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Commercial and Industrial ElectricalDiscussions on Three Phase, Motors, Trunking, electronics and other industrial electrics
my understanding 51 using for overcurrent protection, but the reason of overcurrent is overload, 49 is thermal relay and the reason is overload too. So, can I use one of them for overload protection? when do I use both ?
51 & 49 function relay 
Re: 51 & 49 function relay 
Linear Mode
