AC High Current Miniature Circuit Breaker

The most common type of home circuit breaker is the single-pole AC High Current Miniature Circuit Breaker, which consists of a single fire wire and a single zero wire, and is mounted on the home electrical panel to monitor and control the current within a single wire. It protects the single wire from overloads and short circuits. In case of an overload or short circuit condition, the circuit breaker will trip and automatically cut off the power supply. It can protect electrical equipment from electrical fires.

Our Technology

Handling high currents places immense demands on a product's mechanical structure and materials. Drawing upon over a decade of manufacturing expertise, PUGAO has implemented technical optimizations and upgrades to ensure that our AC High Current Miniature Circuit Breakers are perfectly tailored to meet the demands of real-world applications.

1. Thickened, All-Copper Internal Components

The higher the current, the more substantial the heat generated by internal resistance. All of our internal conductive bridges and coils are crafted from high-purity electrolytic copper, with a thickness increased by 30% compared to standard models, thereby keeping temperature rise within safe limits.

2. High Breaking Capacity as Standard

High-current circuits are typically situated at the front end of an electrical system. In the event of a short circuit, the prospective fault current can be extremely high. PUGAO's high-current series comes standard with a breaking capacity of 10kA, ensuring that the housing remains intact—without rupturing—during severe fault events, thereby safeguarding the distribution panel.

3. Large Silver-Alloy Contacts

To prevent contact welding under heavy loads, we utilize silver-based alloy contacts with a significantly larger surface area. This material not only boasts excellent electrical conductivity but also maintains consistently low contact resistance, even during frequent switching operations involving high currents.

Core Application Scenarios

For any application requiring high power capacity—particularly where minimizing the footprint within distribution cabinets is a priority—we highly recommend selecting our AC High Current Miniature Circuit Breakers. This applies especially to the following scenarios:

Main Incoming Line Protection: The main power switch for large villas, retail shops, and restaurants. Since the combined current draw of all household appliances may exceed 63A, an 80A or 100A main breaker is required.

Industrial Power Equipment: High-power motors, air compressors, and injection molding machines. These devices feature high inrush currents upon startup and high operating currents during operation, typically necessitating a high-current circuit breaker with a Type D tripping curve.

New Energy Vehicle Charging Stations: High-power DC and AC charging piles, where the output current frequently ranges between 80A and 125A.

Data Centers: Protection for server cabinet row distribution units (RDUs), requiring high-density installation capabilities combined with the capacity to handle high currents.

PV & Energy Storage Systems: Protection for the combiner box at the output stage of power inverters.

Difference between 2 Pole AC Circuit Breaker and 1 Pole Circuit Breaker

FAQ

1. Do you accept customized service?

We provide OEM/ODM service and can print your brand logo on the AC High Current Miniature Circuit Breaker. We can also provide satisfactory solutions according to your drawings and parameter requirements.

2. What are your payment terms? 

30% prepaid by wire transfer, 70% paid before shipment. Western Union and Letter of Credit are also acceptable.

3. Why does the width of a high-current circuit breaker appear to be the same as that of a standard one?

This is precisely where its ingenuity lies. It maintains the standard 18mm modular width, allowing it to be seamlessly mounted on a standard DIN rail. However, its interior features higher-specification insulating materials and a specialized heat-dissipation channel design to effectively manage the heat generated by high power loads.

4. Are there any special requirements when installing a high-current circuit breaker?

Torque is the key factor. For currents around 100A, even slightly loose terminal screws can generate enough heat to melt the plastic housing within a very short time. PUGAO recommends using a professional torque wrench and periodically checking the tightness of the wiring connections.