Types of breakers pdf

Joslyn Clark. Killark Electric. Moeller Electric. NSI Industries. Dongan Electric. Hammond Power. AFCIs These breakers protect from discharges that can cause electrical fires from risks like old wiring systems. Related Posts How to Remove a Circuit Breaker — Safely If you need to replace a circuit breaker, your first thought may be to call an electrician. Circuit Breaker Troubleshooting for Beginners Although every home has a circuit breaker, not every homeowner knows what to do when theirs stop working.

Recent Posts. Featured products Allen Bradley A3C Allis Chalmers AME. Call Now. Allis Chalmers FAA. The circuit breaker whose value lies below the V is known as the low voltage circuit breaker, and above V it is known as a high voltage circuit breaker. The high voltage circuit breaker is further classified into two main categories; they are the oil circuit breakers and the oil-less circuit breaker.

The oil circuit breaker uses oil for an arc extinction. It is further sub-categorized into bulk oil type and the minimum oil type circuit breaker. Bulk Oil Circuit Breaker — The bulk oil circuit breaker uses transformer oil as an arc extinction medium of the circuit breaker. The oil also acts as an insulator between the two conducting parts of the circuit breaker.

The rating range of oil circuit breaker lies from 25MVA at 2. Minimum Oil Circuit Breaker — In the minimum oil circuit breaker, the oil is used for arc extinction by blast action. The main function of the oil in the minimum oil circuit breaker is to interrupt the arc formation, and it is not used for insulating the live parts of the earth.

The oil impulse circuit breaker is the other type of minimum oil circuit breaker. This circuit breaker used oil jet, which is produced by the piston pump for extinguishing the arc. The jet of the oil is placed between the gaps formed by the contacts of the circuit breaker.

The four main types of oil circuit breaker are the air circuit breaker, air blast circuit breaker, Sulphur hexafluoride circuit breaker and the vacuum circuit breaker. Air Circuit Breaker — In air circuit breaker the arc is initiated and extinct in the static air in which the arc moves. Such types of breaker are used in the range of low voltage up to 15KV, and the rupturing capacity of the breaker is MVA.

The reader may note the salient feature of vacuum as an arc quenching medium. As soon as the arc is produced in vacuum, it is quickly extinguished due to the fast rate of recovery of dielectric strength in vacuum. QO stands for Qwik-Open. The operating principle and arc forming phenomenon were explained in the previous article. Now it…. Your email address will not be published. Remember Me. Not a member yet? Register now. Enter something special:. Are you a member?

Login now. Circuit Breaker. As the modern power system deals with huge currents, the special attention should be given during designing of the circuit breaker to safe interruption of the arc produced during the operation of the circuit breaker. It should be noted here that there are no specific criteria of classifying the circuit breakers, but instead, there are a number of ways in which we can categorize them for our easier understanding and knowledge of the operating conditions of the device.

These different categories can be according to the medium in which the circuit breaker operates, the actuating signal on which it works, the different types of constructing and working principles, etc.

The construction and working of these circuit breakers with special emphasis on the way the arc extinction is facilitated are explained in the articles listed in this page. An overview of all the different types of circuit breakers, mentioning their names and how they have been classified as shown in the first part. Further ahead, we will discuss some of the widely used types nowadays.

Table of Contents. Types of Circuit Breaker. Firstly we classify the circuit breakers according to the voltage levels they can operate on. So there are three most used types of circuit breakers in this category. These are:. Low Voltage Circuit Breakers. Indoor Vacuum Circuit Breaker. Outdoor Circuit Breaker. There is another category which is based on the mechanism used to actuate the circuit breaker, which specifies the mechanism of operation of the breaker, there are three further types:.

Circuit Breaker Types based on Interrupting Medium Now considering the medium in which a circuit breaker can operate. The most general way of classification is on the basis of the medium used for arc extinction. Accordingly, circuit breakers may be classified into:. Circuit Breaker Types based on External Design Based on their structural design the circuit breakers are classified as dead tank circuit breakers and live tank circuit breakers.

Live tank and Dead tank circuit breaker. Related Articles.