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A TVS is more practical and much cheaper. I still have PowerGuards I bought far back in the day for about $85 each. TVS[Transient Voltage Supressor] is actually better protection against voltage spikes for about 50 cents each.

PowerGuards shown in photo as well as a few TVS.

 

ps: if you are using a  TIU[track interface unit] for MTH DCS it has a TVS built in].

 

IMG_1782

 

IMG_2071-001

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Last edited by Dewey Trogdon

The spiking problem can occur with any transformer,regardless of age or design.  The old PW iron core type actually may be less prone than some modern ones.  This involves a lot of theory, more of a question for Dale Manquen or one of the engineers. The device being powered actually is what generates the spike. A solenoid or motor can be a big culprit but anything with inductance can generate a spike. 

 

Here is how I add a TVS and breaker

 

LINK

 

Dale H

 

 

 

Last edited by Dale H

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