They make all kinds of relays and a lot of electric forklifts use them to switch their motors. I ordered a used one from Ebay for testing. 35€. The good thing is that they are made in the UK. Heavy duty and also heavy weight, but rated for high currents and voltages.
They don’t have Anti-Spark, but I think we could add a resistor to the contactor. If not, we could add an auxiliary relay just for antispark. The Arduino that controlls this will then connect the antispark before the main relay is connected and then disconnect it again.