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We asked the question to Keystone directly and they confirmed that the Legacy package includes Progressive Dynamics 50 AMP automatic transfer switch high voltage Surge Protection Model PD52DCSD with remote display.
They replied...’All of PDI’s transfer switch have an onboard management system or EMS. Fluctuations in voltages are a common problem in electrical devices and have to be protected from those fluctuations. Once those fluctuations move beyond the EMS standard threshold, be it too much voltage or not enough voltage buffering of the voltage takes place. This buffing also has a limit and beyond that limit is what the surge protection is for.
I hope this has been helpful.’
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