209-1-21305-1

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Circuit Breakers

A circuit breaker is an electrical device used to automatically interrupt an electrical circuit when the current exceeds a predetermined value. The 209-1-21305-1 circuit breaker is an example of an integral trip molded-case circuit breaker with an adjustable current setting range of 300-1200A. It is commonly used in electrical power distribution systems to protect against overloads and short circuits.

Application Field

The 209-1-21305-1 is designed for use in commercial and industrial applications such as office buildings, factories, hospitals, and other large buildings. It is also suitable for use in medium voltage distribution systems. The device is capable of interrupting currents up to 75,000 amps and is UL listed for a maximum operating voltage of 600VAC. This makes the device suitable for use in a wide range of applications such as power distribution, motor control, electromechanical protection, and low resistance grounding.

Working Principle

A 209-1-21305-1 circuit breaker operates on the principle of thermal-magnetic tripping. In this system, a ribbon of bimetallic material is used to sense the current flowing through the circuit. As the current increases, the ribbon heats up and bends, opening the circuit automatically to prevent overloads or short circuits. The mechanism also includes a magnetic element that is activated when there is an extremely high current, such as in a short circuit. The magnetic element triggers a trip mechanism that quickly closes the contacts.

The 209-1-21305-1 circuit breaker has a number of features that make it an attractive choice for many applications. For example, it has an adjustable current setting range of 300-1200A which makes it a good choice for applications with a variety of power requirements. Additionally, it has a wide range of interrupt rates, meaning it can be used in a wide variety of applications. Finally, the device has a low instantaneous tripping current rating making it suitable for use in applications with low inrush current.

The 209-1-21305-1 circuit breaker is a reliable and effective device that is used in a variety of applications. With its adjustable current setting range, wide range of interrupt rates, and low inrush rating, the device is a safe and reliable choice for many different applications. It is a reliable and effective device that is sure to provide years of reliable service.

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