LEG66-33558-15-V Circuit Protection

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Circuit Breakers

Circuit Breakers are an essential part of any electrical system. They are designed to be the first line of defense for overloading or short circuiting, providing protection for people, infrastructure and equipment. The LEG66-33558-15-V circuit breaker is a low-voltage circuit breaker designed for applications in the single/three-phase power distribution networks.

Application Field

The LEG66-33558-15-V circuit breaker is designed for applications in single/three-phase power distribution networks ranging from 230 V to 400 V AC. The breaker is available with both delayed magnetic and thermal trip characteristics, which can be selected by means of a selector marked clearly on the breaker. The breaker can also be used in DC power distribution networks at rated voltage of 24 V DC.

The LEG66-33558-15-V circuit breaker is especially suited to circuit protection of consumers, residential and commercial lighting, air conditioning, heat pumps and photovoltaic systems, as well as electric vehicles.

Working Principle

The LEG66-33558-15-V circuit breaker operates electromechanically. Its designed for automatically starting, stopping, transferring and protecting of electrical equipment, ensuring that an electrical circuit remains safe and secure.

The LEG66-33558-15-V circuit breaker operates with a three-pole switch. There are two current transformers, one on each of the power feeds and a third one controlling the trip coil. In the closed position, electric current passes through the breaker. The electric current is detected by the current transformer, which in turn generates a stored trip action.

When electric current reaches or exceeds the adjustable or fixed rated current, the integrated control unit activates the trip coil. The trip coil then engages a rapid-action mechanism that physically interrupts the electric current, thus protecting the system from further hazardous operation.

The LEG66-33558-15-V circuit breaker also allows manual testing of the operated equipment at any time. Interrupting current is indicated using an LED incorporated in the device.

Conclusion

The LEG66-33558-15-V circuit breaker is ideal for protecting consumers and electric equipment from dangerous overloads, short circuits and over current conditions. It is designed for single/three-phase power distribution networks, from 230 V to 400 V AC, as well as for DC power distribution networks at 24 V DC. The breaker is equipped with delayed magnetic and thermal trip characteristics and it permits manual testing with manual test/trip enabled as well.

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