What are automatic transfer switch types?

Automatic transfer switch types can be divided into many types according to their applications and functions. This article will introduce the automatic transfer switch types in details.

Automatic transfer switches, namely ATS. It is mainly suitable for emergency power supply systems with rated voltage AC not exceeding 1000V or DC not exceeding 1500V, interrupting power supply to the load during power conversion.

1. Automatic transfer switch types – Classification according to operation method

Manual ATS: Manual ATS requires manual intervention by the operator for switching. When primary power fails, operators must manually switch to backup power. This type of ATS is typically used in applications that require low-cost backup power and do not require high continuity of power switching.

Automatic ATS: Automatic ATS can automatically switch to the backup power supply when a main power failure is detected without operator intervention. This type of ATS is often used in critical applications that require high power supply continuity, such as medical facilities and data centers.

2. Automatic transfer switch types – Classification according to switching speed

Instantaneous ATS: Instantaneous ATS can complete power switching within milliseconds, ensuring imperceptible switching of power supply. This is important for applications where power switching times are extremely critical, such as computer servers and communication base stations.

Delayed ATS: Delayed ATS will have a certain delay time before switching power. This delay can be used to detect momentary fluctuations in the mains supply to avoid unnecessary switching. Time-delay ATS is typically used in applications that require more stability against power supply fluctuations.

3. Automatic transfer switch types – Classification based on number of poles

Unipolar ATS: Unipolar ATS can only switch one power conductor, usually the phase conductor. This type of ATS is suitable for simple applications such as residential buildings where only one phase of the mains supplies needs to be switched.

Multipole ATS: Multipole ATS can switch multiple power conductors, including phase, neutral, and ground wires. They are often used in more complex applications such as industrial and commercial buildings to ensure comprehensive power switching.

4. Automatic transfer switch types – Classification according to the number of power supplies

Dual power supply ATS: Dual power supply ATS can only switch between main power supply and backup power supply. They are suitable for some simpler applications where only switching to a backup power source is required in the event of a main power failure.

Multi-power ATS: Multi-power ATS can switch multiple backup power sources to increase redundancy and reliability. This is important for applications that require multiple backup power sources, such as data centers.

Different automatic transfer switch types are suitable for different applications. According to specific needs and power supply requirements, selecting the appropriate type of ATS can ensure the reliability and continuity of power supply. Whether it is a simple residential or complex industrial application, ATS plays a critical role in ensuring the normal operation of equipment and systems during power failures.

Related Articles


What Is the MCCB Application

The MCCB application (Molded Case Circuit Breaker Application) is various. This article will introduce the MCCB applications from 4 different aspects. MCCB Application – Residential,

Read More »