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Arc Chamber
HAIPART
3013002
In low-voltage electrical systems, ACB (Air Circuit Breaker) parts are essential for circuit protection, and the ACB arc chamber is the core component that guarantees safe arc extinction. As a critical part of air circuit breakers (ACBs)—which are designed for high-current, low-voltage power distribution systems—the ACB arc chamber’s performance directly impacts the reliability of electrical grids, industrial power supplies, and the safety of personnel and heavy-duty equipment.
The ACB arc chamber is a specialized arc extinction device engineered exclusively for air circuit breakers. Unlike arc chambers for smaller circuit breakers, it is built to handle the intense, high-energy arcs generated when ACBs disconnect large currents (typically ranging from 630A to 6300A) in scenarios such as short circuits or overloads. Its primary function is to quickly extinguish these high-temperature arcs, preventing arc persistence that could cause severe damage to ACB contacts, insulation systems, or even lead to electrical fires and grid malfunctions. As one of the most vital ACB parts, it integrates advanced structural design, high-performance material science, and precision electrical engineering to achieve efficient, reliable arc extinction in high-current environments.
A high-quality ACB arc chamber features a robust, precision-engineered structure, tailored to withstand extreme thermal and electrical stress. It typically consists of 18–24 low-carbon steel Q235 plates (more than the smaller MCB counterpart, to handle higher arc energy) and 2–3 supports made of PA66 (GF30) natural color material reinforced with additional heat-resistant additives. Each component is selected for its ability to perform under harsh conditions:
After 3–5μm nickel plating (thicker than MCB arc chamber plates), these plates gain superior corrosion resistance, enhanced electrical conductivity, and improved thermal endurance. Their key role is to split the high-energy arc into multiple small segments, increasing the total arc voltage and accelerating heat dissipation—critical for quenching the intense arcs generated by ACB current interruption. The increased number of plates also ensures uniform arc distribution, preventing localized overheating.
The 30% glass fiber-reinforced nylon 66 support, modified with boron nitride or aluminum hydroxide additives, offers exceptional mechanical strength, heat resistance (withstanding temperatures up to 250°C), and electrical insulation. It provides stable structural support for the nickel-plated steel plates, ensuring the arc chamber maintains its shape and functionality even when exposed to the extreme heat of high-current arcs. This material also resists arc erosion, prolonging the service life of the ACB arc chamber.
When an ACB triggers circuit disconnection due to short circuits (with fault currents often exceeding 10kA) or overloads, an intense, high-temperature arc (reaching 10,000–15,000°C) forms between the breaker’s main contacts. The ACB arc chamber operates through a multi-stage synergistic mechanism to extinguish this arc efficiently and safely:
The arc chamber’s internal baffle structure (unique to ACBs) first guides the arc into the nickel-plated Q235 plate array. The multiple plates then split the single, high-energy arc into 18–24 small, independent arcs. This significantly increases the total arc voltage, making it far exceeding the system voltage—thus cutting off the arc’s energy supply and preventing it from re-igniting.
The high thermal conductivity of the nickel-plated surface and Q235 steel accelerates heat transfer from the arcs to the plates, quickly reducing the arc temperature below its ignition point (around 3,000°C). Additionally, the heat generated by the arc vaporizes small amounts of the arc chamber’s internal insulation material, forming a high-pressure, insulating gas (such as nitrogen) that further isolates the arc and suppresses re-ignition.
Within 10–20 milliseconds (faster than MCBs, to minimize grid impact), the combined effect of arc splitting, cooling, and gas insulation extinguishes the arc completely. The ACB arc chamber then maintains a reliable insulation gap between the disconnected contacts, ensuring the circuit remains safely isolated until the fault is resolved.
As the core protective component of air circuit breakers, the ACB arc chamber’s quality directly determines the ACB’s ability to safeguard high-current electrical systems:
It prevents arc-induced fires, melting of ACB contacts, and insulation breakdown in power distribution cabinets—protecting not only expensive industrial equipment (such as motors, transformers, and frequency converters) but also on-site maintenance personnel from electric shock or thermal injuries.
Strict material control (e.g., nickel coating thickness tolerance of ±0.5μm, PA66 dimensional stability within 0.1mm) and structural precision ensure the ACB arc chamber operates stably for 10,000+ switching cycles. This reduces unplanned downtime of electrical grids and industrial production lines, improving overall system reliability.
High-performance ACB arc chambers meet international electrical safety standards such as IEC 60947-2 (for low-voltage circuit breakers) and ANSI C37.13, ensuring compatibility with power systems worldwide. This is critical for manufacturers and end-users operating in global markets.
