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Thank you all for the help! Indeed we DO produce motors... I had just to structure some PPT instructions for my friend... Well... it took me some time but he thanked me so... I think your help was ok! Thank you again. A.

Hello everybody, a customer of mine has asked me a clear explaination on how to connect a 6 cable Star Delta motor for a direct start-up. I know how to do it practically but I look for some clear instructions (with drawings?) that might maybe already be found on the net. Can you give me a...

Jbartos: me too but none due to contact welding! 99% of the causes of a fault in a CB make it so that the CB will not operate even before being installed, thus making it sure that if you install it and it works, it works ok. Another topic could be an electronic release where you can have a...

Sorry, I don't agree: with a trip free mechanism, the only risk of contact welding is for using an industrial CB at voltages lower than 24Vdc due to contact oxidation... I had no case of contact welding in 7y work in a CB producer...

Jbartos: sure still there are but they are very old (about 30y ago). New techniques use double interruption: 1. Rotation of two contacts 2. Two parallel contacts in a fork position 3. Two serial contacts in a standard execution Few producers have them. Each of them have advantages and...

I do agree on what you write but... what should you do if your fuses burn or if your CB trips while in the middle of the sea? Do you replace them or do you try to understand what happened by looking into the CB and look for the fault so that it does not happen again? This is the main point I...

Dear Jbartos, if you are talking about miniature CBs or MMS you are perfectly right. They usually cannot be opened without breaking them since they have no screws. As far as MCCBs or ACBs are concerned, the most important ones can all be opened (somtimes screws are very well hidden... e.g. look...

Dear buzzp, you are right: I was indeed thinking at water filled motors, not oil filled ones. They are indeed less known since they cost a little more due to different wiring. Thanks jbartos for the link. Technical consideration should be similar.

Naturally I did not want to start up a dilemma on fuses and CBs... that will always exist. Somebody up there said that CBs are complex. They surely are much more complex as a structure than fuses but let me tell you that the mechanical technology inside a CB is not complex at all. If we want...

My opinion is that fuses are the most convenient and cheap way of protection also taking into account that they really limit the peak of current but... I wouldn't say that a CB has a complex mechanism or, at least, a CB is structured in such a way that if it breaks it will open the 3 phases...

A submersible water filled motor must be checked and filled with water before use so that no air will be inside. At the startup a membrane will set according to pressure and the valve you take off to fill the motor will let surplus water out. This is the main job of the end membrane. If there...