As a professional manufacturer specializing in silver contacts (in-mold riveting parts), stamping components, and low-voltage switches (such as wall switches and leakage switches), we focus on "safe electricity, safe switches, and safe electricians." Thank you for your attention and support! We are committed to delivering comprehensive safety power solutions to our customers.
A circuit breaker typically consists of several key components, including the contact system, arc extinguishing system, operating mechanism, trip unit, and housing. When a short circuit occurs, a large current (usually 10 to 12 times the normal level) generates a strong magnetic field that overcomes the spring's resistance, triggering the trip unit to activate the operating mechanism and instantly disconnect the circuit. In the case of an overload, the increased current causes more heat, which bends the bimetallic strip, pushing the mechanism to open the circuit. The higher the current, the faster the response.
Modern circuit breakers also include electronic types that use transformers to monitor phase currents. These systems compare the measured current with a set value, and if it exceeds the limit, the microprocessor sends a signal to the electronic trip unit, which then triggers the operating mechanism.
The primary function of a circuit breaker is to safely cut off or close a load circuit and isolate fault circuits to prevent accidents and ensure safe operation. High-voltage circuit breakers are designed to interrupt arcs that can reach up to 2 meters in length and carry currents of 1500–2000A at voltages of 1500V. Therefore, effective arc extinction is crucial for high-voltage circuit breakers.
Arc extinction works by cooling the arc to reduce its heat and accelerate the recombination of charged particles. At the same time, the arc is expanded and blown out, helping to restore the dielectric strength of the medium quickly.
Low-voltage circuit breakers, also known as automatic air switches, are used to control the connection and disconnection of electrical circuits, especially for motors that are not frequently started. They perform the combined functions of knife switches, overcurrent relays, voltage loss relays, thermal relays, and leakage protectors. As an essential protective device in low-voltage distribution systems, they offer multiple protection features such as overload, short-circuit, and under-voltage protection. Their adjustable settings, high breaking capacity, ease of use, and safety make them widely used in various applications.
A low-voltage circuit breaker consists of an operating mechanism, contacts, protection devices (including different types of trip units), and an arc extinguishing system. The main contacts 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. When a short circuit or severe overload occurs, the overcurrent release armature activates, causing the free-trip mechanism to open the main circuit. In the case of an overload, the thermal element heats up, bending the bimetal and triggering the mechanism. When the voltage drops, the undervoltage release armature releases, activating the free-trip mechanism. The shunt release allows remote control; when activated, it opens the main contacts.
Established 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, contact screws, electrical screws, DC and AC pins, rivets, silver dots, binding posts, and more. We also produce various products made from silver, copper, iron, aluminum, and non-ferrous metals. For more information, please contact Mr. Chen at 13728192869.
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