I have to do a connector adapter, that has to handle 5A current, from a pwm motor driving circuit(power mosfet), to the motor. I have not found the current rating for dupont connectors
It is possibile to use them for a prototype connection or it is dangerous? Thanks
I think those cables are 26AWG (American wire gauge).
You can use an online calculator to get the AWG you need, depending the Voltage, Amperage and length.
Buy your connectors from a supplier which provides the specs for it, then you'll know the current rating. Example: Dupont 2.54 mm pitch connector, rated for 3A AC or DC. Using no-name parts without any specs is asking for all kinds of surprises.
BTW, I have never seen Dupont connectors rated for more than 3A. I know it's impossible to prove a negative, but it's very unlikely the pins you've got can handle 5A.
As a rule of thumb you can pull 3A through such a connector. It is very hard to find current ratings for 0.1"/2.54mm dupont connectors in most datasheets, some do specify one though, eg: http://www.molex.com/webdocs/datasheets/pdf/en-us/0901200121_PCB_HEADERS.pdf
However I have certainly seen poor examples of these connectors, usually the pins, which I would not rely on for even 3A.
To address your question "is it dangerous", you could certainly try this as a prototype, but you should never leave the device unattended. You may also see lower current consumption in such a prototype compared to the final design due to the extra resistance in the connection.
Most of the connector I have found are only 2.5Amp, but for safety it should be derated a bit depending how much overall power is going through it.
