Breakers and Electrical Panels
Definition
General concept of breakers and electrical panels
Breakers and electrical panels are fundamental components in the distribution and protection of electrical installations. A breaker, or automatic switch, is a device that protects an electrical circuit from damage caused by overloads or short circuits, automatically interrupting the flow of current when it detects abnormal conditions.
On the other hand, an electrical panel is an organized set of electrical devices, where breakers, fuses, meters and other control and protection components are housed. Its main function is to distribute electrical energy in a safe and orderly manner to the different circuits of an electrical installation.
Components and Operation of Breakers
Internal structure and types of breakers
Breakers are composed of a trip mechanism, electrical contacts, a spring system and a thermal or magnetic release. The thermal release responds to prolonged overloads, while the magnetic release responds to instantaneous short circuits. Depending on their design, they are classified as thermal, magnetic or combined breakers, depending on the protection methods they integrate.
There are single-phase, two-phase and three-phase breakers, depending on the type of electrical installation they protect. Single-phase breakers are used in residential circuits or small businesses, while two-phase and three-phase breakers are common in more complex industrial or commercial installations.
Principles of operation and shooting
The operation of the breaker is based on constantly monitoring the current that circulates through the circuit. When the current exceeds a preset value, the internal mechanism is activated to open the circuit and prevent further damage. In the event of an overload, the thermal trip heats a bimetallic sheet that deforms and activates the opening of the circuit.