IULHK11-39571-70 Circuit Protection

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IULHK11-39571-70 application field and working principle

Circuit breakers are essential elements of an electrical distribution structure and are used to connect or disconnect parts of the network. They are built to allow a portion of the network to be isolated in cases where there is a problem in a particular circuit. Different types of circuit breakers, such as thermal, air, and oil, are available for use in different environments.

The IULHK11-39571-70 circuit breaker is a type of thermal circuit breaker designed for medium voltage applications. It is designed to provide protection from overvoltages, short circuits, high currents, and overloads. The circuit breaker is housed in a cuboid shape and is composed of a copper strip contact and an insulation structure.

Application Field

The IULHK11-39571-70 Circuit Breaker is designed for use in medium voltage applications, such as in the power industry in substations, industrial plants, and power transformers. It is suitable for three-phase systems with an operating voltage of 3.6~ 7.2kV. It is also suitable for high short-circuit breaking current applications and is capable of protecting equipment against both short circuit and overloads.

Working Principle

The working principle of the IULHK11-39571-70 circuit breaker is based on the thermal-magnetic characteristics of the circuit breaker. It is composed of a copper strip contact and an insulation structure. When the current passing through the breaker exceeds its rated current, the current in the copper strip contact produces heat, and this heat is then transferred to a bimetallic element, which causes the element to bend. The bending of the element comes in contact with the contact point, allowing it to break the circuit, thus preventing the electrical system from overloading.

When the current level is reduced, the bimetallic element returns to its original position and the circuit is re-closed. The IULHK11-39571-70 circuit breaker also features an adjustable trip current setting that allows the user to select the required trip current level.

In addition, the IULHK11-39571-70 circuit breaker also contains a shunt release mechanism that allows the breaker to quickly break the circuit when the load current exceeds the rated current by a factor of 2.5 or more. This feature ensures that the load is quickly disconnected, thus protecting the electrical system from overload.

Conclusion

The IULHK11-39571-70 circuit breaker is a thermal circuit breaker designed for medium-voltage applications. It is composed of a copper strip contact and an insulation structure and works on the principle of thermal-magnetic characteristics. The IULHK11-39571-70 circuit breaker is suitable for three-phase systems with an operating voltage of 3.6~ 7.2kV and is designed for high-short circuit breaking current applications. It also comes with an adjustable trip current setting and a shunt release mechanism that enables quick circuit breaking in cases of overload.

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