ClarytyHD Model 1 Power block : HYS3C300-CS, Varistor (VR1) destroyed

[asphy]

Hi everyone,
This is my first thread and here are few words to introduce myself. I consider myself equiped with only some theoretical knowledge in electronics as I thought courses in General Physics for many years.
I got a ClarytyHD Model 1 and the varistor (VR 1) in my power block HYS3C300-CS has been destroyed and no specifications can be retrieved. ( it is on the right side of 4 rectifier diodes)
Did many attempts to get schematics for ClarytyHD Model 1 but without success .
Does anyone know the specs of the varistor so I can replace it? I found this image in diyaudio forum so mine looks exactly the same.
Any help is appreciated.
Thanks

 

[JonSnell Electronic]

You need one of these; https://uk.rs-online.com/web/p/thermistor-ics/2161387

It is an NTC thermistor. 1 OHM when cold.
They regularly fail and are used in many power supplies, especially Chinesium ones.

 

[asphy]

Hi JonSnell Electronic,
thank for your replay. Here it is the damaged component-may be the image can tell more than I do.

 

[JonSnell Electronic]

A common cause is poor mains connection, loose wiring in plugtops etc.
The main cause is the circuit design.

 

[Capt Grogg]

If it is across ac line it is a varistor for over voltage protection .

 

[asphy]

Thanks Cap Cragg,
Would you have in mind a safe value for the varistor to start as there may exist other bed components?