Hi!

Does anyone know why the plate broke like that and if there's
some place I can get a replacement for it? They are
standardized, no? *:-)

It was probably heat related damage. These plates can get very hot
while the microwave is in operation.

The plate itself is pretty well standardized. There are only so many
ways to make a round glass plate, after all. :-)

What will be different between microwave makers is the way the plate
is gripped by the turntable mechanism. There are usually some lumps of
formed glass made into the bottom of the glass that are caught and
driven by a simple gear.

A good appliance parts house should have the part, but the
manufacturer should be contacted first.

William