QLB-073-00DNN-3BA

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Circuit breakers are an essential yet widely misunderstood component of electrical systems, providing a crucial safety function. Quick-make breakers, such as the QLB-073-00DNN-3BA, are designed to quickly disconnect power in the event of an overload or short circuit. A QLB-073-00DNN-3BA is a trip-free, single-pole, thermal-magnetic circuit breaker which is widely used in industrial, commercial, and residential applications. This article will cover the QLB-073-00DNN-3BA’s application field and its working principle.

Application Field

QLB-073-00DNN-3BA circuit breakers are designed for use in low-voltage, 400-ampere, 3-pole installations – the most common type of domestic circuit. They are approved by both UL (Underwriters Laboratories) and CSA (Canadian Standards Association) and are suitable for both indoor and outdoor use. QLB-073-00DNN-3BA breakers are ideal for protecting residential electrical installations and power distribution systems in industrial automation, robotics, and manufacturing plants. They are also suitable for use in commercial applications such as hospitals, schools, and office buildings.

One of the main advantages of the QLB-073-00DNN-3BA circuit breaker is its high current interrupt capacity. It can disconnect a full load of 400 A in 4 ms, making it much quicker and more effective than traditional fuses.

Working Principle

A QLB-073-00DNN-3BA circuit breaker combines two different methods of protection: thermal and magnetic. The thermal element is a bimetallic strip that is attached to the breaker’s contacts. When the current passing through becomes too great, the bimetal strip bends and deforms; this causes the breaker’s contacts to open, interrupting the current.

The second element, the magnetic trip unit, is able to detect rapid increases in current (known as inrush current). In the event of an inrush current, the magnetic trip unit will cause the breaker to open regardless of the resistance of the bimetallic strip. This prevents the bimetal strip from becoming permanently deformed and ensures a reliable method of protection.

In addition to its fast response time, the QLB-073-00DNN-3BA circuit breaker also offers a number of other advantages. It has a manual override feature and an adjustable trip setting, making it easy to match the breaker’s settings to your system’s specific requirements. It also features a durable, high-impact plastic body that protects it from external shocks and vibrations and a visible test button for easy testing and troubleshooting.

These features make the QLB-073-00DNN-3BA a popular choice for both industrial and home installations. Its quick response time, adjustable settings, and reliable protection make it a reliable and effective solution for all your circuit protection needs.

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