Air Circuit Breaker Ratings Chart

If you are an electrical engineer, then you know how important air circuit breaker ratings can be. This type of breaker is designed to protect electrical systems from overvoltage and overcurrent, the two main causes of power outages. The ratings for air circuit breakers are given in an air circuit breaker ratings chart. Understanding these ratings can help ensure that the right size and type of breaker is being used for a specific electrical system.

The air circuit breaker ratings chart is comprised of three major factors; voltage, amperage, and interrupting current. Voltage ratings are given as a multiple of the normal operating voltage of the circuit, such as 5 times the normal operating voltage. This rating lets you know the maximum voltage for which the circuit breaker was designed. Amperage ratings indicate the maximum current the breaker is designed to carry, expressed in amps. Interrupting current ratings tell you how much current the breaker can safely interrupt without causing damage to the system.

When selecting a breaker for a given system, it’s important to select one with a voltage rating equal to or greater than the maximum operating voltage of the system, an amperage rating equal to or greater than the maximum current draw of the system, and an interrupting current rating equal to or greater than the peak current your system can experience. In addition, air circuit breakers must meet certain standards set forth by the National Electric Code (NEC).

The air circuit breaker ratings chart is essential for every electrical engineer’s toolbox, helping to ensure the right breaker is selected for a given system. Using the right size and type of breaker helps keep electrical systems safe and operational. Knowing how to properly read, interpret, and utilize an air circuit breaker ratings chart is key to any good electrical engineer’s success.

How To Calculate Subpanel Loads