How To Choose The Power Relays From Shenler

With the development of relays, various types of relays have been designed to meet the control needs of different industries and different application scenarios. The power relay introduced in this article is an industrial relay that can handle high current and high voltage to control and protect equipment in order to meet the needs of high power loads. This article will introduce its definition, type, and working principle, so that we can have a deeper understanding of power relays, and then introduce the relevant situation of Shenler relays.

Definition And Types Of Power Relays

With the development of industrial intelligence, the demand for power automation has increased, and the demand for power relays has also increased significantly. Power relays are a special design of relays. They use the physical phenomenon of the generation and disappearance of magnetic force when the electromagnet is powered on and off to control the connection or disconnection of the circuit. They can withstand higher currents and voltages than ordinary relays, so they are particularly suitable for high-load circuits such as industrial generation and power systems. There are three main types of power relays:
Micro relays: As the name suggests, this type of relay is characterized by small size and light weight, and is suitable for small spaces and small volume environments. It is generally used in small devices such as household appliances, office automation equipment, and communication equipment. The contact capacity of micro relays is usually low, which is suitable for signal control and switching of small current loads.
PCB relay: This is a power relay that can be directly soldered to the PCB. This design can save space and is suitable for automation equipment and high-end electronic products. They usually have a small size and characteristics suitable for high-density assembly. PCB relays can be signal relays or power relays, depending on their design and load capacity
Industrial relays: As the name suggests, this is a type of relay suitable for industrial environments that can withstand harsh environmental conditions such as dust, vibration, high temperature and humidity. They usually have higher load capacity and stronger structure, suitable for industrial applications such as motor control, power management, automated production lines, etc.

Working Principle Of Power Relay

Power relays are generally composed of electromagnets, armatures, clips, contacts, springs, housings, terminals, etc. They are designed with normally open (NO) or normally closed (NC) contacts. A certain voltage is applied to both ends of the power relay coil. According to the electromagnetic induction phenomenon, the coil will generate a magnetic field. Under the action of the magnetic field, the armature will be pulled to the pole surface of the coil core by the suction force generated by the electromagnetic, and the clip connected to the armature will move, pushing the contact to open the normally closed contact and close the normally open contact. When the voltage or current at both ends of the coil is less than a certain value and the mechanical reaction force of the spring is greater than the electromagnetic suction force, the armature returns to the initial state under the action of the spring, the normally open contact is opened, and the normally closed contact is connected.
This is the entire working principle of the power relay, a simple and effective automatic control device. Therefore, in industrial production, the opening and closing of the entire circuit can be controlled by controlling the input current and voltage, realizing intelligent control without manual operation.

Application Of Power Relays

Power relays are used as safety circuits to prevent unexpected large currents from flowing into the circuit. In addition to safety circuits, it is also used as a main relay in products that handle large charges. The main applications include the following:
Electrical system: Power relays are often used in electrical systems to control the operation and shutdown of circuit systems by controlling the connection and disconnection of current in the circuit.
Household appliances: Power relays can also be used in household appliances. Because of their large size and efficient control of the opening and closing of circuits, they are often used for circuit control of household appliances.
Lighting control: Power relays can be used to control lighting systems, such as turning on/off room lights, street lights, and traffic lights.
Power distribution system: Power relays are used in power distribution systems to control the flow of current and prevent overload.
Communication industry: Power relays switch signals by controlling the switching of current, thus providing reliable support for the intelligent of the communication industry.
Industrial automation: Power relays can be used in automated manufacturing processes to control the movement of machinery.
Automotive industry: Power relays are also widely used in the automotive industry. They can be used in automotive systems to control the operation of various components (such as car lights, air conditioners, and electric windows).
Renewable Energy Systems: Power relays are used in renewable energy systems such as solar and wind systems to control the flow of electricity.

