415V 3 phase supply monitoring device has a 240V rated relay. Details inside. How to use?
Your problem is, when the coil circuit is without power the coil voltage drop is neglible. Because of that there is 415V across your relay terminals as soon the start button is pressed. It's not built for that and may draw an arc.

You could check if the coil can operate at 240V, and wire it between L3 and N instead of L3 and L1. If not, you have to use a different relay.