I need to switch a relay 60 metres away from the point of supply it must be rated to power the relay coil 24/7 if it is left switched on.

The output is 12 VDC, but I thought of using a relay and a 48 power supply, to boost the power to 48 VDC.

I found this:

This also got me thinking about all these cat 5e and cat cables in the same wireway as the power cables used for the CT.

Peak operating voltage max. 90 V
Voltage UL/CSA 300 V
Testing voltage core/core 2000 V core/screen 2000 V
Min. bending radius fixed laying: 5 x d flexible application: 10 x d continuously flexible: 15 x d
Temperature range VDE VDE fixed laying: -40°C/+70°C VDE flexible application: -40°C/+70°C UL: up to + 80°C