With the advancement of smart grids, renewable energy integration, and industrial electrification, the ACB arc chamber is undergoing continuous optimization to meet evolving demands:
Manufacturers are developing ceramic-reinforced PA66 composites and nanocoated steel plates to further improve heat resistance and arc erosion resistance, extending the arc chamber’s service life to 20,000+ cycles.
Through 3D simulation and topological optimization, the arc chamber’s size is being reduced by 15–20% while maintaining or improving arc extinction performance—enabling more compact ACB designs for space-constrained electrical cabinets.
Embedded temperature sensors and wear detectors are being integrated into arc chambers, allowing real-time monitoring of their operating status. This enables predictive maintenance, reducing the risk of sudden failures in critical power systems.
As a key part of ACB parts, the ACB arc chamber will remain at the forefront of circuit protection technology, adapting to the growing demands of high-reliability, smart, and energy-efficient electrical systems.
A1:1P/2P arc chambers are suitable for lighting and socket circuits; 3P/4P chambers are suitable for three-phase electrical equipment, with a breaking capacity of ≥6kA.
A2:The circuit breaker tripped;Cracks or burn marks appeared on the outer casing of the arc-extinguishing chamber.
A3:The main function of the arc chamber is to quickly extinguish the arc when the circuit is interrupted, preventing equipment damage and circuit failure.
A4:For 6kA (residential/small commercial), select a narrow size of ≤60mm; for 10kA (industrial), select a wide size of ≥80mm.
A5:Based on the arc extinguishing principle, the following can be selected: grid plate, magnetic blowout, or narrow-slot arc chamber; Based on the circuit type, AC circuits should prioritize grid plate/narrow-slot, while DC circuits must use magnetic blowout or staggered grid plate.
A6:Product prices vary depending on the model, specifications, and quantity. Please consult the sales team or check the official website for details.
A7:We provide comprehensive after-sales services, including product consultation, technical guidance, installation and commissioning, repair and replacement, and warranty.
A8:Technical support can be contacted through the official website, customer service hotline, or email.
A9:Our products have passed international and domestic quality certifications such as ISO 9001 and CE.
A10:We support customized arc chambers. Provide us with detailed technical parameters and requirements, and we will provide you with a customized solution.
Get a Quote
+86-13819777367
Sales@haipart.com
In low-voltage electrical systems, ACB (Air Circuit Breaker) parts are essential for circuit protection, and the ACB arc chamber is the core component that guarantees safe arc extinction. As a critical part of air circuit breakers (ACBs)—which are designed for high-current, low-voltage power distribution systems—the ACB arc chamber’s performance directly impacts the reliability of electrical grids, industrial power supplies, and the safety of personnel and heavy-duty equipment.
The ACB arc chamber is a specialized arc extinction device engineered exclusively for air circuit breakers. Unlike arc chambers for smaller circuit breakers, it is built to handle the intense, high-energy arcs generated when ACBs disconnect large currents (typically ranging from 630A to 6300A) in scenarios such as short circuits or overloads. Its primary function is to quickly extinguish these high-temperature arcs, preventing arc persistence that could cause severe damage to ACB contacts, insulation systems, or even lead to electrical fires and grid malfunctions. As one of the most vital ACB parts, it integrates advanced structural design, high-performance material science, and precision electrical engineering to achieve efficient, reliable arc extinction in high-current environments.
A high-quality ACB arc chamber features a robust, precision-engineered structure, tailored to withstand extreme thermal and electrical stress. It typically consists of 18–24 low-carbon steel Q235 plates (more than the smaller MCB counterpart, to handle higher arc energy) and 2–3 supports made of PA66 (GF30) natural color material reinforced with additional heat-resistant additives. Each component is selected for its ability to perform under harsh conditions:
After 3–5μm nickel plating (thicker than MCB arc chamber plates), these plates gain superior corrosion resistance, enhanced electrical conductivity, and improved thermal endurance. Their key role is to split the high-energy arc into multiple small segments, increasing the total arc voltage and accelerating heat dissipation—critical for quenching the intense arcs generated by ACB current interruption. The increased number of plates also ensures uniform arc distribution, preventing localized overheating.
The 30% glass fiber-reinforced nylon 66 support, modified with boron nitride or aluminum hydroxide additives, offers exceptional mechanical strength, heat resistance (withstanding temperatures up to 250°C), and electrical insulation. It provides stable structural support for the nickel-plated steel plates, ensuring the arc chamber maintains its shape and functionality even when exposed to the extreme heat of high-current arcs. This material also resists arc erosion, prolonging the service life of the ACB arc chamber.
