BR3D40UC Circuit Protection

Series:	BRxxxUC
Part Status:	Active
Lead Free Status / RoHS Status:	--
Breaker Type:	Thermal Magnetic
Moisture Sensitivity Level (MSL):	--
Current Rating:	40A
Voltage Rating - AC:	240V
Number of Poles:	3
Actuator Type:	Lever
Illumination:	None
Illumination Voltage (Nominal):	--
Mounting Type:	DIN Rail

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Circuit Breakers are electrical devices used to disconnect and isolate electrical power systems and equipment. BR3D40UC is one type of circuit breaker which is widely used and applied in many kinds of cases. This article will be focusing on the application field and working principle of BR3D40UC.BR3D40UC is mainly used in industrial and commercial applications where the installation space and required voltage are limited. It can be used as a main circuit breaker in panel box, switchgear and low voltage equipment, such as UPS power supply, air-conditioning equipment, computers, communication equipment and so on. Moreover, it can be used for the protection of medium voltage power systems ranging from 3.3kV to 24kV, thus making it suitable for a wide variety of applications.In terms of the working principle of BR3D40UC, it is based on the principle of thermodynamics that the circuit breaker can act as a protective device for physical contact, thermal and electrical effect. The device consists of two parts: the breaker and the contactor. The breaker contains an elementary particle, called the vacuum interrupter, which is used to disconnect the electrical circuit in case of overload or short circuit current. The contactor is a mechanical switch or electromechanical switch linked to the vacuum interrupter by an arcing coil and trigger. When the arcing coil is energized, it will cause the air gap between the breaker contacts to be closed, thus allowing the electric current to flow and the circuit to be completed.The thermal effect of BR3D40UC ensures its primary protection. Whenever an overload or short circuit occurs, the thermal effect of BR3D40UC will start to act, and the energy generated by the current will cause the over-temperature resistance device to release a signal. That signal will reach the thermal element and make the entire contactor system de-energize automatically. As result, the short circuit or overload current will be interrupted and the circuit will be disconnected to guarantee the safety of members downstream of the circuit.In conclusion, BR3D40UC circuit breaker not only is favored by its users in the market, but also is extensively applied in many kinds of industrial and commercial applications. It uses the principle of thermodynamics and consists of two parts to act as a protective device for physical contact, thermal and electrical effect. The thermal effect of BR3D40UC ensures its primary protection and is able to disconnect the circuit automatically in order to achieve the purpose of protecting the electrical system from any over-current or short circuit scenario.

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