Is the 300V rating sufficient for (Line to line 440VAC) three-phase voltages, especially considering peak values?
Are the creepage and clearance distances provided by the 5.08mm pitch sufficient for safety and compliance with standards such as IEC and UL?
Additionally, if there are other factors I should consider or alternative connectors you recommend, I would greatly appreciate your insights. Thank you!
Three-phase tells us NOTHING about what you are proposing. The power for drones is three phase. The alternator in your automobile is three-phase. The commercial power to my former manufacturing business was 208 volts AC, three phase. The input to the transformers there was several thousand volts AC three phase.
All AC power is created three phase and distributed three phase. Only one phase is delivered to your home.
All AC power voltage is measured as the RMS voltage, meaning the equivalent to a steady DC power. The actual peak voltage is 1.414 times the rated voltage.
So you tell us what three-phase voltage you are concerned about and multiply it by 1.414 and that will be the peak voltage you will design for,
Then design for 622 volts, plus a safety factor you decide on. If the device being powered is reactive, such as a large motor, there will be all kinds of generated signals that can add or subtract from the 622 volts.
I have been looking for cost effective screw connectors, my purpose is to monitor the voltage of each phase in an industrial environment. It would be very helpful if you could recommend me suitable connectors which are typically used in Industrial voltage meters. Thanks.
If you're worried about the 0.5mm pin distance, then use a connector with more pins, and remove all the metal of each alternate terminal. That should be easy once you get the screw out.
Leo..
I am not sure how part manufacturers rate these things, I would think the rating is an RMS rating and the part can sustain the peak value of that RMS rating. I have never bought anything that shows a Peak voltage for a rating.
Regardless, you should buy something that has a rating equivalent to or higher than your expected highest voltage (RMS). Sure this would be fine for L-N or L-earth but I would not trust it for L-L … as for clearances, im sorry I can’t help but I can tell you I have connected equipment/devices with connectors similar(rated@600volts/3ph/xAmp) many times in my life and no issue.
I think the circuit board that the screw terminal is soldered on is the limiting factor. Standard spacing between pads/vias for screw terminal pins could be way too small for 600volt. That's why I suggested removing alternate pins of the screw terminal block, which of course only works if you also remove the vias in between.
Leo..
Let's get this all straightened out before someone gets killed or ends up in jail.
I can tell by your questions that you are not an electrician. Neither am I, but I have worked with electricians on many 3-phase projects in my factory. I have not installed any 3-phase equipment, but have dismantled many.
I don't know what country you are in, but in the United States, ONLY an electrician licensed for industrial high voltage can work on 3-phase systems. You will have to have a licensed electrician install any devices connected to such a power. The electrician will REQUIRE a proper switch to be connected to the 3-phase power and the output of the switch can be connected to your equipment.
I suggest you include proper fuses in the switch box so a fire does not start. The licensed electrician will not help not will he want to see or know what you are doing after the switch box.