What Is an Electrical Switch, Compact Switch, or Open-Type Switch?
An electrical switch is a fundamental switching component used to manually or automatically open and close an electrical circuit, while also protecting the circuit against hazards such as overloads or short circuits. Going far beyond a simple on-off function, these devices ensure that electrical systems operate safely and reliably. Used in a wide range of applications, from homes to industrial facilities, electrical switches vary in design and function.
How Does an Electrical Switch Work?
The operating principle of electrical circuit breakers varies depending on the electrical load applied to them. They essentially include two protective mechanisms:
1. Thermal Protection
This system cuts off the circuit due to a rise in temperature caused by the current flowing through the circuit remaining high for an extended period. A bimetal strip—a metal with two different coefficients of thermal expansion—bends when exposed to heat, moving the trigger plate and opening the switch. This prevents cables from overheating and being damaged due to excessive load.
2. Magnetic Protection
In situations such as short circuits, where sudden and high current changes occur, the system quickly opens the circuit to protect it. The electrical current generates an electromagnetic force that activates the trip mechanism inside the switch. This ensures the circuit is interrupted within milliseconds.
Thanks to this dual mechanism, the electrical circuit breaker ensures the system’s safety against both prolonged overloads and sudden faults.
What Is a Compact Circuit Breaker or a Thermal-Magnetic Compact Circuit Breaker? Where Are They Used?
KA compact circuit breaker is an automatic circuit breaker designed within a compact housing that provides both thermal and magnetic protection within a specific current range. It is typically used in circuits ranging from 15A to 1600A and is installed in standard electrical panels.
Advantages of the Compact Circuit Breaker:
It provides simultaneous protection against overloads and short circuits.
It is physically small in size and saves space in the panel.
It offers flexible use with adjustable current ratings.
Precise protection is achievable thanks to electronic tripping units.
It has a wide range of applications, from residential panels to industrial facilities, and from generator outputs to compensation systems. The compact circuit breaker provides highly effective protection in terms of energy interruption time and response speed.
What Is an Open-Type Switch? What Is It Used For?
Open-type circuit breakers are air-insulated circuit breakers used for high current capacities and typically preferred in systems rated at 800A or higher. They are also known as Air Circuit Breakers (ACB).
The most important feature of these circuit breakers is their ability to safely extinguish the electrical arc generated when the circuit is opened using special arc chambers and an air-blowing system. This reduces the risk of fire and prevents damage to the device.
Where Are Open-Type Switches Used?
In low-voltage main distribution panels
At generator outputs
In transformer and inverter connections
In solar power generation facilities
In high-power motor and distribution systems
Why Should You Use an Open-Type Switch?
Open-type circuit breakers are equipped with advanced technology to maximize system safety. Their use is mandatory, particularly in areas with high energy density.
High breaking capacity: They can quickly interrupt high continuous currents or sudden short-circuit currents within milliseconds.
Remote control capability: On/off operation can be performed remotely via a motorized mechanism.
Flexible design: Can be customized for parameters such as rated current, voltage, and IP protection rating.
What Should You Consider When Choosing an Electrical Switch?
Selecting the appropriate circuit breaker is of great importance for both ensuring system safety and extending equipment lifespan. The following factors should be considered when making a selection:
Rated current and voltage
Short-circuit breaking capacity
Circuit breaker type (compact, open-type, modular, etc.)
Physical mounting dimensions
Whether an electronic trip unit is included
Need for additional accessories (auxiliary contacts, motor mechanism, test button, etc.)
An electrical circuit breaker is not merely a switch but a life-saving safety component in terms of energy safety. While compact circuit breakers offer space-saving and practical protection in medium-sized systems, open-type circuit breakers make a difference in high-power systems with their reliable and rapid response capability.
Using the correct type and capacity of a switch protects your equipment and ensures personal and property safety by preventing potential hazards. If you are unsure which switch is required for your electrical panel, consulting an electrical engineer or a specialized technical team is the best course of action.