![]() Therefore they are most commonly found in heavy load devices, for instance, transformers. The built-in arc quenching system enables its usage in case of any circuit faults.įurthermore, the built-in extinguishing system within the circuit breaker enables its high withstanding capacity and helps in creating interruptions during heavy loads and faults. The increase in the intensity of the fault increases the power interruption. ![]() These devices instantly identify the fault and prevent or break the electricity flow to the circuit. Considered a protecting device, it protects the electrical equipment against circuit overload or any kind of faults in the circuit. What Is A Circuit Breaker? Source: BenyĪ circuit breaker is the most essential security device of the electrical system. It is the most preferred device for technicians, especially for safety purposes. Furthermore, the isolator prevents any kind of short circuits or faults and safeguards the circuit hardware from any damage. This device disconnects a part of the electrical device from the main current. Furthermore, the isolator has a lesser breaking capacity, and they also lack the built-in arc suppressing system. The presence of an isolator ensures maximum safety during maintenance. Being an offload isolation device it only functions while the current passing through the system is zero. Isolators can be considered as the mechanical device utilized for the disconnection of any electrical equipment or the circuit from the main supply. Many might get confused between them as they are protecting devices, but their purpose is quite different. While the isolators are meant to disconnect in case of an offload situation, the circuit breaker is meant for disconnection during the on-load situation. In this article, we would consider the difference between isolator and circuit breaker. It is significant to understand that each electrical equipment parts have a specific function to perform. The easiest way to distinguish is to look at the electrical symbols on the panel.The mechanism of the electrical devices might often be complicated. The picture below is a circuit breaker and isolating switch of a certain brand dismantled by the editor (the top is the micro-break, the bottom is the isolating switch) ![]() The isolating switch can reliably isolate the equipment working in power failure from the live part, that is, it has an obvious disconnection point to ensure the safety of the staff. It has no current interruption capability and can only be operated after disconnecting the circuit with other equipment. The isolation switch is used to change the circuit connection or isolate the circuit or equipment from the power supply. The main feature of the isolating switch is that it has no arc extinguishing ability and can only open and close the circuit when there is no load current. Overload protection: the circuit breaker trips if the electric current exceeds the rated current of the appliance. With short circuit protection: the live line and the neutral line contact, the instantaneous current is very large, and the circuit breaker trips. It is the most widely used terminal protection electrical appliance in building electrical terminal power distribution devices. Micro-break is short for miniature circuit breaker. The shape of the analog-digital isolation switch and the micro-break (circuit breaker) are very similar. ![]()
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