Understanding circuit breakers
2025-09-04 01:08:15
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As a professional manufacturer specializing in silver contacts (in-mold riveted parts), stamping components, and low-voltage switches (such as wall switches and leakage protectors), we focus on "safe electricity, safe switches, and safe electricians." Thank you for your attention and support! Our commitment is to provide the most complete safety power solutions to our customers.
A circuit breaker is an electrical switching device designed to close, carry, and break current under normal operating conditions, and to close and carry current under abnormal conditions, such as short circuits, within a specified time. It can be used to distribute electrical energy, start asynchronous motors occasionally, and protect power lines and motors by automatically disconnecting the circuit when severe overload, short circuit, or under-voltage faults occur. Essentially, it functions like a fuse switch and can work in conjunction with thermal relays. Importantly, it typically does not require replacing parts after interrupting a fault current, making it widely used today.
Circuit breakers can be categorized based on their operation mode: electric, stored energy, or manual. Based on structure, they are available as universal type or molded case. According to usage category, they are either selective or non-selective. In terms of arc extinguishing medium, they may use oil-immersed, sulfur hexafluoride, vacuum, or air. They also differ in action speed—fast or standard—and in the number of poles—unipolar, bipolar, tripolar, or quadrupolar. Installation methods include plug-in, fixed, or drawer type. Generally, a circuit breaker consists of a contact system, arc suppression system, operating mechanism, trip unit, and casing.
When a short circuit occurs, the strong magnetic field generated by the large current (typically 10–12 times the rated current) overcomes the spring's resistance, causing the release to pull the operating mechanism, resulting in an instantaneous trip. In case of overload, the increased current leads to more heat, which causes the bimetallic strip to bend and trigger the 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 if the current is abnormal, the microprocessor sends a signal to activate the electronic trip unit, which then triggers the operating mechanism.
The primary function of a circuit breaker is to open and close the load circuit, and to isolate the faulty circuit to prevent accidents and ensure safe operation. High-voltage circuit breakers are designed to handle voltages up to 1500V and currents between 1500–2000A. These arcs can extend up to 2 meters and continue burning without being extinguished, making arc suppression a critical challenge for high-voltage circuit breakers.
The principle of arc extinction involves cooling the arc to reduce heat, enhancing the recombination and diffusion of charged particles, and blowing away these particles from the arc gap to quickly restore dielectric strength.
Low-voltage circuit breakers, also known as automatic air switches, are used to control load circuits and motor operations that are not frequently started. Their function combines those of knife switches, overcurrent relays, voltage loss relays, thermal relays, and residual current devices. They are essential protection devices in low-voltage distribution systems.
Due to their multiple protection functions (overload, short circuit, undervoltage protection), adjustable trip settings, high breaking capacity, ease of use, and safety, low-voltage circuit breakers are widely applied. They consist of an operating mechanism, contacts, protection devices (such as trip units), and an arc suppression system.
The main contacts of a low-voltage circuit breaker are manually or electrically closed. Once closed, the free-trip mechanism locks the contacts 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 with the power supply. During a short circuit or heavy overload, the overcurrent release pulls the armature, triggering the free-trip mechanism to open the main circuit. Overload causes the thermal element to heat up, bending the bimetal and activating the free-trip mechanism. Under-voltage conditions cause the undervoltage release to de-energize, also triggering the free-trip mechanism. The shunt release allows remote control; when energized, it opens the main contacts.
Established in 2005, Dongguan Yinyin Hardware Products Co., Ltd. specializes in manufacturing silver contacts, electrical contacts, double composite silver nails, riveted silver contacts, soldered silver contacts, precision stampings, conductive copper posts, electrical screws, DC/AC pins, rivets, silver dots, binding posts, and various other products made from silver, copper, iron, aluminum, and non-magnetic steel. For inquiries, please contact Mr. Chen at 13728192869.
Popular search keywords: relay contacts, composite contacts, switch contacts, silver contacts, dual composite contacts, triple composite contacts, shaped contacts, environmentally friendly contacts, in-mold riveting contacts, silver alloy contacts, rivet contacts, punched and riveted integrated contacts, solder contacts, and riveted contacts.
