Circuit Breaker and Terminal Block

Circuit Breakers

Air brake circuit breaker: The air at atmospheric pressure is used as an arc extinguishing medium in Air-Break Circuit Breakers. The high resistance interruption principle is employed in these circuit breakers. The arc is quickly lengthened by means of the arc runners and arc chutes. By cooling, lengthening, and splitting the arc, the resistance of the arc is increased.

In the circuit breakers, the arc resistance increases to a certain point that the voltage drop across the arc becomes higher than the supply voltage and the arc gets extinguished. For lengthening the arc in high voltage air break circuit breakers, the magnetic field is utilized.

Air-break circuit breakers are used in d.c. circuit and a.c. circuits up to 12KV. The air-break circuit breakers are generally designed for indoor purposes and installed on vertical panels or indoor draw-out type switchgear. The main purpose of all the circuit breakers is to protect the electric devices from short circuit currents and overload.

Terminal Block

A terminal block is a long strip that consists of many individual terminals arranged in a row. They are used to terminate or secure wires. It can be used to connect the wires to the ground or else we can use this to connecting electrical switches and outlets to the mains in the case of electrical power.

As a modular insulated block, a terminal block can secure two or more wires together. As the name indicates, factories and industries use this to terminate wires. Terminal blocks usually look like a single level feed-through terminals.

The method in which the wires are secured in the terminal block housing is typically accomplished by three main types: screw terminal, push-button, or push-in. Screw terminal or screw-type terminal blocks secure the wire against the conductor in the terminal block by tightening a screw that closes the clamp.