1620-2-20A

Series:	1620
Part Status:	Active
Lead Free Status / RoHS Status:	--
Breaker Type:	Thermal
Moisture Sensitivity Level (MSL):	--
Current Rating:	20A
Voltage Rating - DC:	12V
Number of Poles:	1
Actuator Type:	Automatic Reset
Illumination:	--
Illumination Voltage (Nominal):	--
Mounting Type:	Holder

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Circuit Breakers: A Application Field and Working Principle

Circuit breakers are a vital component of electrical system designs. They help ensure safe and efficient operation of the power grid by opening and closing circuits in response to an electric current overload or a fault. While circuit breakers are used in many different types of consumer and industrial products, they are most commonly utilized in residential, commercial, and industrial applications.Circuit breakers can be categorized into three main types – thermal, thermal-magnetic, and electromechanical. The type of breaker utilized depends on the specific application and the load, but all circuit breakers share the same fundamental design and function. Below is a brief overview of how circuit breakers work and their common application fields, starting with thermal circuit breakers.

Thermal Circuit Breakers

Thermal circuit breakers are typically used in smaller residential and consumer electronic applications due to their low cost and specifically designed purpose. They operate based on the principle of heat transfer, and can be divided into two main categories – thermal overload and short-circuit. In both cases, when the current that passes through the circuit reaches a predetermined limit, an internal bimetallic strip will start to heat up, eventually resulting in the release of a movable contact that opens the circuit and safely breaks the connection. Thermal circuit breakers are typically manually reset, which allows for troubleshooting the cause of the current overload before resuming the flow of electricity. This makes them one of the most accessible types of circuit breakers, and ideal for smaller applications that don’t require repeat trips or automation.

Thermal-Magnetic Circuit Breakers

Thermal-magnetic circuit breakers are a combination of both thermal and magnetic principles, making them some of the most common circuit breakers found in modern electrical systems. Like thermal circuit breakers, thermal-magnetic circuit breakers respond to both overload and short-circuit conditions, however they offer greater current protection than thermal breakers and are more durable in terms of reset ability. A thermal-magnetic circuit breaker consists of both a thermal unit and a magnetic unit, and utilizes both heat and electromagnetism to trip the circuit. The thermal unit consists of a thermal bimetallic strip, while the magnetic unit is comprised of an electromagnetic relay, which can be triggered by a voltage surge. When the tripping temperature of the thermal bimetallic strip is reached, the electromagnet relay is activated, trips the circuit breaker, and opens the connection. Thermal-magnetic circuit breakers offer the benefits of both thermal and magnetic circuit breakers, making them ideal for larger applications. They are also typically equipped with additional features such as adjustable trip settings and additional protection from overvoltage and undervoltage surges.

Electromechanical Circuit Breakers

Electromechanical circuit breakers are the most robust type of circuit breaker and are used in applications that require higher current protection and/or frequent switching operations, such as in industrial power grids and other high-power installations. Electromechanical circuit breakers operate using the same principles as thermal-magnetic circuit breakers, however they are more advanced and utilize more complex components.An electromechanical circuit breaker consists of an electromechanical relay, a solenoid, and a moving contact arm. When an over current or abnormally high current passes through the circuit, the electromechanical relay is triggered, which activates the solenoid releasing the moving contact arm, which trips the circuit and opens the connection. Electromechanical circuit breakers are designed for frequent switching operations, and are also equipped with advanced features such as adjustable trip settings and additional protection from overvoltage and undervoltage surges.

Conclusion

Circuit breakers are a vital component of any electrical system and are used in a variety of residential, commercial, and industrial applications. There are three main types of circuit breakers – thermal, thermal-magnetic, and electromechanical – each of which offer different levels of protection and features, depending on the specific application.Utilizing circuit breakers helps ensure that circuits do not become overloaded, significantly reducing the risk of damage to sensitive electrical components.

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