ATSE automatic transfer switches (commonly known as dual power automatic transfer switch) and two as an important guarantee a continuous supply of electrical switches load, low-voltage switchgear and control equipment is an important component in the category in the country although it is a new product, but in the Europe and the United States has more than 100 years of history, in 2002 our country has also developed a dual power corresponding national standard GB / T14048.11,CQC certification corresponding type tests in order to verify both a switch (or device) ATSE can meet the requirements of the previous two contactors by interlocking control circuit consists of dual power switch is not consistent with the CQC ATSE type test certification should not be used as (or instead of) ATSE use, but because of its low price, there are many owners, construction units and switch factory willing to adopt, institute should be a good product performance and quality requirements that hurdle, responsible for project quality and should be persuaded to stop and do the work.

ATSE automatic transfer switch as important to ensure continuous power supply load switch electric appliance, auto detection in case of power failure and indicator switch, to ensure continuous power supply the important load, while ATSE IEC and GB standard in PC level and CB level of the points, but people still think, ATSE should not be because action causes power failure outside, CB grade products will be overloaded and tripping, so ATSE should use only the PC class, American UL standard although it allows the CB class ATSE uses, but the requirement of the product (or design) should be clearly marked "a warning if the electrical current release, ATSE will not convert". At the same time, because the PC level ATSE level distribution protection, less than the CB level ATSE therefore, grade PC ATSE than CB grade ATSE in meet the selective distribution lines with more advantages. Now the Chinese market PC grade and CB grade ATSE price almost, if not the price considerations, choose PC ATSE for power conversion more are more reliable.

ATSE automatic transfer switch is typically power conversion in continuous load operation conditions, on the excitation current of the motor load, the conversion of the instantaneous impact current is much higher than the rated current, so the ability to switch with ATSE load is particularly important, and dual power supply manufacturers and designers usually have not paid enough attention, ATSE long use the left the accident hidden danger. Based on this, the GB / T14048.11 specified ATSE use category, designers in the design documents must be clearly marked use categories. The CB dual power supply, may be due to the rated tripping current switching over circuit breaker instantaneous impact current, causing the breaking caused by two power supply is off power, although it is theoretically possible to avoid this problem by increasing the rated current, but the cost will rise, at the same time the distribution line with selectivity is also more difficult to achieve.

Close paragraph of time, reduce the quadrupole switch using opinions more and more, but the automatic transfer switch for ATSE, using quadrupole"s situation is more than the use of pole, for example, different positions of a building in two substation, grounding line of N is very difficult to achieve the same point grounding. If the triode ATSE, then the current N line will split, loop is formed between the ground in different N line, the electromagnetic interference problems will then face; even two substation N line at one point grounding, N line current of a power distribution circuit will be diverted in two low pressure system fire leakage monitoring system, the new "high regulation" required in the relevant distribution circuit can work normally? We should improve the reliability of ATSE quadrupole products N electrode.

The PC level of ATSE automatic transfer switch installed electrical protection issue, I personally think that this is a low voltage power distribution protection problem, and is not directly related to ATSE, ATSE is viewed as a cable, the equipment, how to install the protective appliances, according to design specification "(" low voltage distribution can be executed.