4420.0459 Circuit Protection

Series:	AS168XDC2
Part Status:	Active
Lead Free Status / RoHS Status:	--
Breaker Type:	Thermal Magnetic
Moisture Sensitivity Level (MSL):	--
Current Rating:	6A
Voltage Rating - DC:	360V
Number of Poles:	2
Actuator Type:	Lever
Illumination:	--
Illumination Voltage (Nominal):	--
Mounting Type:	DIN Rail

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Circuit Breakers: 4420.0459 Application Field and Working Principle

Circuit breakers are electrical components used to protect circuits from overload and short circuits. The 4420.0459 is a molded case circuit breaker (MCCB) used mainly in industrial applications due to its high current ratings and high short circuit capacity. This article will discuss the application field and working principle of the 4420.0459 circuit breaker.

Application Field

The 4420.0459 circuit breaker is designed for industrial grade applications and is used to protect equipment and personnel against dangerous overcurrents and short circuits. The MCCB can handle currents up to 10,000A and has a short-circuit breaking capacity of up to 20,000A @ 80 kV. This makes it suitable for high-power circuits as well as applications with high short-circuit currents. It is also designed to be UL897 listed, making it suitable for use in hazardous locations.In addition to its high current and short-circuit capacities, the 4420.0459 is also capable of high speed trip-free operation. This is due to its advanced thermomagnetic trip unit, which is capable of tripping within 18-30 milliseconds when a current exceeds 1,500 A. This fast response allows the circuit breaker to quickly protect the circuit from overloads, thus avoiding any damage to the equipment or personnel.

Working Principle

The 4420.0459 circuit breaker is a three-pole MCCB with a thermal-magnetic trip unit. This trip unit is responsible for detecting and tripping the circuit when an overload or short-circuit occurs.When the circuit breaker is closed, there is no current flow, and the thermal and magnetic components of the trip unit are inactive. When a current higher than the rated current flow through the circuit, the thermal components of the trip unit will respond first by increasing their temperature. As the temperature increases, the setting of the trip unit will gradually increase and the trip will occur at a predetermined point.If the current is higher than the rated current but still lower than the pre-setting of the trip unit, then the magnetic components of the trip unit will come into play. As the current increases, the magnetic flux will increase until the force produced by this magnetic flux is enough to trip the circuit breaker.

Conclusion

The 4420.0459 circuit breaker is a high-quality MCCB that is suitable for industrial applications due to its high current and short circuit capacity. It also features a high-speed thermomagnetic trip unit, which is capable of quickly tripping the circuit under overloads or short circuits. This makes it a reliable way to protect personnel and equipment from dangerous currents.

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