Main purpose: STQ2 series dual power switching device (hereinafter referred to as the device); suitable for AC 50Hz, rated voltage 690V and below the two-way power (common source and backup power), an exception to switch between the power supply due to the way of a power dual power switch OEM processing, and ensure the reliability and security of supply. Structure: STQ2 dual power automatic switching device is composed of two parts, the main body and automatic controller, and between the two 2m long with special cables. Device body (hereinafter referred to as device) by circuit breakers and accessories (auxiliary, alarm contacts) Two CDM3 electric operation, mechanical interlocking mechanism, circuit breakers and other components. All devices are mounted on a metal chassis, mechanical interlocking mechanism mounted between the two circuit breakers. Principle: automatic voltage controller for simultaneous two-way power detection, when the supply voltage is higher than 110% of nominal sentence for overvoltage; undervoltage when sentenced to less than 85% of rated voltage. The internal circuitry of the test results to judge and make a deal, and then issue commands to the closing or opening the instruction relay electric operating agencies, and executed by electric operating agencies. After the automatic controller for two-phase power supply for testing, the test results of each phase with the indicator displayed on the control panel, respectively. Automatic control by control functions can be divided into automatic recovery (R), since the vote of no self-recovery (S) and the grid - generator (F) are three former two each applicable grid - grid power supply system. Duplex vote since automatic controller (SGQ2R) STQ2R used for automatic switching between power and standby power. But when the normal power supply back to normal; peacetime TCL by the common power supply dual power switch, an exception occurs when the normal power supply (any one phase voltage overvoltage, undervoltage or phase), the appropriate time delay switch to the backup power supply dual power switch, then they automatically return switched to the common power supply. When the standby power supply is abnormal, the controller sends an alarm sound, the user is prompted Standby power is now an exception, must be repaired immediately, the alarm sound can be artificially closed. Dual power automatic transfer switch domestic and international standards dual power automatic transfer switch IEC60947-6-1 relevant international standards and national standards GB / T14048.11 have relevant personnel are aware of the criteria necessary to automatically switch to the requirements and constraints of ATSE selection and use. However, considering the many practical engineering and construction can meet the requirements of a given load, this paper, the application of practical engineering analysis. Combined with the actual number of specific projects and the load on this issue by listing a number of practical projects often encountered, for the selection of ATSE be breaking capacity on points - short-circuit withstand capacity in the power supply system, the short-circuit current is inevitable, so When selecting an electrical switch, short-circuit current and its impact must be considered, for the PC level ATS, load switch, disconnecting switch, AC contactor, which do not have the protection of the switch, the case of short-circuit failure, which, fuses action resection short-circuit current. So they do not have their own protective function switch in the choice, not only to consider their rated values ??Changshu dual power switch, prospective, the short-circuit withstand capacity includes the "tolerance time" and "current tolerance" of these two The concept, which is in a long time but we know that when the current through a conductor is to heat, does not consider the current changes brought about by electromagnetic effects (dynamic stability), the general switch burned square of the current flowing through a conductor and proportional to the time, the role of the conductor current increases, the longer, the more heat generated. If we want to switch the melting point, or shortening the time t. In theory, increase the melting point of the switch is to choose a high melting point metal (e.g., gold, tungsten, silicon alloys, etc.) make contact, increasing the cost of the switch and a touch switch and a plus increased size of the switch, and a high melting point alloy technology for foreign companies are confidential, so it is not easy to achieve. Reduction off the circuit breaker or fuse and other considerations fast. Dual power switch OEM processing | dual power switch | Thai Industries ended only by the Thai Industrial Co., Ltd. Shanghai Branch Yueqing offer. Shanghai only Thai Industrial Co., Ltd. Yueqing Branch (www.cnats.cc) strong, credible, in Wenzhou, Zhejiang switch industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead only Thai Industries and you hand into the brilliant, for a better future!