CB1921-25

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Introduction

Circuit breakers are an important part of any electrical system. These devices are designed to protect electrical systems from potential damage due to overcurrent or overvoltage conditions. In this article we discuss the application field and working principle of the CB1921-25 circuit breaker.

Application Field

The CB1921-25 circuit breaker is designed for indoor applications with 240V service. It is suitable for use in domestic and commercial installations such as lighting circuits, air-conditioning systems, small appliance circuits, and other power distribution systems. The rated current for this model is 25A.

Working Principle

The CB1921-25 circuit breaker is composed of two main components – the contactor and the tripping element. The contactor is a spring-loaded armature and when the circuit is closed, the contactor closes, thereby providing a continuous supply of electrical energy. When an overloaded or short-circuited condition occurs, the tripping element is activated, causing the contactor to open, thus de-energizing the circuit.

The tripping element consists of a bimetal strip that is connected into a thermal-magnetic circuit. When an overload or short-circuit condition occurs, the temperature of the bimetal strip increases, causing it to expand. As it expands, it creates a force that reduces the contact position, thus disrupting the circuit.

The CB1921-25 also includes an independent over-current tripping function. In the event of excessive current, an electromagnet is activated which causes the contactor to open. The trip setting can be adjusted to accommodate a variety of conditions.

Conclusion

The CB1921-25 circuit breaker offers a reliable and cost-effective solution for the protection of electrical systems. It is easy to install and offers adjustable over-current tripping protection. This versatile device is suitable for both domestic and commercial applications.

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