Dongguan Yinyin Hardware Products Co., Ltd. is a full-service enterprise that combines production, sales, and after-sales support. We welcome all buyers to contact us for detailed negotiations! As a professional manufacturer specializing in silver contacts, in-mold riveted parts, stamping components, and low-voltage switches (such as wall switches and leakage protection switches), we are dedicated to promoting "safe electricity, safe switches, and safe electricians." Thank you for your attention and trust! Our goal is to provide the most comprehensive safety power solutions to our customers.
Low-voltage circuit breakers play a vital role in low-voltage power distribution systems. They serve as protective devices with functions such as overcurrent, overload, and short-circuit protection, along with control and isolation capabilities. These breakers are widely used in both industrial and residential electrical systems. If not properly designed, they can lead to unnecessary power interruptions. Therefore, when designing a low-voltage power distribution system, it's essential to focus on selectivity and coordinated protection to ensure reliable performance.
Selectivity in low-voltage circuit breakers is crucial for maintaining the stability of the entire power distribution network. When an electrical fault occurs, the circuit breaker closest to the fault should trip first, while others remain unaffected. This ensures that only the affected area loses power, allowing other circuits to continue operating normally. Without proper selectivity, even minor faults can cause widespread outages, disrupting daily life and affecting appliances like refrigerators and range hoods.
Low-voltage circuit breakers can be divided into selective and non-selective types based on their protection characteristics. Selective breakers offer multiple protection levels, including instantaneous, short-time delay, and long-time delay, making them suitable for both short-circuit and overload protection. Non-selective breakers typically provide only short-circuit or overload protection, without the ability to distinguish between fault locations.
In a well-designed system, upper-level circuit breakers often use selective models, while lower-level breakers may be either selective or non-selective. To achieve selectivity, the upper breaker may use time delays in its short-delay trip unit. Key considerations include ensuring the upper breaker’s instantaneous setting is at least 1.1 times the next-level short-circuit current, and if the lower breaker is non-selective, the upper breaker’s short-delay setting should be no less than 1.2 times the lower one’s instantaneous setting. If both are selective, the upper breaker must have a delay of at least 0.1 seconds longer than the lower one.
Founded in 2005, Dongguan Yinyin Hardware Products Co., Ltd. has been a leading manufacturer of high-quality electrical components. We specialize in silver contacts, double composite silver nails, in-mold riveted contacts, precision stampings, conductive copper posts, electrical screws, pins, rivets, and more. Our products are made from materials such as silver, copper, iron, aluminum, and steel, catering to a wide range of industries. For inquiries, please contact Mr. Chen at 13728192869.
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