Copper MCB Miniature Circuit Breaker

The Copper MCB Miniature Circuit Breaker is a low voltage DC miniature circuit breaker (MCB) that protects circuits from short circuits and overload currents. It has 2P, 32A rated current and C type release curve. Rated short-circuit breaking capacity is up to 6kA and it has a mechanical life of up to 10,000 cycles. It can be mounted on DIN rail. Suitable for DC circuits such as industrial control and automation, transportation, renewable energy, etc.

Which Components of a Copper Miniature Circuit Breaker (MCB) Utilize Copper?

When designing and manufacturing Copper MCBs, PUGAO employs high-quality copper materials in three critical areas:

1. Contacts:

This is the most critical component; it utilizes silver-tin oxide, silver-cadmium oxide alloys, or silver-based copper composite materials.

Function: When interrupting high currents, the contacts generate an electric arc. Copper/silver alloys possess high heat resistance and resistance to ablation, ensuring that the contacts do not weld together after repeated tripping events.

2. Magnetic Trip Unit:

The electromagnetic coil located inside the MCB—which serves the function of short-circuit protection—is wound using enameled copper wire.

Function: Copper wire features low electrical resistance and generates minimal heat; furthermore, it enables the generation of a more precise magnetic field, thereby ensuring instantaneous magnetic attraction and tripping in the event of a short circuit.

3. Terminals and Busbars:

The metal components located at the product's power input and output ports are constructed from red copper (pure copper) or brass. Function: This ensures extremely low contact resistance once the wiring is connected, preventing the components from overheating and melting the housing—a risk associated with the prolonged flow of high currents.

Copper vs. Iron/Aluminum: Importance for MCBs

Function

1. Circuit protection, avoiding safety risks

During the operation of AC circuit, if the current is overloaded due to equipment failure, line aging, high load, or short circuit generates instantaneous high current, it may lead to equipment burning, circuit fire and other serious consequences. This Copper MCB Miniature Circuit Breaker can monitor the current change in real time, and when the current changes, PUGAO can monitor the current change in real time. when the current exceeds the rated value, the internal disconnecting mechanism will act quickly and cut off the fire wire and zero wire at the same time, completely cut off the power supply, minimizing the safety risk.

2. Completely isolate the power supply, improve operation safety

In circuit maintenance, equipment replacement or daily maintenance, it is necessary to ensure that the circuit is completely isolated from the power supply to avoid electric shock accidents. The PUGAO Copper MCB Miniature Circuit Breaker is designed to prevent accidental operation and is equipped with a clear on-off status indicator, which allows the operator to intuitively determine whether the circuit is open or not, thus further enhancing the safety factor of the operation.

3. Adaptable to single-phase high-power loads, stable power supply

For example, household high-power appliances (air conditioners, electric water heaters), commercial lighting systems, industrial single-phase equipment, etc. require reliable circuit protection devices to ensure stable operation. It has a wide range of rated currents for applications ranging from 6A to 63A. The Copper MCB Miniature Circuit Breaker is available in a wide range of current ratings from 6A to 63A. It has a wide range of current ratings from 6A to 63A, which can be flexibly selected according to the load demand, not only to meet the current demand of high-power equipment, but also to cut off the circuit in time when there is an abnormality, to ensure the stable operation of the equipment, and to minimize the interruption of production or life due to the circuit failure.

How to Identify a Genuine Copper Miniature Circuit Breaker (MCB)?

As a brand backed by over a decade of manufacturing expertise, PUGAO’s all-copper MCB series offers more than just verbal assurances regarding materials; we provide expert guidance during the product selection process and supply comprehensive test certificates alongside our products. You can verify whether an MCB meets the required "all-copper" specifications by examining the following key characteristics:

Breaking Capacity: Circuit breakers capable of achieving a breaking capacity of 6kA or 10kA must utilize high-quality internal copper components to withstand the immense energy generated during a short-circuit event.

Product Weight: For units of the same specifications, circuit breakers featuring all-copper internal components will feel noticeably heavier to the touch.

Temperature Rise Standards: Compliance with the IEC 60898-1 standard—which imposes strict limits on temperature rise—mandates the exclusive use of all-copper internal components.

FAQ

Q: Why are copper MCBs more expensive than standard MCBs?

A: The price of copper is more than three times that of aluminum and over five times that of iron. The premium you pay covers the assurance that the breaker will not fail to trip during critical moments, as well as the added safety margin required to prevent fires.

Q: Are all PUGAO circuit breakers made of copper?

A: Yes. For our entire product line, PUGAO utilizes copper or copper alloys for all core conductive components, ensuring full compliance with the international standard IEC 60898.

Q: Are copper MCBs suitable for home use?

A: Absolutely. Although household electrical currents are typically not very high, the wiring is often concealed within walls; should a circuit breaker overheat or a short circuit ignite a fire, the consequences could be catastrophic. Using copper MCBs represents the highest level of responsibility you can take for the safety of your family.