I have just acquired a GS35B PSU. It is 3 phase and the schematics show 3 x NTC
thermistors in series with each primary. I presume that these are some kind of
soft start. I am not familiar with these devices but they make me
uncomfortable, I have always used a series resistor that is shunted by a relay
after a few seconds in the past. I do not have the model number of the devices
used as I will need to open the PSU to find out what they are but I assume that
they are similar to this device.
http://www.ametherm.com/datasheetspdf/MS325R020.pdf
The resistance varies depending on the load current and they get hot in order
to operate, this really puts me off. They have quite a long time constant so I
am uneasy about them altogether.
Should I be concerned and replacing them with a soft start for each phase?
Apart from that the PSU is very nicely made and will provide up to 1.6A@ 3600V.
Regards
Conrad PA5Y
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