The differences in application scenarios between high-voltage and low-voltage circuit breakers mainly stem from their designed voltage levels, load-carrying capacities, and protection requirements. The following details the differences in their application scenarios from multiple dimensions:

I. Voltage Level Division of Core Application Scenarios

• High-voltage circuit breakers: Mainly applied in high-voltage power systems of 1kV and above, including medium-voltage (1kV-35kV), high-voltage (35kV-220kV), extra-high-voltage (220kV-1000kV), and ultra-high-voltage (above 1000kV) fields.
• Low-voltage circuit breakers: Mainly applied in low-voltage power systems below 1kV, commonly seen in 380V/220V industrial and civil power distribution scenarios.

II. Classification of Specific Application Scenarios

1. Typical Application Scenarios of High-Voltage Circuit Breakers

• Power transmission network:
• Incoming and outgoing circuits of substations, used to control and protect high-voltage transmission lines (such as 110kV and 220kV transmission lines).
• Hubs connecting generators to the power grid, such as the generator outlets of large thermal power plants and hydropower stations, which need to interrupt huge short-circuit currents.
• Industrial high-voltage power distribution:
• High-voltage incoming cabinets in large factories (e.g., 35kV incoming lines), providing power control and short-circuit protection for transformers in the factory area (e.g., 35kV/10kV transformers).
• High-voltage motor circuits in heavy industries like mining and metallurgy (such as high-voltage asynchronous motors), used for start-stop control and fault interruption.
• Special high-voltage facilities:
• Traction substations of rail transit (e.g., 27.5kV systems) to protect traction power supply lines.
• DC circuit breakers in high-voltage test stations and converter stations (DC transmission systems).

2. Typical Application Scenarios of Low-Voltage Circuit Breakers

• Civil and commercial power distribution:
• Distribution boxes in residential buildings (such as main switches and branch switches), controlling 220V loads like lighting and sockets, and achieving overload and short-circuit protection.
• Low-voltage distribution cabinets in shopping malls and office buildings, distributing 380V power supplies (such as for air conditioners and elevators) and 220V lighting power.
• Industrial low-voltage power distribution:
• Power cabinets in factory workshops, controlling low-voltage motors (e.g., 380V water pumps, fans), machine tools, and other equipment.
• Output terminals of photovoltaic inverters (usually 220V/380V), protecting the connection between photovoltaic systems and the power grid.
• Portable devices and terminals:
• Protection switches inside household appliances (such as overload protectors for air conditioners and refrigerators).
• Low-voltage circuit protection for mobile power supplies and charging piles.

III. Core Reasons for Differences in Application Scenarios

IV. Summary

In simple terms, high-voltage circuit breakers are the "guardians of the main arteries" of the power system, responsible for the control and protection of high-voltage power transmission and transformation links; low-voltage circuit breakers are "managers of capillaries", focusing on the safe operation of terminal power distribution, civil use, and small industrial equipment. They complement each other in voltage levels, protection scales, and application scenarios, jointly forming a complete protection system of the power system.