If you want something easy to recognize, the LK-61644 has you covered with its distinct and visible name.
One (1x) Airpax Circuit Breaker IEG6-1-62-40.0-01-V 250V 40A -1 Pole – ON/OFF
You will find that the BU1 AC handles routine switching jobs cleanly, without any confusing setup.
A nice touch is that it's led compatible, so you can match your panel's look withI appreciate that it's led compatible, and it keeps the wiring simple for small indicator setups.