A much deeper discussion of the tripping GRAPH presented by manufacturers. This is a continuation from posts: An introduction to the circuit breaker tripping curve. What does an adjustable circuit breaker really adjust and The LSI(G) circuit breaker controller in perspective A deeper discussion of the LSI (G) from a manufactures point of view. For […]
There are many who has answered this question before:- Most say relays are JUST smaller brothers of contactors. Others say:- Up to a certain amperage (30/40Amp) it is a relay and beyond that it is a contactor. Others say:- In the construction, the relay coil sits on the side and a contactor it sits in […]
This topic jumps straight into the topic of diffrent manufacturer ACB trip relay controllers and the in-depth functions…and it will always be an introduction because this can really go deep… The introduction is here. (don’t worry it opens in a new tab so you can always come back here) And here is the total introduction […]
===>>>OOPS…You are not logged in for this group!
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 […]
===>>>OOPS…You are not logged in for this group!
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 […]