QLB-033-11B3N-3BA

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Circuit breakers are an important part of any electrical system. By offering protection against overloading or short circuit, they can be valuable when it comes to ensuring the safety and efficiency of industrial, commercial, and even residential electrical systems. One type of circuit breaker stands out for its exceptional performance – QLB-033-11B3N-3BA – and this article will explain its application field and working principles.

QLB-033-11B3N-3BA is a trip-free, thermal-magnetic circuit breaker. It’s designed for medium voltage applications with currents ranging from 120A to 800A in both 3- and 4-pole configurations. The breaker’s break and make capacity is rated at 75 KA and its interrupting time at 5 ms with a rated voltage of 690V. The QLB-033-11B3N-3BA is UL listed as well as IEC certified.

The circuit breaker is mainly used in industrial, commercial, and residential applications to protect and control branch circuit wiring from short-circuit damage and overloads. It can also be used in air conditioning systems, refrigeration, and for other low voltage applications in special environments.

The primary purpose of the QLB-033-11B3N-3BA is to protect the electrical circuit from overloads and short-circuit damage. To this end, it incorporates several features that allow it to detect and disconnect the circuit when desired levels of current or voltage have been reached. This is done via two distinct methods – thermal and magnetic.

Firstly, the thermal element of the QLB-033-11B3N-3BA works by employing bi-metallic plates which respond to heat generated by the current running through the circuit. As the current increases, the plates bend, eventually opening the breaker and disconnect it from the circuit. However, when the temperature in the circuit drops and the current decreases, the plates bend in the other direction to close the breaker.

The second element of the QLB-033-11B3N-3BA is the magnetic element, which is responsible for preventing the circuit from becoming overloaded due to a large current spike. When the current exceeds a predetermined limit, the magnetic force created by the current surpasses that of the bi-metallic plates and triggers the QLB-033-11B3N-3BA breaker, causing it to open and disconnect the circuit.

The QLB-033-11B3N-3BA also offers a number of other features, such as control relays, secondary auxiliary contacts, and built-in overload protection. All of these features work together to make the QLB-033-11B3N-3BA one of the most reliable and durable circuit breakers on the market.

In summary, the QLB-033-11B3N-3BA is a reliable and durable thermal-magnetic circuit breaker ideal for any medium voltage application. With its advanced features, such as control relays, secondary auxiliary contacts, and built-in overload protection, the QLB-033-11B3N-3BA is capable of protecting circuits from overloads and short-circuit damage. Hence, it is an ideal choice for any industrial, commercial, or residential electrical systems that require protection from overloaded or short circuits.

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