2P ground wiring for surge protection, 4P three phase four wire solve three phase unbalance Local manual setting on device (no need WiFi support) Auto-reclosing after protected conditions recovery Timing schedule programmable on App Device sharing among family or Functional features: 01. Four options on control: Remote control anytime anywhere (mobile app, Tuya Smart, Smart Life) Voice control (AI speaker, Alexa, , ...) Timing control (programmable Schedule) Manual control (by keys and handle) 02. Monitor real-time electricity consumption and statistics on phone (A, V, mA, kW, kW/h, ℃) 03. Prepaid metering mode available as option by switch; 04. Adjustable protections against over/under voltage, overcurrent, residual current(leakage), high temperature; 05. Overcurrent protection: 1-63A/100A adjustable, 63A as default; 06. Over voltage protection: 250-400V adjustable, 275V as default; 07. Under voltage protection: 90-210V adjustable, 110V as default; 08. Residual current(leakage) protection: 10-100mA adjustable, 50mA as default; 09. Alarm temperature protection: 50-90℃ adjustable, 60℃ as default; 10. temperature protection: 60-100℃ adjustable, 70℃ as default; 11. Recovery on-delay time: 5-90s adjustable, 30s as default (manual setting on device by keys, not in app); Note: If the protector trips 3 times due to leakage, it will not auto-reclosing until the fault fixed by user to ! Colour:As Shown Material:ABS Package Contents: 1 * Under Voltage Protector Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.