3RHP2850F

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Solid state contactors have become increasingly popular in industrial applications. One such contactor is the 3RHP2850F which is an economical, compact, and reliable contactor with a high surge current capability. This article will discuss the application field and working principle of the 3RHP2850F.

Application Field

The 3RHP2850F is primarily used for motor control applications, specifically AC-3 motor ratings up to 22kW (400 V) and allocated with a thermo-magnetic overload relay. The 3RHP2850F is a contactor that meets the actual motor breaking requirements and also does not require an additional external bypass contactor when used in an AC-3 application.

In addition to being used for motor control applications, the 3RHP2850F can also be used in other applications such as switching larger rectifier loads, lamps, and heating elements. It is also used as a general purpose power switch in applications such as door-openers and alarm systems.

The 3RHP2850F is a robust contactor that offers great reliability, even when it is exposed to harsh environments, and can withstand temperatures as low as -50°C or as high as 65°C.

Working Principle

The 3RHP2850F has an electromechanical design with a bridge rectifier and a voltage controlled thyristor. The bridge rectifier converts the AC power input into a DC voltage which is used to power the magnetic core of the contactor which closes the contact points when the desired voltage is reached. The thyristor is used to control the voltage which is used to power the contactor and is triggered by a control signal.

The 3RHP2850F is designed to switch loads up to 22kW (400V) and is capable of handling an inrush current of up to 400A at 230VAC. The material of the contactor is bronze and copper with silver contact. The contactor is designed to provide high reliability and long life, with operation cycles of up to 100,000.

The 3RHP2850F is designed with a built-in auxiliary contact which can be used as a helper contact for shorting the main contact to provide protection against voltage surges. The contactor also has an integrated reverse polarity protection to protect the circuit from being damaged by reverse polarity conditions.

In conclusion, the 3RHP2850F is an economical and reliable contactor with a high surge current capability. It is primarily used for motor control applications but can also be used for other applications such as rectifier loads, lamps, and heating elements. The contactor is designed with an electromechanical design with a bridge rectifier and a voltage controlled thyristor and is capable of handling an inrush current of up to 400A. The built-in auxiliary contact and reverse polarity protection provide additional protection for the circuit.

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