
1. Progressive Industries EMS-PT30X
Progressive Industries
$235–$290
The go-to full EMS for the 30-amp majority: complete over/under-voltage shutoff, miswire and open-neutral protection, a scrolling diagnostic display, and a lifetime warranty, at a price well under the flagship smart units.
Best for: 30-amp travel trailer and Class C owners who want set-and-forget full EMS protection
Full EMS protection: disconnects on low/high voltage, open ground/neutral, reverse polarity, and accidental 240V · 1,790 joules with 44,000A max spike rating and sub-nanosecond response · Scrolling display shows voltage, amperage, frequency, and plain error codes · Lifetime warranty and a long track record with full-time RVers
Weather sealing is its weak point, owners report moisture intrusion if left exposed in heavy rain without the shield oriented correctly · No Bluetooth or app monitoring · Surge module isn't user-replaceable
Sources: amazon.com, rvoutfitting.com, weretherussos.com, progressiveindustries.net, homedepot.com