Http://news.chinawj.com.cn Submission.
As a professional manufacturer specializing in silver contacts (in-mold riveted parts), stamping components, and low-voltage switches (such as wall switches and leakage protectors), we focus on "safe electricity, safe switches, and safe electricians." Thank you for your attention and support! Our commitment is to provide the most complete safety power solutions to our customers.
A circuit breaker is an electrical switching device designed to close, carry, and break current under normal operating conditions, and to close and carry current under abnormal conditions, such as short circuits, within a specified time. It can be used to distribute electrical energy, start asynchronous motors occasionally, and protect power lines and motors by automatically disconnecting the circuit when severe overload, short circuit, or under-voltage faults occur. Essentially, it functions like a fuse switch and can work in conjunction with thermal relays. Importantly, it typically does not require replacing parts after interrupting a fault current, making it widely used today.
Circuit breakers can be categorized based on their operation mode: electric, stored energy, or manual. Based on structure, they are available as universal type or molded case. According to usage category, they are either selective or non-selective. In terms of arc extinguishing medium, they may use oil-immersed, sulfur hexafluoride, vacuum, or air. They also differ in action speed—fast or standard—and in the number of poles—unipolar, bipolar, tripolar, or quadrupolar. Installation methods include plug-in, fixed, or drawer type. Generally, a circuit breaker consists of a contact system, arc suppression system, operating mechanism, trip unit, and casing.
When a short circuit occurs, the strong magnetic field generated by the large current (typically 10–12 times the rated current) overcomes the spring's resistance, causing the release to pull the operating mechanism, resulting in an instantaneous trip. In case of overload, the increased current leads to more heat, which causes the bimetallic strip to bend and trigger the 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 if the current is abnormal, the microprocessor sends a signal to activate the electronic trip unit, which then triggers the operating mechanism.
The primary function of a circuit breaker is to open and close the load circuit, and to isolate the faulty circuit to prevent accidents and ensure safe operation. High-voltage circuit breakers are designed to handle voltages up to 1500V and currents between 1500–2000A. These arcs can extend up to 2 meters and continue burning without being extinguished, making arc suppression a critical challenge for high-voltage circuit breakers.
The principle of arc extinction involves cooling the arc to reduce heat, enhancing the recombination and diffusion of charged particles, and blowing away these particles from the arc gap to quickly restore dielectric strength.
Low-voltage circuit breakers, also known as automatic air switches, are used to control load circuits and motor operations that are not frequently started. Their function combines those of knife switches, overcurrent relays, voltage loss relays, thermal relays, and residual current devices. They are essential protection devices in low-voltage distribution systems.
Due to their multiple protection functions (overload, short circuit, undervoltage protection), adjustable trip settings, high breaking capacity, ease of use, and safety, low-voltage circuit breakers are widely applied. They consist of an operating mechanism, contacts, protection devices (such as trip units), and an arc suppression system.
The main contacts of a low-voltage circuit breaker are manually or electrically closed. Once closed, the free-trip mechanism locks the contacts 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 with the power supply. During a short circuit or heavy overload, the overcurrent release pulls the armature, triggering the free-trip mechanism to open the main circuit. Overload causes the thermal element to heat up, bending the bimetal and activating the free-trip mechanism. Under-voltage conditions cause the undervoltage release to de-energize, also triggering the free-trip mechanism. The shunt release allows remote control; when energized, it opens the main contacts.
Established in 2005, Dongguan Yinyin Hardware Products Co., Ltd. specializes in manufacturing silver contacts, electrical contacts, double composite silver nails, riveted silver contacts, soldered silver contacts, precision stampings, conductive copper posts, electrical screws, DC/AC pins, rivets, silver dots, binding posts, and various other products made from silver, copper, iron, aluminum, and non-magnetic steel. For inquiries, please contact Mr. Chen at 13728192869.
Popular search keywords: relay contacts, composite contacts, switch contacts, silver contacts, dual composite contacts, triple composite contacts, shaped contacts, environmentally friendly contacts, in-mold riveting contacts, silver alloy contacts, rivet contacts, punched and riveted integrated contacts, solder contacts, and riveted contacts.
Http://news.chinawj.com.cn Submission.
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