Low-voltage circuit breakers, once commonly referred to as automatic switches, are essential electrical devices designed to safely control and protect electrical circuits. These breakers can handle normal load currents, overload conditions, and even short-circuit currents, making them a critical component in electrical systems. Beyond their basic switching function, they also provide various protective features such as overload protection, short-circuit protection, under-voltage protection, and sometimes even leakage current detection. This makes them ideal for ensuring the safety and reliability of electrical installations.
There are several types of low-voltage circuit breakers available, each suited for different applications. They can be categorized based on their use—some are selective, meaning their protective settings can be adjusted to match specific system requirements, while others are non-selective, with fixed protection parameters. Additionally, they can be classified by the arc-quenching medium used, such as air or vacuum. In many domestic applications, air-type circuit breakers are more commonly used due to their cost-effectiveness and ease of maintenance.
These devices come in a wide range of capacities, from as low as 4A up to 5000A, allowing them to be used in both small residential systems and large industrial power distribution networks. Low-voltage circuit breakers are widely employed in power distribution systems at all levels, in the control of machinery, and in protecting power terminals in various equipment. Their versatility and reliability make them an indispensable part of modern electrical infrastructure.
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