CHENZHU REPLY:

Our isolator only support 24V power supply.

At present, the main brand of isolator are only support 24V standard power supply, which could be easy replace, more safety and stable:

More Safety: 220V power supply isolator can not be maintained online ( risk of electric shock),  while 24V isolator module can be directly hot-swappable;

More Stable: If using 220V power supply isolator, there might be harmonics and cause interference to signal, which not easy to eliminate in such a thin housing.

In addtion, the swtich power supply is common used to transfer power it needs.