Couldn't find the answer on the internet. The leads of VZ1 component are directly connected to mains.
The leads of VZ1 component are directly connected to mains.
Therefore in this context, the component which makes most sense is the varistor (often a Metal Oxide Varistor or MOV). [A normal Zener Diode, for which a designer might also use the
VZ component designator, would not be connected across the mains.]
Varistors are often used to suppress high-voltage transients and are directly connected across a device's mains supply input in that case.