Intermediate relay (intermediate relay): used in relay protection and automatic control systems to increase the number and capacity of contacts. It is used to transfer intermediate signals in the control circuit. The structure and principle of the intermediate relay are basically the same as the AC contactor. The main difference from the contactor is that the main contact of the contactor can pass a large current, while the contact of the intermediate relay can only pass a small current. Therefore, it can only be used in control circuits. It generally does not have a main contact, because the overload capacity is relatively small. Therefore, all it uses are auxiliary contacts, and the number is relatively large. The new national standard defines the intermediate relay as K, and the old national standard as KA. It is generally powered by DC power. A few use AC power supply. The principle of the intermediate relay is that the coil is energized, and the moving iron core acts under the action of electromagnetic force to drive the moving contacts to separate the normally closed contacts and close the normally open contacts; when the coil is powered off, the moving iron core is driven by the spring The moving contact is reset, and the working principle of the relay is that when a certain input amount (such as voltage, current, temperature, speed, pressure, etc.) reaches a predetermined value, it is made to act to change the working state of the control circuit, thereby achieving the predetermined control Or the purpose of protection. In this process, the relay mainly plays the role of transmitting signals. Intermediate relay components Intermediate relay is a relay. Its principle is the same as AC contactor, which is composed of fixed iron core, moving iron core, spring, moving contact, static contact, coil, terminal and housing. Characteristics of intermediate relays The function of the intermediate relay is usually divided into two parts: the main circuit and the control circuit. The relay is mainly used for the control circuit, and the contactor is mainly used for the main circuit. The relay can realize the function of controlling one or several signals with one control signal. To complete start, stop, and linkage control, the main control object is the contactor; the contactor of the contactor is relatively large and has a strong carrying capacity. It can be used to control weak to strong electricity, and the control object is electrical appliances. Intermediate relay wiring diagram Portable power stations, also known as battery powered inverter generators, are rechargeable units capable of dispensing power for charging devices. It is equipped with AC outlet and USB charging ports. Camping trips and power outages are best applications of these units. The global portable power station market size is set to reach USD 482 million by 2026, according to Market Research Future (MRFR). It can display 7.60% CAGR over the forecast period (2020-2026). Huge demand for alternatives to gas generators and need for units capable of running heavy applications can drive the majority of the market demand. Best Wireless Power Bank,Wireless Power Bank For Iphone,Best Portable Battery Charger,Best Portable Charger Shenzhen Zhifu New Energy Co., Ltd. , https://www.sunbeambattery.com
1. The entire relay adopts a modular structure. Its structure is basically the same as the AC contactor, but the electromagnetic system is smaller and the number of contact groups is larger. The relay is small in size, light in weight, flexible and reliable, and has a mechanical life of 2 million times. The electrical insulation performance is very good. Other vibration resistance, flame retardant performance, temperature characteristics, and electrical performance meet or exceed the standard requirements. In addition, the appearance is novel and the maintenance is simple
2. Common intermediate relays also have main contacts and auxiliary contacts. There are generally four groups of main contacts and two groups of auxiliary contacts. Compared with the contactor, its main contact is smaller and the carrying capacity is low, which is mainly used to transmit control signals.
3. The role of the intermediate relay is used to transmit signals or control multiple circuits at the same time, and it can also be used directly to control small-capacity motors or other electrical actuators. 
1. Replacement of small contactors The contacts of the intermediate relay have a certain load capacity. When the load capacity is relatively small, it can be used to replace small contactors, such as electric rolling gates and the control of some small household appliances. This has the advantage that it can not only serve the purpose of control, but also save space and make the control part of the appliance more refined.
2. Increase the number of contacts This is the most common use of intermediate relays. For example, when a contactor's contact in a circuit control system needs to control multiple contactors or other components, an intermediate relay is added to the line.
3. Increasing the contact capacity We know that although the contact capacity of the intermediate relay is not very large, it also has a certain load carrying capacity, and at the same time the current required for driving is small, so the intermediate relay can be used to expand the contact capacity. For example, it is generally not possible to directly use the output of an inductive switch or a transistor to control electrical components with a relatively large load. Instead, an intermediate relay is used in the control circuit, and other loads are controlled by the intermediate relay to achieve the purpose of expanding the control capacity.
4. Conversion contact type In industrial control circuits, such a situation often occurs. The control requires the use of the normally closed contact of the contactor to achieve the control purpose, but the normally closed contact carried by the contactor itself has been used up and cannot complete the control task. At this time, an intermediate relay can be connected in parallel with the original contactor coil, and the normally closed contact of the intermediate relay can be used to control the corresponding component, and the contact type can be converted to achieve the required control purpose.
5. Used as a switch In some control circuits, the switching of some electrical components often uses intermediate relays, which are controlled by the opening and closing of their contacts, such as the automatic degaussing circuit common in color TVs or displays, and the transistor controls the switching of the intermediate relay, thus To achieve the role of controlling the demagnetization coil on and off.
6. Switching voltage
7. Eliminate the interference in the circuit. In industrial control or computer control circuit, although there are various
The market growth is attributed to rising use of smart electronic devices and huge requirement for uninterrupted power supply. Areas frequented by power outages caused by natural disasters are expected to be a lucrative market for portable power stations. Residents are shelling out for these generators for charging smartphones capable of calling emergency responders. Moreover, discounts and deals for portable power stations on ecommerce portals can drive the market volume significantly. The large opportunity for consumer electronic products owing to restrictions on movement during the pandemic can be leveraged by market players.
The long charging times and high costs of these generators can restrain market growth.