Understanding circuit breakers

Dongguan Yinyin Hardware Products Co., Ltd. is a full-service enterprise that integrates production, sales, and after-sales support. We welcome all buyers to contact us for detailed negotiations! As a professional manufacturer of silver contacts, in-mold riveting parts, stamping components, and low-voltage switches (such as wall switches and leakage protection switches), we focus on "safe electricity, safe switches, and safe electricians." Thank you for your attention and trust! Our goal is to provide customers with the most comprehensive and reliable power safety solutions. A circuit breaker is an electrical switching device capable of closing, carrying, and breaking current under normal operating conditions. It can also close and carry current during abnormal conditions, such as short circuits, within a specified time. Circuit breakers are widely used to distribute electrical energy, start motors occasionally, and protect power lines and motors from damage caused by overloads, short circuits, or voltage failures. They function similarly to fuses but do not require replacement after each fault. Circuit breakers can be classified based on their operation mode: electric, stored energy, or manual. In terms of structure, they come in universal and molded case types. According to usage, they are either selective or non-selective. Depending on the arc-quenching medium, they may use oil, sulfur hexafluoride, vacuum, or air. They can also vary in speed—fast or standard—and differ in the number of poles: single-pole, double-pole, triple-pole, or quadruple-pole. Installation methods include plug-in, fixed, and drawer types. A typical circuit breaker consists of a contact system, arc extinguishing system, operating mechanism, trip unit, and housing. When a short circuit occurs, the large current generates a strong magnetic field that overcomes the spring force, triggering the release mechanism and causing the circuit to trip instantly. During overload conditions, increased current leads to more heat, which causes a bimetallic strip to bend and activate the trip mechanism. The higher the current, the faster the response. Modern electronic circuit breakers use transformers to monitor phase currents, compare them with set values, and send signals to a microprocessor. If the current is out of range, the electronic trip unit activates the operating mechanism. The main function of a circuit breaker is to open and close the load circuit and isolate fault circuits to prevent accidents and ensure safe operation. High-voltage circuit breakers are designed to interrupt arcs at voltages up to 1500V and currents between 1500-2000A. These arcs can extend up to 2 meters, so effective arc extinction is crucial for high-voltage applications. Arc extinction works by cooling the arc to reduce heat, promoting recombination of charged particles, and blowing them away to quickly restore dielectric strength. Low-voltage circuit breakers, also known as automatic air switches, are used to control load circuits and start motors that are not frequently operated. They combine the functions of knife switches, overcurrent relays, undervoltage relays, thermal relays, and residual current devices. They are essential for protecting low-voltage distribution systems. Thanks to their wide range of protection features (overload, short circuit, undervoltage), adjustable settings, high breaking capacity, ease of use, and safety, low-voltage circuit breakers are widely adopted. Their structure includes an operating mechanism, contacts, protective devices (trip units), and an arc extinguishing system. The main contacts are manually or electrically closed. Once closed, the free-trip mechanism locks them in place. The overcurrent release coil and thermal element are connected in series with the main circuit, while the undervoltage release coil is connected in parallel. When a short circuit or severe overload occurs, the overcurrent release pulls in, triggering the free-trip mechanism to open the circuit. Overload causes the thermal element to heat up, bending the bimetal and activating the mechanism. Under-voltage causes the undervoltage release to disengage, also triggering the trip. The shunt release allows remote control, and when activated, it opens the main contacts. Founded in 2005, Dongguan Yinyin Hardware Products Co., Ltd. specializes in manufacturing a wide range of electrical components, including silver contacts, electrical contacts, double composite silver nails, riveted and soldered silver contacts, precision stampings, conductive copper posts, screws, DC/AC pins, rivets, silver dots, binding posts, and various other metal products made from silver, copper, iron, aluminum, and non-magnetic steel. For inquiries, please contact Mr. Chen at 13728192869. Keywords: relay contacts, composite contacts, switch contacts, silver contacts, dual composite contacts, shaped contacts, environmentally friendly contacts, in-mold riveting contacts, silver alloy contacts, rivet contacts, punching and riveting integrated contacts, solder contacts, and more. Http://news.chinawj.com.cn Submission.

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