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What Are Fuses, Safety Switches And Circuit Breakers?

What Are Fuses, Safety Switches And Circuit Breakers?

17 August, 2017

The priority of any electrical installation is to ensure human safety. However careful we may be, accidents sometimes happen and mostly because of a momentary lapse in concentration. Let us take a look at three common devices which we take for granted.

Any electric cabling service would tell you that fuses and circuit breakers protect the equipment and not the people. These are collectively known as MCB’s. Remember that human bodies are very sensitive to electricity, and a current of 1 ampere is enough to cause an interruption of your heartbeat.  Visit this link http://www.davefenechelectrical.com.au/cabling.html for more info on electric cabling service Sydney.

You’ll need medical attention immediately.It’s best that you enlist the help of level 2 electrical technicians to check for any problems if you feel that a regular maintenance is due. Do NOT attempt to do anything by yourself. You might end up losing your life, it’s not worth it.Circuit breakers and fuses are useful in disconnecting a faulty circuit, i.e. a circuit where an excess amount of current is passing through. Fuse and circuit breakers sometimes take seconds to do their job, or even minutes. They work immediately in the case of dead short circuits, like for example, a nail piercing a conductor. Keep in mind that a person who is accidentally connected across a 220 volt will just be thrown clear due to the force of the jolt that takes place. In other cases, if the fuse or circuit breaker does not interrupt the circuit, they’ll simply die.

A safety switch is also called a residual current device. Sometimes, we call it an earth leakage circuit breaker. For example, if you stick a fork in the toaster to pry out a slice of bread, then current will flow to the earth through the earth pin of the toaster plug, and also the earth wire of the power circuit, straight back to the switchboard, where the safety switch is actually located. Safety switches are activated with 30 thousandths of a second, they’re that fast. They reduce the possibility of electrocution immensely and are now a standard feature of all devices.

Fuses are rarer, only found in old electrical installations. The most common types are the rewire able and porcelain fuse holder types. MCB’s or miniature circuit breakers have replaced fuses in switch boxes. The only fuse you’ll get to see is the service fuse in domestic installations.

A separate MCB can be installed in the switch box to protect a particular device from malfunctioning and causing harm to the user. In fact, for each device, a separate MCB can be installed. MCB’s have innate current sensing, and this allows it to stop electricity flow when more current compared to the MCB’s rated value is drawn. This mechanism is both magnetic and thermal. As the strip heats up, it acts on the switch’s position, immediately cutting off electricity.