When You Should Use a Contactor to Turn on Lights

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Dicas Flash - Cortes Engehall

Published on Mar 2, 2022
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See how to become a professional, safe electrician capable of performing any service in the electrical field: https://engehall.com.br/cortes-youtube ???? NR10 course with 20% discount ➽ https://engehall.com.br/nr10?src=yt1-... ------ When should I use a contactor together with a switch to activate lamps? For those who don't know yet, the explanation is so simple that you'll learn right away! I have a power contactor here, this guy's purpose is to section up to 3 phases of a three-phase system, behaving like a switch, but for higher loads, such as motors or even a circuit with several more powerful lamps. We know that simple switches support up to 10A, right? But then comes the question, what if the sum of my lighting loads exceeds 10A, like in a warehouse for example, what do I do? That's where the contactor comes in, to simply support all this load and let the switch do only the job of controlling the circuit, free from any higher current from the loads. Let me give you a practical example: I need to install 10 400W mercury vapor lamps, connected in parallel, the voltage is 220V, they must be controlled by only 1 switch. 10 X 400W = 4000W/220V = 18.2A (a higher current than the switch supports) So I need a contactor between the lamps and the switch to do all the heavy lifting!

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