Скачать или смотреть What is a Breaker in the electrical system?

A breaker, also known as a circuit breaker, is a device designed to protect electrical circuits from overloads and short circuits. It acts as a safety switch that automatically interrupts the flow of electricity when a fault occurs. This interruption prevents damage to the electrical system and reduces the risk of fire or electrical shock.

The main component is the electromagnet, which detects excessive current flow. When the current exceeds a certain threshold, the electromagnet becomes magnetized and triggers the breaker to trip.
Here are 5 basic components used in every circuit breaker:
1- Tripping or Protective Mechanism – Also known as the trip unit, this triggers the operating mechanism once an electrical fault happens.
2- Operating Mechanism – Opens or shuts the breaker to fulfill its protective role.
3- Molded Frame – Outer protective and supportive case of most breakers. It shelters the other component of the breaker providing insulation.
4- 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.
5- Contacts – There are three types of contacts: arcing, auxiliary or main contacts that are used to ensure optimal airflow inside the breaker.

Breakers come in different types and sizes, depending on their application. Residential buildings typically use miniature circuit breakers (MCBs) or residual current circuit breakers (RCCBs).


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