The definition of ATS automatic transfer switch
ATS ATSE, for Automatic transfer Switching equipment is the English abbreviation, Chinese national standard called the automatic transfer switching equipment, commonly known as the double power automatic switch. ATS automatically converts the GB standard definition of switch is: by one (or several) switch electrical appliance and other essential electric appliances, for the detection of power supply circuit, when a path failure of the power source (overvoltage, undervoltage and lack of equal), the realization of switch apparatus of normal power supply and reserve power supply automatic conversion

The definition of STS static transfer switch
STS is Static Transfer
Switch is the English abbreviation, called the law standard and popular are static transfer switch. STS static transfer switch for power supply two choose a automatic switching system, under the normal working state of the main power in the voltage in the normal range, the load has been connected to the main power supply. When the main power failure, the load automatically switches to the backup power supply, a main power supply back to normal after the load is automatically switched to the main power supply. STS static transfer switch by switching the BBM, can realize continuous switching between different input power, provide double bus power supply for the single power supply load.

The difference between the ATS automatic transfer switch and STS static transfer switch
The ATS switch is a mechanical structure, a circuit breaker, load isolation switch or authoritarian body to execute switching components, realize automatic switching power supply of the two power driven by a motor and the manner in which the electromagnetic drive, motor drive type double power supply because of its complex structure, the reliability is the electromagnetic drive type double power supply automatic transfer switch is low, ATS generally used in high load conversion, the conversion time is relatively long, motor drive type double power supply to more than 1.5S, the electromagnetic drive type double power supply the fastest can reach 80ms.
STS static transfer switch for electronic circuit structure, by the intelligent control board, high speed SCR, breaker form. With the traditional ATS automatic transfer switch compared, STS static transfer switch switching speed reaches the millisecond (less than 8ms), to provide rapid load transfer (usually 1/4 cycle), uninterrupted switching circuit can be realized, will not cause the IT class load power. Both the load and reliability of power supply, but also guarantee the safety of STS in different phase when switching power supply.
Comparison of using current range (conventional use, the market non special): ATS (below 3200A), STS (below 1000A)
Volume comparison: ATS is STS larger volume, and the need to configure the controller.
Conversion speed comparison: STS 3-8ms ATS the shortest, fastest conversion time can reach 80ms-1.5S
Price comparison: STS prices more expensive than ATS
The user can use the occasion of reasonable selection of specific use ATS automatic transfer switch and STS static transfer switch.