991206

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Circuit Breakers

A circuit breaker is an electrical device designed to protect an electrical circuit from damage caused by excessive current, usually resulting from an overload or short circuit. Circuit breakers are an essential element of any electrical system, providing overload protection and preventing overloads or short circuits from causing potentially catastrophic damage. They are also used to isolate malfunctioning parts of an electrical circuit in order to avoid further disruption of the system.

991206 Application Field and Working Principle

The 991206 circuit breaker is used in the majority of residential, commercial and industrial applications. It is typically employed as an overload protection device, allowing for applications such as fuse replacement and reverse-feed protection in series. The 991206 is a three-pole breaker with a thermal-magnetic operating method. This means that in the event of an overload situation, the bimetallic element within the breaker will heat up due to high current. When the current reaches a particular level, the bimetallic element will snap open the contacts of the breaker, thus interrupting the electrical circuit and the flow of current.

In addition to providing overcurrent protection, the breaker has the feature of an adjustable trip unit set that allows for the adjustment of the current-sensing trip level. This feature is useful for preventing nuisance trips due to short-term high current conditions, allowing for a temperate response before the breaker trips and interrupts the current. Different applications will require adjustment of the trip settings on the breaker, such as in motors that have high inrush current.

Since the breaker includes three-pole operation, it permits a wide range of appliances to be protected. This can be a single device such as a washing machine, two devices connected together, or a three-phase application such as a larger motor start-up. Different sensitive trip settings can then be selected, based on the loads being operated and the conditions in which they are being operated.

The 991206 circuit breaker is also constructed in such a way so as to provide reliable operation and protection for the devices in its application set. This includes features such as improved arc chutes, double insulation, and metal clad enclosed construction for improved safety. The breaker also provides superior performance, low temperature rise, and long life, thanks to its contact construction and magnetic trip mechanism.

In conclusion, the 991206 circuit breaker is a versatile piece of equipment that can be used in a wide range of residential, commercial, and industrial applications. With its adjustable trip settings, three-pole operation, and reliable construction, it makes an ideal choice for protecting both single and multiple devices from short circuits and overloads.

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