991120 Circuit Protection

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Circuit Breakers form a vital part of electrical systems and can be extremely important in protecting a facility’s electrical equipment from damage or fire. CircuitBreakers provide over-current protection by automatically turning off power to an overloaded circuit. The 991120 application field and its working principle are explained below.

Application Field and Working Principle

The 991120 is a two-pole thermal-magnetic combination circuit breaker. It is designed to protect circuits from overload and short circuit damage. This circuit breaker is perfect for many commercial, industrial, and institutional applications. It has an interruption rating of 10 kAIC at 120 volts AC along with an adjustable thermal trip. This breaker can be used in single and three phase panelboards up to 480 volts AC.

As mentioned earlier, this breaker provides both thermal and magnetic protection. The thermal protection is provided by the adjustable trip mechanism. This works by creating a current which is larger than the normal running current. The current activates an internal thermostat, melting and releasing the trip. This creates a disconnection of the power supply and prevents the circuit from continuing to draw current beyond its capacity.

On the magnetic side of the breaker, there is a movable contact arm. This arm is connected to an adjustable trip coil. When current increases beyond a certain level, the coil begins to magnetically attract the arm. This causes the arm to come into contact with another wire and short-circuit the circuit, thus cutting off the power supply. The current levels at which the thermal or magnetic tripping occurs can be adjusted.

The 991120 is a versatile breaker, and is constructed to the highest UL 489 standards. It is UL Listed for safety, and is constructed with high-grade copper materials. Additionally, this breaker has a Siemens rotating device on the top to make it easy to turn off or on manually.

Overall, the 991120 is an excellent circuit breaker for many applications. It is reliable, easy to install, and UL Listed for safety. This breaker provides both thermal and magnetic protection to keep circuits safe and prevent damage or fire. With its adjustable trip mechanism, it can easily be adjusted to suit the needs of any application. This makes the breaker perfect for any industrial, commercial, or institutional application.

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