How To Choose A Power Relay

1. Load: The size of the load directly determines the performance of the power relay. Choosing a suitable load is conducive to its best performance. For example, small household appliances choose low loads, which are not only smaller in size, but also reduce the degree of heat generation during operation, ensuring safety and stability.
2. Coil: The coil can be said to be the core component of the power relay. Its reliability determines the stability and reliability of the entire power relay during operation. The resistance of the coil will affect the power of the relay and generate heat during operation. The higher the resistance, the more heat will be generated, and the power consumption of the relay will be higher. The number of coils will affect the strength of the magnetic field, thereby affecting the triggering action of the armature. Therefore, it is very important to consider the coil when selecting a power relay.
3. Voltage and Vurrent: Current and voltage directly determine the applicable range of the power relay. The rated current/rated voltage of the selected relay must match the current and voltage during operation. Normally, the rated current rated voltage of the power relay should be higher than that in actual use, leaving a certain safety range, which is more conducive to safety and stability in later use. Otherwise, the relay may be damaged or unable to work properly.
4. Contact parameters: including contact material, contact resistance, contact load, maximum switching current, maximum switching voltage and other parameters. The contact material ensures the durability and use characteristics of the contact, the contact resistance determines the heat and loss of the contact during operation, the contact load limits the current and voltage range of the contact during operation, and the maximum switching current and maximum switching voltage represent the maximum current and maximum voltage values ​​at which the contact can work stably. Exceeding this value will cause the contact to fail to work properly.
5. Triggering mode: In actual selection and use, the requirements for power relays are often different. According to actual needs, select a suitable triggering mode, including DC triggering, AC triggering, etc., to match the control mode of the circuit.
6. Response speed: The response speed determines the working efficiency of the power relay. According to the triggering mode mentioned in the fifth point, the response speed of DC triggering and AC triggering will also be different. The response time of DC voltage triggering will be shorter than that of AC voltage triggering, which is more suitable for applications that require fast switching, while AC voltage triggered relays are more suitable for high-frequency load control. Therefore, response speed is an important indicator for purchasing power relays. At present, the response speeds of power relays on the market are generally below 10ms, 10-50ms, and above 50ms. Choose the one that suits you according to different needs.
7. Working environment: The working environment will also affect the performance and service life of the power relay. For example, in a high temperature environment, the internal insulation performance will decrease, increasing the risk of use. Therefore, it is necessary to choose a better sealing and high temperature resistant material.
8. Safety and certification: It is directly related to the reliability and scope of application of power relays. Different industries or regions have different safety standards for products. Therefore, when choosing, it is necessary to consider whether the product has passed ISO, UL, CE, TÜV and other certifications. Professional certification not only ensures the safety of the product, but also ensures compliance and complies with the laws and regulations of the place of use.
9. Size and installation: It directly affects the use and installation of power relays in the equipment. The size directly determines whether they can be used, especially in small-volume equipment. They have limited space and strict requirements on the volume of components. Therefore, the size of the power relay should be reasonably selected according to the space of the equipment used to ensure reliable installation in the later stage.
10.Service life: Finally, when purchasing power relays, you also need to consider their service life, which directly determines the number of times the relay can operate normally. For example, if the usage scenario requires frequent switching or carrying high currents, you should choose a relay with a higher durability rating.

About Shenler Relays

Founded in 1985, Shenler is a leading manufacturer of relay products in China. Shenler is able to supply a wide range of high-quality relays, such as power relays, automotive relays and time delay relays. Shenler’s products are reliable and meet ISO 9001 international certification standards. They are suitable for a variety of industries. Shenler has accumulated rich experience and comprehensive capabilities through nearly four decades of development, especially in power relays. The REH Magnetic Blow-out Power Relay and REH Power Relay designed and developed are exported to more than 30 countries around the world. For companies that need high-quality manufacturing services, Shenler is a reliable and experienced partner that can provide a full range of services from design to production. If you are looking for a trustworthy manufacturer, Shenler is your best choice.

FAQ

1 How to maintain power relays?

As a precision electrical component, we need to focus on checking the contact wear of the relay during use, clean the surface dust and pollutants in time to ensure good heat dissipation, and ensure that it works within the rated power supply voltage and load current range.

2. What certifications do Shenler products have?

For different markets, our products have been approved by CURUS, UL, CE, ROHS, TUV, EAC, UKCA, CSA, COC, CP and other standard organizations to meet the needs of these markets.

3. Where can I buy your products?

If you are interested in our products, you can buy them from our online store or contact our sales department at [email protected].

4.What is the difference between high power relay and power relay？

The main difference between high-power relays and power relays is the usage scenarios and the current and voltage they can carry. High-power relays are generally suitable for large industrial machines, large motors and other high-power equipment, and can carry at least 50A of current. Power relays are generally suitable for home appliances, automobiles, communications and other industries, and the current they carry is generally below 50A. Therefore, their main difference is the current and voltage they carry.

--- END ---