QLB-253-00DNN-3BA

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Introduction

A circuit breaker is an electrical component used to protect electrical systems, products, and components from damage due to excess current caused by overloads, short circuits, grounding faults, or other abnormal conditions. The QLB-253-00DNN-3BA is a multi-function circuit breaker that is capable of providing protection from overloads, short circuits, and ground faults, as well as a master disconnect switch. This article will discuss the application field and working principle of this circuit breaker.

Application Field

The QLB-253-00DNN-3BA circuit breaker is designed for use in residential, commercial, and industrial applications. It is suitable for use in AC networks, both single and three-phase, with rated currents ranging from 6 to 63A. The breaker is capable of providing protection against overloads, short circuits, and ground faults, as well as enabling a master disconnect switch. It has a wide range of operating temperatures and has high electrical, mechanical, and thermal endurance capacity. It is also suitable for use in damp and humid environments, as well as for surge protection in accordance with IEC 61643-1.

Working Principle

The QLB-253-00DNN-3BA circuit breaker works according to the principles of thermal and magnetic tripping. A current-sensitive coil is located inside the breaker, and when the current exceeds its rated capacity, the coil expands and triggers the release of an electromagnet, which in turn activates the mechanical tripping mechanism. This causes the contacts of the breaker to open, disconnecting the circuit and preventing any further damage. The circuit breaker also has a thermally sensitive element which triggers in the event of excessive thermal load. This causes the bimetallic element to bend and activate the mechanical tripping mechanism.

Conclusion

The QLB-253-00DNN-3BA is a multi-function circuit breaker suitable for residential, commercial, and industrial applications. It is capable of providing protection from overloads, short circuits, and ground faults, as well as enabling a master disconnect switch. The breaker works according to the principles of thermal and magnetic tripping, with a current-sensitive coil triggering the release of an electromagnet and a thermally sensitive element activating a mechanical tripping mechanism. The breaker is highly resilient, with a wide operating temperature range, and high electrical, mechanical, and thermal endurance capacity.

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