Feature: 1. [High Performance] Transfer switch adopts double row composite contacts, transverse pull structure, micro motor advanced energy storage and microelectronic control technology, could basically realize zero arcing. 2. [4 Operation Modes] Power transfer switch has emergency manual, electric remote control, emergency disconnection under automatic control, and automatic control operation modes, more reliable. 3. [Mechanical Interlock] The transfer switch is equipped with a mechanical interlock device to ensure the reliable operation of the main and standby power supplies without mutual interference. 4. [Safety Design] With switch position indication, padlock, achieve safe isolation of power supply and load, support multiple protection functions, including short circuit, overload, phase loss and undervoltage, highly safe. 5. [Wide Application] The switch can be used in home and public places, especially in office buildings and public places that need fire protection. Specification: Item Type: Dual Power Automatic Transfer Switch Material: ABS, Aluminum Alloy Model: SJCSQ5 250 4P Rated Working Voltage: AC400V Control Voltage: 220V Rated Working Current: 250A Rated Insulation Voltage Ui: 750V Rated Limited Short Circuit Current Uimp: 70KV Rated Short Time Withstand Current: 9kA Use Category: AC 33B Rated Production Capacity: 10Ie Rated Breaking Capacity: 8Ie Rated Power: 50HZ Grade: pc Working Temperature: -20?? to 45?? (the average value in 24 hours should not exceed 35??) Working Humidity: The average humidity at 40?? shall not exceed 50% and shall not be dewed. Package List: 1 x Dual Power Automatic Transfer Switch1 x Handle2 x Key12 x Bolt12 x Nut