Help with ID on this part. Might be varistor.

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I have what I think is a varistor. About a 5mm diameter disk, light
brown, glossy, burnt
around the upper edge. It is marked with the manufacturer(?) - CVN
Mexico - on one side and the other side marked


x60
X010


This may not be a varistor, maybe a capacitor or ?. It is in series
with a 15 ohm resistor feeding a relay coil marked 24VAC. The relay
coil burnt out as well as the resistor and this component. Any idea
what it is? Below is a layout of the circuit.


+VAC ------varistor(?)----15 ohm res.----switch------24vac relay
coil------ground