The TRC 50 Amp Hardwire Surge Guard 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. Product Features: Automatic reset on power restoration. Multi-mode surge suppression. Automatically shuts off the power when the following is present: Open neutral. Low (<102 Volt) and High (>132 Volt) 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.