Motor switches will be available for as long as we wish to switch on motors. The actual model of switch you have may be obsolete but you can get something similar to do the job.
Just make sure that the current rating of the motor is nicely in the centre of the range of the thermal overload switch that you buy and that the contactor coil is designed for 240v operation (even if the switch says it is good for 415v)
My current favoured supplier is
Dol starter 1 phase 230v or 3 phase 400volt coil, Electric motor overload fitted | eBay
you can choose which overload switch rating you need.