mikb55:
Does anyone run their current sensors at the max allowed current without adding heat sinking?
I have the 20A version which quotes 1.2 mOhm as the loop resistance. At 20A that is half a watt of heat coming out of a tiny 8 pin SOIC package. All the current is carried by the four pins on one side.My lab supply only goes up to 4A so I don't have a way of testing the real-world behaviour until I connect it to the actual thing I want to measure.
The module is the typical thing you see on ebay or Aliexpress.
What you may not realize is that the terminal block and the wires you screw into it are acting as heatsinks.
Its probably fine for 20A.