3 Pole Copper Miniature Circuit Breaker

PUGAO (Plannter Electric) 3 Pole Copper Miniature Circuit Breakers have a beautiful and simple design with smooth lines, and are made of high-quality case materials with good flame retardancy. Besides, the compact size design and small volume make it easy to be installed in various distribution boxes and control cabinets, saving space.

The key components include contacts, arc extinguishing device, release mechanism and so on. The contacts are made of high-quality copper, which has good conductivity and wear resistance, reduces contact resistance and lowers heat loss. We use advanced arc extinguishing technology, such as arc extinguishing grids and arc extinguishing shields, which can quickly extinguish the arc when the circuit breaker breaks the circuit, preventing the arc from damaging the equipment. The release mechanism is the key to realize the automatic protection function of the MCB, when the circuit is overloaded, short-circuited and other faults, the release mechanism can be quickly acted on to make the circuit breaker trip and cut off the circuit, to protect the safety of electrical equipment and personnel.

Why Is Copper Essential for 3P Circuit Breakers?

In many applications, 3P circuit breakers are tasked with powering electric motors or large-scale industrial equipment, involving heavy current loads and prolonged operating periods. If, in an effort to reduce costs, materials such as copper-clad aluminum or even copper-plated iron are utilized for internal conductive components, performance will be compromised; specifically, the device will lack the distinct advantages offered by an all-copper construction:

1. Extremely Low Temperature Rise

The electrical resistivity of copper is significantly lower than that of aluminum or iron. When conducting high currents—such as 32A or 63A—pure copper conductive components generate substantially less heat. This ensures that the circuit breaker does not suffer from nuisance tripping caused by internal overheating, nor does its housing become brittle or degrade prematurely due to prolonged exposure to high temperatures.

2. Superior Short-Circuit Withstand Capability

Copper possesses superior mechanical strength and thermal stability. In the event of a short circuit—generating fault currents of 6kA or 10kA—the immense electromagnetic forces and the extreme heat of the electrical arc will not cause the conductive busbars to deform or melt, thereby ensuring that the breaker can safely and effectively interrupt the fault current.

3. Excellent Wiring Performance

Copper wiring terminals exhibit superior affinity with cables (which are typically also made of copper wire), resulting in lower contact resistance. Furthermore, copper is highly resistant to oxidation, thereby preventing overheating and charring at the wiring connection points.

Core Parameters

Rated Voltage: The rated voltage is AC400V, which can operate stably without accidents under 400V AC voltage environment, and is suitable for use in low-voltage power distribution systems, such as industrial plants, commercial buildings, residential houses and other places.

Warm tips: when choosing circuit breakers, the rated voltage must match the actual circuit voltage, otherwise it may lead to the circuit breaker can not work properly, and even cause safety accidents.

Rated current: The rated current ranges from 6A to 63A, which can meet the needs of different load currents.

Short-circuit breaking capacity: Model T8-3P Pugao 3 Pole Copper Miniature Circuit Breaker supports a short-circuit breaking capacity of up to 6kA. It has a strong short-circuit breaking capacity, which can quickly cut off the current in case of short-circuit faults, and effectively protects the safety of electrical equipment and the whole power system.

Our Manufacturing Standards

As a direct manufacturer, PUGAO (Plannter Electric) is committed to utilizing high-grade copper components in all of our high-specification 3-pole circuit breakers. You can proceed with bulk purchasing with complete confidence, or contact us directly to arrange specific customizations tailored to your project requirements.

Fully Automated Spot Welding Technology: We employ fully automated equipment to execute high-precision welding of copper contacts to the busbars, ensuring that the electrical resistance at the connection points is virtually zero.

T2 Grade Electrolytic Copper: We exclusively select high-purity electrolytic copper, strictly rejecting the use of any recycled or impure copper, thereby guaranteeing—right from the source—that our products achieve a genuine breaking capacity of 6kA.

Thick Silver-Plated Contacts: On the contact surfaces of our copper current-carrying components, we incorporate additional silver-based alloy contacts to prevent arc erosion—the burning away of the copper material caused by electrical arcs generated during circuit interruption.

Where Is a 3-Pole Copper Miniature Circuit Breaker Suitable for Use?