Types and Selection of Intermediate Relays

The main function of intermediate relays is to convert low frequency signals into high-level signals, or to convert high-level signals into low-level signals. This conversion can achieve the connection between different circuits, thereby achieving the effect of signal conversion. There are various types of intermediate relays, and different types of intermediate relays are suitable for different usage scenarios. The following will provide a detailed introduction to the types and selection of intermediate relays.

1. Basic intermediate relay

The basic intermediate relay is the most common and simplest type of intermediate relay. Mainly used for signal amplification, conversion, and isolation in control circuits. The selection of basic intermediate relays should be based on the operating voltage, current, load type, and other parameters of the power supply.

2. Power intermediate relay

The power intermediate relay is a special type of intermediate relay mainly used to control the switch of the power supply. It can control the switch state of the power supply based on changes in control instructions, thereby achieving power operation. The selection of intermediate relays for power supply should be based on the rated voltage and current of the power supply.

3. Intermediate relay delay time

Time delay intermediate relay is a type of intermediate relay that can achieve time delay function. It can delay for a period of time after receiving control commands. The selection of intermediate relays should be based on the delay time and the working voltage and current of the control circuit.

4. Temperature control intermediate relay

The temperature control intermediate relay is a type of intermediate relay that can achieve temperature control functions. It can control the switch status of the circuit based on the temperature sensor signal, thereby controlling the temperature. The selection of temperature control intermediate relays should be based on the working voltage, current, and temperature sensor characteristics of the control circuit.

When selecting intermediate relays, attention should be paid to the following aspects:

1. Electrical parameters

The electrical parameters of intermediate relays are key factors to consider when selecting them. Common electrical parameters include rated current, rated voltage, maximum power, insulation resistance, circuit resistance, etc. Electrical parameters must be selected based on actual usage scenarios.

2. Functional requirements

The functional requirements of intermediate relays are also issues that need to be considered when selecting intermediate relays. Different intermediate relays have different functions, such as basic intermediate relays, time delay intermediate relays, power intermediate relays, temperature control intermediate relays, etc. Suitable intermediate relays must be selected based on actual business needs.

3. Environmental adaptability

The environmental adaptability of intermediate relays is also a consideration when selecting them. Different intermediate relays have different operating temperature ranges and protection levels. Suitable intermediate relays must be selected based on actual application scenarios.

4. Stability and lifespan

The stability and service life of intermediate relays are also issues that need to be considered when selecting them. The stability and service life of intermediate relays are related to factors such as materials, processing techniques, and usage scenarios. Intermediate relays with strong stability and long service life should be selected.

5. Packaging Type

The packaging type of intermediate relays is also a consideration when selecting them. Different intermediate relays have different packaging types, such as plug-in, patch, modular, etc. Suitable intermediate relays must be selected based on actual business needs.

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