3.1Ambient temperature: -20″C – +40″C; 24hours average not more than +35″C;
3.2Atmospheric conditions: humidity not more than 50% at max. +40″C, higher humidity is allowed at lower temperature, at most wet month, the average max humidity is 90% at the average min temperature +25″C, and have considered the condensation on the product surface due to temperature variation.
3.3Altitude: not more than 2000m;
3.4Pollution class: the installation site environment pollution Class 3.

7.1High short time withstand capacity, high short circuit making capacity
Adopt high density silver alloy contact, can withstand thousands operating cycles and no burning loss, no pit or no melting. No need daily contact maintenance, 100% rated current continues load. Contact system adopt bridge type double break rotating insert structure, reach high short time withstand capacity and high short circuit making capacity, no need special SCPO, no affect the selective of circuit, meanwhile also can meet the application in the big capacity power supply system.
7.210Ie making and breaking capacity, match the AC-338 utilization category
Optimized magnetic blow-out arc extinguish system, easily reach 10le making and breaking capacity, match AC-33B utilization category and also match the load property of AC typical application of GB/T14048.11 standard, have wide application range.
7.3Stacking structure, small volume
Main, backup power switch part adopt modular design, stacking arrangement, make the product volume more smaller than other similar products.
7.4Three position with isolation lock
With “Main power position”, “OFF position”, “Backup power position” three working position, can used for fire linkage and high inductive impedance load; OFF position with isolation lock function, can meet the isolation requirement during the load side maintenance.
7.5Display controller can integrated installation, also can split installation
Display controller and transfer controller split set up, display controller can install on the switch body panel (integrated type), also can install separately on the door panel of switchgear box (split type), convenient for user to check and control of the ATS status.
7.6Multi-functions, different modes
Controller have under-voltage, over-voltage, phase missing automatic transfer function and motor-driven forced transfer function, Auto mode have auto transfer with auto recovery and auto transfer without recovery two modes, to fit with different location; Have fire linkage function, to
cutoff the load power under emergency situation.

8.1Under-voltage detection
Controller makes under-voltage detection for main power and backup power, when the under-voltage is detected with the power supply, it will start the auto transfer function to transfer to another power supply. When the power supply voltage is detected recovered to acceptable range (recovery value), controller will decide whether make transfer according to the setting transfer mode and also can set transfer delay time.
8.2Over-voltage detection
Controller makes over-voltage detection for main power and backup power, when the over-voltage is detected with the power supply, it will start the auto transfer function to transfer to another power supply. When the power supply voltage is detected recovered to accept
-able range (recovery value), controller will decide whether make transfer according to the setting transfer mode and also can set transfer delay time.
8.3Transfer delay
When the main power is confirmed abnormal and backup normal, transfer delay start delay counting, after time delay is over then transfer from the main power to backup power. This time delay can wait to confirm whether the main power is short time abnormal, also can avoid switch frequently transfer.
8.4Recovery delay
Recovery delay is after backup power supply, and main power is confirmed available, then start delay counting, when delay time is over then transfer from the backup power to main power. This delay time can wait the main power supply output stable before it supply to the load.
8.5Generator start delay
Generator start delay can avoid starting genset due to short time power off. When main power fault then start delay counting, and after the delay time is over then send generator start signal. (Note: when the main power suddenly cutoff and genset didn’t start, under this situation it can’t delay due to no power supply to the controller, if need to use this function have to connect a DC24V aux. power supply to the controller to achieve the time delay function)
8.6Generator stop delay
Generator stop delay can remain the generator in hot backup status after it stop power supply to the load, avoid the genset restarting due to main power in short time recovery. When transfer from the backup power to main power supply then start the delay counting, after delay time counting is over then controller send genset stop signal.