the circuit breaker’s functionality and move apart when a fault occurs. • Contacts – There are three types of contacts: arcing, auxiliary or main contacts that are used to ensure optimal airflow inside the breaker. (Emax 2) Heavy industrial application - can involve switchgear Optimal reliability - Hospitals, Data Centers Serviceable in the field Best choice for heavy switching (Contacts replaceable) 30 Cycle Withstand Frame sizes 250-6000A built on ANSI rated True switchgear breakers Used i...

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We’ve all been annoyed by a Before you Overcurrent can damage electrical equipment in your home or give you a shock if you happen to be in the path of the current. Circuit breakers work quickly to mitigate the effects of overcurrent, so the National Electrical Code (NEC) requires them for every circuit in your panel, with limited exceptions. Here are the most common types of breakers you’re likely to encounter in your home. On This Page • • • • • Standard, Single-Pole Breaker BanksPhotos/Getty Images A single-pole breaker protects a single circuit in your home’s electrical system. This single circuit might power the lights in your living room or feed receptacles in your kitchen. Single-pole breakers take up one slot in your home’s electrical panel and typically protect 15-amp and 20-amp circuits. In a normal scenario, the breaker sits in the circuit like an open gate, allowing current to circulate in the wires, going out to where it’s needed and back again to the panel. When a circuit gets overloaded or experiences a sudden surge called a fault, the gate shuts, stopping the flow of electricity in the circuit. The breaker can be reset and used again, but only if you resolve the overcurrent situation. If a breaker keeps tripping, investigate. If you’re not sure what’s causing it, call a licensed electrician for help. The ability to reset a breaker is a significant advantage over Standard, Double-Pole Breaker BanksPhotos/Getty Images Double-pole breakers work the same way as ...

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The receptacles, light fixtures, appliances and switches in your home are all part of multiple branch circuits. These begin and end in your breaker box. All the receptacles in a single room may be part of one circuit, wired to a single breaker. Breaker boxes can go by many names, such as electrical panels, load centers or service panels. A breaker box holds This guide teaches you how to wire a breaker box for a new circuit breaker, so you can know how to install a circuit breaker whenever you need to wire a new room or appliance. To wire a new circuit, identify an open slot in your breaker box for a new circuit breaker. Work during the daytime as you will need to shut off all power in your home during most of the project.   • Measure the room or rooms where you’ll be installing the new branch circuit, and draw a detailed, accurate floor plan. Circuit breakers are typically located in the garage, basement, a storage room or a hallway.  • On the floor plan, mark the position of every receptacle, switch, fixture and major appliance you plan to add to the circuit.   • Draw lines representing the electrical cable for the circuit. The electrical cable should begin in the breaker box and run to every device in the circuit.   • Add up the wattage for all the devices you expect to connect to the new circuit. This will give you the new circuit’s total load. (Remember that receptacles and lighting can't be installed on more than a 15- or 20-amp breaker. Make sure you...