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What kind of Contactors are used in DC Fast charging Stations?
Please correct me if I am wrong, I believe we need the utilization category of DC-13 for DC Fast charging.
Rated current -125A, Rated Voltage -120Vdc
I have seen companies using DC-1 utilization for the same like Dongya, TE, Little Fuse.
Are these okay for DC switching?
Assuming 16 closing and opening Contactor operation in a day with current as much as 125A, 120VDC
Should we look for contactors of DC-1 utilization instead of DC-13.
Any opinions on this one? Kindly share with some technical details.
Also generally what should be the ideal Making and Breaking capacity for Contactors for EV Charging.
As per IEC -60947-5 it should be same as Rated current for DC-13 Catagory.
Appreciate the advice.
Recalling that DC1 is for resistive loads, and DC13 is really for things with undamped stored magnetic energy like solenoids in scrap yards, where there may be a big back EMF on disconnection. There are inductors in a car charger, but they are not the main energy storage component. To make a charger appear as a DC1 class load or better should be possible, especially with carefully chosen subbing circuits to absorb transients.
However, it may have to survive a few of the malfunction events in its lifetime, so to have a bit in hand is always good practice.
It may not be so relevant but there is also a very large background of experience for train traction systems at levels in the 750-900V range, and designs of components such as switches, interlocked connectors and contactors that suit this are available and understood.