We have an older version of this one from TRCI - but ours is somewhat different than this one - I think they are all basically the same and do the same thing with slight variations - ours does not have a display but does have idiot lights - ours has a key switch that allows us to turn it off - I believe ours being an older model has a cutoff of 108 instead of the 102 this one shows - I thought the standard was 10% above or below the desired 120 - which would give us the 108 and 132 - guess they changed things. I use a simple hand held device to check the pedestal before I ever pull into the space.
50A Hardwire - Model 34560
120/240V, 50A - 3850 Joules!
Now with optional Remote Power Monitor LCD Display!
This 50 amp Surge Guard product monitors shore power continuously and shuts off when it detects excessive voltage or open neutral conditions that could damage electronic equipment in your coach. Like its 30 amp partner, the 50 amp hardwire unit is permanently installed within the bay of your coach, preventing potential theft and damage from the elements. Optional Remote LCD Display conveniently and remotely monitors RV electrical power. Additional model 34560 features include:
http://trci.net/products/surge-guard-rv/hardwires-portables/50a-hardwire
Automatic reset on power restoration.
Multi-mode surge suppression
Automatically shuts off the power when the following is present:
Open neutral
Low (below 102V) and High (above 132V) Voltage
Reverse polarity
Caution indicator light indicates:
Miswired pedestal
Reverse polarity
Elevated ground voltage
128 second reset delay protects A/C compressor.
3850 Joules of power surge protection.
Easy installation
Optional Remote Power Monitor LCD Display, p/n 40298, (sold separately)
Plugs into remote port on Surge Guard model 34560-004 (see above)
Not compatible with previous models that do not have a telecom jack.
16 Detailed Fault Screens
Joystick for easy screen navigation
Plug and Play (cable included)