LEGBX66-70042-3-V Circuit Protection

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Circuit breakers are essential components in any electrical system in order to ensure the safety of both users and property. The LEGBX66-70042-3-V is a type of circuit breaker that is commonly found in residential, commercial, and industrial settings. This article will discuss the application field and working principle of the LEGBX66-70042-3-V.

Application Field

The LEGBX66-70042-3-V is a 3-pole circuit breaker that is designed for use in residential, commercial, and industrial settings. It is suitable for switchboards with AC DC power, and can be used to control the currents of single-phase two-wire and three-wire systems. It can also be used for isolation and short-circuit protection in distribution lines. The maximum rated voltage of the circuit breaker is 240V/50Hz for single-phase systems and 415V/50Hz for three-phase systems.

Working Principle

The LEGBX66-70042-3-V circuit breaker is is equipped with a thermal-magnetic trip unit. This trip unit consists of a thermal element and a magnetic element. The thermal element is responsible for sensing the amount of current passing through the circuit. If the current exceeds the rated current, the thermal element will heat up and open the circuit. The magnetic element will sense any sudden changes in the current, such as surges, and open the circuit as a safety precaution. The LEGBX66-70042-3-V also includes an electromechanical trip indicator that will show whether the trip is caused by a thermal or a magnetic overload.

In conclusion, the LEGBX66-70042-3-V is a 3-pole circuit breaker that is designed for use in residential, commercial, and industrial settings. It is equipped with a thermal-magnetic trip unit that will open the circuit if the current exceeds the rated current. The LEGBX66-70042-3-V also comes with an electromechanical trip indicator that allows for easy identification of the cause of the trip.

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