I have been using DPDT relays to control high-current loads (~15 A at 240 Vrms) though I am only using them in a SPST, NO fashion; that is, the load is disconnected when the coil is de-energized, and vice versa. A supplier has offered DPST parts that basically remove the unused NC contacts (top two on the image below).
The copper pour (blue) is on the top and bottom layers in 2 oz copper as well as two inner layers in 1 oz copper.
Is there a benefit of keeping these DPDT relays around despite the unused contacts, or would thermal vias do just as well to keep the PCB trace temp rise down?
Best Answer
The heat dissipation is well taken care according to the copper thickness you have mentioned. Considering the 330 mils trace width, the temperature rise for a 1 inch trace is not more than 10 degrees which is really acceptable. The PCB trace width is perfectly fine.
I would only suggest to use more number of vias on either end of the traces where you connect the traces together from all the layers.
Yes. If you have no problem retaining them, keep it as is. One fine day,itmay be helpful to you. Think of the present supplier not supplying the items any more or chance of using a cheaper DPDT switch from another project.