Everyone is aware of the importance of electrical safety measures but many of us lack knowledge of the various types of electrical devices available in the market to ensure the safe functioning of electrical equipment. Switchgear is an umbrella term that comprises the most significant set of devices that augment such safety. The two most common names among switchgear, found almost in every electrical power system, are circuit breakers and isolators/disconnectors. These two devices are indispensable for electrical power systems.Â
Both the circuit breaker and the isolator are entrusted with the common function of disrupting or isolating connections in electrical circuits in case there is a problem with the electrical system. This close functional association between the two leads many people to confuse the isolator with the circuit breaker and vice versa. In this article, we are going to bust this common misconception by looking at the difference between circuit breakers and isolators. Let’s get to know more about these essential safety devices.
A circuit breaker is a device that works like a switch to ensure electrical safety. Circuit breakers are installed in series within an electrical circuit such that they are enabled to stop current flow whenever a fault is detected. The principal function of a circuit breaker is to safeguard against short-circuiting and overloading in a circuit. A relay system is used by the circuit breaker to detect such faults in the circuit. Once faults are detected, it automatically stops the flow of current to prevent damage to both the circuit and connected appliances or equipment.
Circuit breakers come with operating options. They can be switched on automatically as well as manually. They are also equipped with an extinguishing system that allows them to function even during on-load conditions. Circuit breakers are typically attached to electrical devices and equipment such as transformers. They are capable of dealing with heavy load currents.Â
Read Also - Types Of Circuit Breakers And Their Importance
Isolators are also often called disconnectors. It is a unit of switchgear that can be used to disconnect the entire circuit or even isolate parts of an electrical circuit. Essentially, an isolator or disconnector is a disconnecting switch that can be used only under off-load conditions, i.e., when there is no current flow in the circuit. This is a principal point of difference between a switch isolator and a circuit breaker.
The disconnector usually comes into use when an electrical system is to undergo repair or maintenance. Such an electrical system needs to be isolated to protect the technician as well as equipment. In the manner of a capacitor, an isolator allows the AC components to function while blocking the DC components.Â
An isolator is installed separately within the electrical circuit to ensure safe maintenance and repair of faulty sections. The most significant aspect of the isolator is that no current should be flowing through it when it is being operated.Â
While both circuit breakers and isolators are part of switchgear components, they have certain unique characteristics of their own. Here are some of the essential characteristics of each:
Read Also - Understanding The Difference Between Isolators, Rccbs, And Mcbs: A Comprehensive Guide
Now that we know the essential characteristics of both - a circuit breaker and an isolator, let us dive into the difference between a switch disconnector and a circuit breaker.
Basis of Difference |
Circuit Breaker |
Isolator/Disconnector |
|
Protective electrical device that acts as a switch to interrupt current flow through a circuit whenever faults are detected. |
A kind of disconnecting switch is used to isolate an electrical system from the main power supply for safety reasons. |
|
A single unit consisting of an electromagnetic switch and a relay system. |
A simple mechanical switch. |
|
Manual and automatic |
manual |
|
On-load; can be used when the power supply is on |
Off-load; no current can flow through the circuit when in use |
|
Low, Medium, High |
Low |
|
Protects the entire circuit from surge currents by switching off the power supply as and when required. |
Isolates faulty parts of a circuit to facilitate repair and/or maintenance. |
|
Domestic, commercial, and industrial applications |
Mostly industrial applications |
|
more |
less |
|
More expensive |
Less expensive |
Now that you understand the differences between isolators and circuit breakers and the role played by each of these two components, you can confidently look for the protective device that best suits your specific requirements.
Whether you are looking for switchgear components for your household or industrial applications, Schneider Electric is a brand name you can trust. Visit the Schneider Electric eShop to look for and secure the best deals on all kinds of protective electrical equipment, including isolators and circuit breakers.
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