Dongguan Yinyin Hardware Products Co., Ltd. is a comprehensive enterprise that integrates production, service, 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), stamped components, and low-voltage switches (such as wall switches and leakage protection switches), we are committed to delivering safe electrical solutions with a 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 complete and reliable power safety services.
A circuit breaker typically consists of several key components: 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 rated current) generates a strong magnetic field that overcomes the spring's resistance, triggering the trip unit to actuate the operating mechanism, causing the switch to open instantly. In case of overload, the increased current leads to more heat, which causes the bimetallic strip to bend, pushing the mechanism and resulting in a delayed but automatic disconnection. The time it takes for the trip to occur depends on the magnitude of the current.
Modern electronic circuit breakers use transformers to monitor the current in each phase. This data is compared with a pre-set value, and if an abnormal condition is detected, the microprocessor sends a signal to the electronic trip unit, which then activates the operating mechanism.
The main function of a circuit breaker is to disconnect or close a load circuit and to cut off faulty circuits, preventing accidents and ensuring safe operation. High-voltage circuit breakers are designed to interrupt currents of up to 1500V and 1500–2000A, creating arcs that can extend up to 2 meters. These arcs must be quickly extinguished to prevent damage. The principle of arc extinction involves cooling the arc to reduce its temperature, promoting recombination of charged particles, and blowing them away from the gap to restore dielectric strength rapidly.
Low-voltage circuit breakers, also known as automatic air switches, are used to control and isolate load circuits, including motors that are not frequently started. They combine the functions of knife switches, overcurrent relays, under-voltage relays, thermal relays, and residual current devices. As an essential protective device in low-voltage distribution systems, they offer multiple protection features such as overload, short-circuit, and under-voltage protection, adjustable trip settings, high breaking capacity, ease of use, and enhanced safety.
The structure of a low-voltage circuit breaker includes an operating mechanism, contacts, protection devices (trip units), and an arc extinguishing system. The main contacts can be 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 under-voltage release coil is connected in parallel with the power supply. During a short circuit or severe overload, the overcurrent release armature pulls in, activating the free-trip mechanism and opening the main circuit. For overload conditions, the thermal element heats up, bending the bimetal and triggering the trip. Under-voltage conditions cause the under-voltage release armature to drop, also activating the free-trip mechanism. The shunt release allows remote control; when energized, it triggers the mechanism to open the 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, electrical screws, DC/AC pins, rivets, silver dots, binding posts, and various other custom-made products made from silver, copper, iron, aluminum, and non-ferrous metals. Contact Mr. Chen at 13728192869 for more information.
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 contacts, solder contacts, and more.
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