I never thought anyone might want to use poor circuit breaker in this type of environment. I mean 50/60Hertz is what she’s designed for. But, we learn everyday… What if you did want to use it under a different frequency? ===>>>OOPS…You are not logged in for this group!
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In an enclosure…do I use an isolator or a circuit breaker? Sometimes it gets confusing as what shall we use as the mains switch for a DB or electrical panel/enclosure: – Do we use an isolator or do we use a circuit breaker? Let’s just throw out a few common-sense pointers:
An introduction to the circuit breaker tripping curve. So, If I pulled 6Amps through a 6amp circuit breaker will it trip? If you said yes then you must hang around this site much more frequently. So when does a circuit breaker trip then?
A circuit breaker will be damaged by a higher than designed fault current that it has to make/break…this is the “Rated Breaking Current”, normally referred to as the kA of the circuit breaker. If this energy was of the sort to melt the contacts together before the circuit breaker had time to react we have […]
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What is this IP rating really all about? (all) IP = International Protection Rating. It’s a cool coincidence that it could stand for Ingress Protection – for that is what I suspect most of us remember it by. My simple definition is:- A measure of how sealed ANY product is in terms of solids […]
Primary protection of transformers. For the primary I always simply said: The control fuse/circuit breaker with a current rating of minimum transformer rating = 1.3xImax that’s it. The thinking behind this is: We normally install overload protection on the secondary and only short circuit protection on the primary. The factor of 1.3x accounts for the […]
Do you protect the primary or secondary – or both? This applies to just about all types of transformers, but there are occasions when special considerations come into effect, like safety applications when it is unsafe to have protection devices in a circuit and so forth The short answer is: Protect the input from short […]
I promise you will never forget this any more! kW = voltage x current x pf We say the better the power factor i.e. the closer to 1 the better… So: Say 34.4kW= 400V x 100amp x 0.869(pf) Say 40kW= 400V x 100amp x 1(pf) – You get more kW with bad power factor…or do […]
