UPL3-4104-1

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Circuit breakers provide an overload and short circuit protection for motors, transformers, generators, and all other devices and systems connected to the power grid. UPL3-4104-1 is a bimetallic temperature switch used in circuit breakers to perform certain protection functions, such as trip off for a large starting current or as an overload and short circuit protection device. In this article, we will discuss the UPL3-4104-1\'s application field and working principle.

UPL3-4104-1 Application Field

The UPL3-4104-1 is a thermal switch designed to trip the switch off when a certain temperature is reached. It can be used as overload protection, short-circuit protection, and in a variety of applications such as motors, transformers, generators, and other devices or systems connected to the power grid. It is especially suitable for single-phase asynchronous motor applications. This thermal switch is equipped with a bimetallic element which is composed of two different materials that react differently when subjected to heat. The bimetallic element is connected to contact points that will open the circuit when a certain temperature is reached.

Working Principle

When the temperature exceeds the set points, the bimetallic element bends, causing the contact points to open and trip off the switch. The lower end of the bimetallic element is connected to a bell-crank lever. Through mechanical action, this causes the contact points to open and trip off the circuit. A temperature dial can be used to adjust the temperature setting and the contact points will open when it is reached. The contact points can be reset manually by pressing the reset button.

UPL3-4104-1 has a built-in overload delay feature which prevents it from tripping prematurely due to transient loads. It also has a low resistance characteristic, which helps maintain a stable current flowing through the circuit. The UPL3-4104-1 is also equipped with a reset indicator, which shows when the switch has tripped and is resetting. Finally, the UPL3-4104-1 is designed to be protected against harsh environmental conditions, from electromagnetic interference and from dust and water ingress.

Conclusion

The UPL3-4104-1 is an effective protection device designed for single-phase asynchronous motor applications. It is equipped with a bimetallic element that will trip off the switch when a certain temperature is reached. This thermal switch is designed with overload protection delay feature, low resistance, and is protected against electromagnetic interference and dust and water ingress. With all its features, the UPL3-4104-1 makes it an ideal choice for circuit breakers.

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