Feature: 1. Excellent Designs: Adopting double row composite contacts, transverse pull structure, micro motor energy storage and microelectronic control technology, basically no arc. 2. Insulated Working: The load isolation actuating switch is equipped with a mechanical interlock device to ensure the reliable operation of the main and standby power supplies without mutual interference. 3. Better Protection: Clear switch position, padlock and other functions to realize the safe isolation of power supply and load. The switch has short circuit protection, overload protection, phase loss protection and undervoltage protection. 4. Wider Application: Electromechanical integration design, the switch can be used in families and public places, especially in office buildings and public places that need fire protection. 5. Simple to Install: Comes with a compact size and a light weight as well, the dual power automatic transfer switch is very convenient to install. Specification: Item Type: Dual Power Automatic Transfer Switch Model: SJCSQ2-250/4P Material: ABS, aluminum alloy. Rated Working Voltage: AC400V Control Voltage: 220V Rated Current: 250A Rated Insulation Voltage Ui: 750V Use Category: AC-33A Rated Power: 50HZ Breaking Capacity: icm 5KA Grade: CB. Package List: 1 x Dual Power Automatic Transfer Switch6 x Washer1 x Handle