Automatic transfer switch is a PC class infrequent change-over switch, with two-station design (commonly used for A and standby for B), suitable for AC systems with AC 50-60hz and rated current 6A-63A. The main function of the automatic transfer switch is when the main power (common power supply A) fails, the ATS automatically switch to the backup power (Backup power supply B) to continue working (switching speed Less than 50 milliseconds), which can effectively solve the troubles caused by power outages. When both A and B have electricity, priority is using A Power. NOTE: 1. Manual/automatic operation can the opening and closing performance of electrical operation, but in manual operation , there is no due to the different _opening/closing speeds of the operators. In manual operation, there's possible for excessive silver alloy loss . Therefore, the switch should only be pulled to the manual position after all power has been cut off for inspection and maintenance of the and contact information. 2. Normally, pull the switch to the electric position. When manual operation is required, pull the switch to the manual position. After manual operation is complete, pull the switch from the manual position to the automatic position. The control circuit is immediately energized. After the change over is completed, the internal switch damage the coil in the control circuit, and the coil can work normally at 85%-110% of the rated operating voltage. Too low input voltage may cause the coil to overheat and burn out. Attention! When manual operation the mode selection switch must be in "manual" position. Specification:4P Color:White Material:plastic Package Contents: 1 * Dual Power Automatic Transfer Switch 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.