Dear Sanjit Dutta ,

The higher current is achieved by increasing the current carrying area of the transistor in addition to effective cooling of the transistor.

One penalty is the price of the transistor.

Other wise the operation of the transistor will at low current will be more comfortable to the transistor since its temperature will be lower.

So t he transistor will live longer.

As for the switching speed it may be smaller in the low current than if one uses smaller area transistor since the area increase will increase the parasitic capacitance. But you can yourself see the the effect of the temperature on the operation of the transistors since you have different transistor types that may have different behavior to the temperature rise.

In summary operating transistors at lower current will be favorable for them.

Best wishes.

Dear Sanjit Dutta ,

I do not think it is required that the transistor has higher switching speed at the lower current than at the higher current. My opinion is the transistor well operate well also at the lower current.

Best wishes

My opinion is that by using high current rated power electronic switching devices in a lighter load conditions, the following can be allowed:

(1) Heat generated will be minimum, so installation of fans may be jettisoned.

(2) No need for an elaborate heat sink or anyone with fair thermal resistance can be engaged.

(3). Cable insullation thickness can be compromised.

(4). Conductor csa will be sized based on the load.

(5) Numbers of parallel connected MOSFET can be reduced.