4420.0166 Circuit Protection

Series:	AS168XAC1
Part Status:	Active
Lead Free Status / RoHS Status:	--
Breaker Type:	Thermal Magnetic
Moisture Sensitivity Level (MSL):	--
Current Rating:	27A
Voltage Rating - AC:	277V
Voltage Rating - DC:	65V
Number of Poles:	1
Actuator Type:	Lever
Illumination:	--
Illumination Voltage (Nominal):	--
Mounting Type:	DIN Rail

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Introduction

Circuit breakers are electrical appliances designed to protect electrical circuits from overloading and short circuiting when an abnormally high current passes through the circuit. Circuit breakers can provide a valuable service by allowing normal operation of the circuit to continue after transients or short circuits have generally died down.In this article, we’ll be discussing 4420.0166 and its application field and working principle.

4420.0166 Application Field and Working Principle

4420.0166 Application Field

4420.0166 is a three-phase circuit breaker manufactured by ABB. It has a high breaking capacity of 40kA and is designed to protect branch circuits from over-current and short circuit faults. It also has a range of features designed to increase safety in case of a fault. It is designed to be installed in a main distribution board, and is suitable for applications from domestic buildings to industrial grade applications.

4420.0166 Working Principle

4420.0166 circuit breaker uses a set of magnetically operated contacts that open when an overcurrent or short circuit is detected. The contacts are opended by the repulsion of two electromagnets, one of which is energised when the overcurrent/short circuit is detected and the other of which is attached to the main contacts. When the overcurrent/short circuit is detected, the energised electromagnet opens the contacts, isolating the circuit from the power supply. The contacts also snap back and close when the fault has cleared, allowing the circuit to continue to operate.To reset the circuit breaker, the reset button on the front of the unit needs to be pushed in. This will reset the contacts and the circuit breaker can then be used again. The 4420.0166 circuit breaker also has a range of safety features, such as overtemperature protection, which prevents the breaker from operating if it has been exposed to excessive heat, and an auxiliary switch to let the user know when the breaker has tripped.

Conclusion

4420.0166 is a high BREAKING capacity three-phase circuit breaker capable of protecting branch circuits from over-current and short-circuit faults. It is suitable for a range applications from domestic to industrial grade, and features an array of safety features.The working principle of the 4420.0166 is based on the operation of two electromagnets which repel each other to open the contacts when an over-current or short-circuit is detected. Once the fault has cleared, the contacts snap back and close, allowing the circuit to continue operating.The reset button on the front of the unit must be used to reset the circuit breaker after it has tripped, in order to restore its operation.

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