1、WORKING PRINCIPLE: When there is an abnormality in the normal power supply, the backup power supply immediately works and switches in milliseconds, ensuring the continuity, reliability, and security of the power supply. 2、2 OPERATION MODES: This transfer switch supports automatic and manual operation, and can be quickly switched to prevent power outage. Compact structure, reliable transmission, easy installation and maintenance. 3、DURABLE MATERIALS: The transfer switch shell is made of flame retardant PC plastic, with good insulation, high temperature resistance, and aging resistance. The silver contact greatly improves the conductivity and service life. 4、APPLICABLE PLACES: Suitable for emergency power system with a rated 50Hz AC voltage of 400V, suitable for various places where continuous power outages are not allowed, such as factories, shopping malls, nursery farms, etc. 5、CONVENIENT TO USE: AC400V 630A dual power automatic transfer switch with PC grade electromagnetic drive structure, suitable for household, commercial, and industrial use, features 4 pin screw installation, simple and convenient. 1 x Dual Power Transfer Switch2 x Rubber Pads1 x Manual Handle4 x Fuses Item Type: Dual Power Automatic Transfer SwitchModel: NLQ6-630/2PMaterial: PC Flame Retardant, Silver, RubberProduct Code: NARated Current: 630ARated Short Circuit Connecting Capacity: 17KARated Short Circuit Current: 10kARated Frequency: 50HzClass: PC ClassUsage Category: AC-33BStandard: GB/T 14048.11 IEC60947-6-1Product Size: Approx. 300 x 220 x 145mm / 11.8 x 8.7 x 5.7inInstallation Size: Approx. 282 x 200mm / 11.1 x 7.9in