When an ACB triggers circuit disconnection due to short circuits (with fault currents often exceeding 10kA) or overloads, an intense, high-temperature arc (reaching 10,000–15,000°C) forms between the breaker’s main contacts. The ACB arc chamber operates through a multi-stage synergistic mechanism to extinguish this arc efficiently and safely:
The arc chamber’s internal baffle structure (unique to ACBs) first guides the arc into the nickel-plated Q235 plate array. The multiple plates then split the single, high-energy arc into 18–24 small, independent arcs. This significantly increases the total arc voltage, making it far exceeding the system voltage—thus cutting off the arc’s energy supply and preventing it from re-igniting.
The high thermal conductivity of the nickel-plated surface and Q235 steel accelerates heat transfer from the arcs to the plates, quickly reducing the arc temperature below its ignition point (around 3,000°C). Additionally, the heat generated by the arc vaporizes small amounts of the arc chamber’s internal insulation material, forming a high-pressure, insulating gas (such as nitrogen) that further isolates the arc and suppresses re-ignition.
Within 10–20 milliseconds (faster than MCBs, to minimize grid impact), the combined effect of arc splitting, cooling, and gas insulation extinguishes the arc completely. The ACB arc chamber then maintains a reliable insulation gap between the disconnected contacts, ensuring the circuit remains safely isolated until the fault is resolved.
As the core protective component of air circuit breakers, the ACB arc chamber’s quality directly determines the ACB’s ability to safeguard high-current electrical systems:
It prevents arc-induced fires, melting of ACB contacts, and insulation breakdown in power distribution cabinets—protecting not only expensive industrial equipment (such as motors, transformers, and frequency converters) but also on-site maintenance personnel from electric shock or thermal injuries.
Strict material control (e.g., nickel coating thickness tolerance of ±0.5μm, PA66 dimensional stability within 0.1mm) and structural precision ensure the ACB arc chamber operates stably for 10,000+ switching cycles. This reduces unplanned downtime of electrical grids and industrial production lines, improving overall system reliability.
High-performance ACB arc chambers meet international electrical safety standards such as IEC 60947-2 (for low-voltage circuit breakers) and ANSI C37.13, ensuring compatibility with power systems worldwide. This is critical for manufacturers and end-users operating in global markets.
With the advancement of smart grids, renewable energy integration, and industrial electrification, the ACB arc chamber is undergoing continuous optimization to meet evolving demands:
Manufacturers are developing ceramic-reinforced PA66 composites and nanocoated steel plates to further improve heat resistance and arc erosion resistance, extending the arc chamber’s service life to 20,000+ cycles.
Through 3D simulation and topological optimization, the arc chamber’s size is being reduced by 15–20% while maintaining or improving arc extinction performance—enabling more compact ACB designs for space-constrained electrical cabinets.
Embedded temperature sensors and wear detectors are being integrated into arc chambers, allowing real-time monitoring of their operating status. This enables predictive maintenance, reducing the risk of sudden failures in critical power systems.
As a key part of ACB parts, the ACB arc chamber will remain at the forefront of circuit protection technology, adapting to the growing demands of high-reliability, smart, and energy-efficient electrical systems.
A1:1P/2P arc chambers are suitable for lighting and socket circuits; 3P/4P chambers are suitable for three-phase electrical equipment, with a breaking capacity of ≥6kA.
A2:The circuit breaker tripped;Cracks or burn marks appeared on the outer casing of the arc-extinguishing chamber.
A3:The main function of the arc chamber is to quickly extinguish the arc when the circuit is interrupted, preventing equipment damage and circuit failure.
A4:For 6kA (residential/small commercial), select a narrow size of ≤60mm; for 10kA (industrial), select a wide size of ≥80mm.
A5:Based on the arc extinguishing principle, the following can be selected: grid plate, magnetic blowout, or narrow-slot arc chamber; Based on the circuit type, AC circuits should prioritize grid plate/narrow-slot, while DC circuits must use magnetic blowout or staggered grid plate.
A6:Product prices vary depending on the model, specifications, and quantity. Please consult the sales team or check the official website for details.
A7:We provide comprehensive after-sales services, including product consultation, technical guidance, installation and commissioning, repair and replacement, and warranty.
A8:Technical support can be contacted through the official website, customer service hotline, or email.
A9:Our products have passed international and domestic quality certifications such as ISO 9001 and CE.
A10:We support customized arc chambers. Provide us with detailed technical parameters and requirements, and we will provide you with a customized solution.
Get a Quote
+86-13819777367
Sales@haipart.com
