The Surge Guard 34951 provides total electrical protection for your 50-amp RV, including protection against wiring issues; reverse polarity, open neutral and open ground. Also protects against low/high voltage, low/high frequency and elevated ground line current. Includes patent-pending Load Side Open Neutral Protection that detects and protects your RV from the catastrophic results of an open neutral in a 50-amp RV electrical system. Ten-second start-up sequence and 128 second fault delay sequence protect compressor motors against damage. Works with Surge Guard Wireless LCD Display (sold separately). A security ring on the cord lets you lock the Surge Guard to prevent theft. Comes with Southwire's Limited Lifetime Warranty with Connected Equipment Coverage. The model 34951 replaces the 34950 model.