Notes on different circuit locations of CB-level ATS

Automatic Transfer Switches (ATS) play a vital role in ensuring seamless and reliable power transmission during critical situations. Among the different types of ATS on the market, Class CB ATS stands out for its ability to connect, carry and break short-circuit currents while being equipped with an overcurrent release. This unique feature sets it apart from PC-class ATS, making it ideal for specific applications.

As with any electrical component, consideration must be given to the specific circuit location where a Class CB ATS will be installed. This is critical to ensure optimal performance and security. When a CB-level ATS is placed in a power distribution site, attention must be paid to the coordination of the main circuit breaker and the upper and lower level circuit breakers that make up the ATS. This coordination is necessary to prevent the ATS from being unable to switch after an overcurrent trip of the circuit breaker, resulting in a prolonged power outage to the load.

In addition, the operational short-circuit breaking capability (Ics) of the main switch MCB or MCCB constituting the Class CB ATS should also be carefully evaluated. This capability must exceed the expected short-circuit current of the circuit to prevent the switch from being unable to withstand the short-circuit current or failing to break in time.

The location of the load where a Class CB ATS is applied at the end of the circuit requires specific consideration. Here, the main switch of CB-level ATS is usually a miniature circuit breaker (MCB) or a molded case circuit breaker (MCCB). Applications in this location require attention to the specific needs and requirements of the load to ensure that the ATS can effectively handle power transfer without compromising safety or performance.

Overall, Class CB ATS provides a reliable and robust solution for critical power transmission applications. Its ability to connect, carry and break short-circuit currents, coupled with the necessary overcurrent protection, makes it ideal for a variety of circuit locations. By understanding and adhering to the specific considerations outlined for power distribution and load locations, Class CB ATS can be effectively integrated into electrical systems with confidence and peace of mind.