Home / Products / Relays
Electronic Components And Parts

Relay Parts

Nantian Electronics is a professional supplier of electronic components, we understand the pivotal role relays play in various industries. Relays are the unsung heroes, quietly ensuring the smooth operation of countless electronic systems. As a trusted seller of relays, we take pride in offering top-quality relay solutions to meet your specific needs. Here's why you should consider Nantian Electronics for your relay requirements.

Relay Definition

Relay is an electrical control device. It is an electrical appliance that causes a predetermined step change in the controlled quantity in the electrical output circuit when the change in the input quantity (excitation quantity) reaches the specified requirements. It has the interactive relationship between the control system (also called the input loop) and the controlled system (also called the output loop). Usually used in automated control circuits, it is actually an "automatic switch" that uses small current to control large current operation. Therefore, it plays the roles of automatic adjustment, safety protection, and conversion circuit in the circuit.

What does a relay do?

Relay is an automatic switching component with isolation function. It is widely used in remote control, telemetry, communication, automatic control, electromechanical integration and power electronic equipment. It is one of the most important control components.

As a control component, in summary, relays have the following functions:

  • (1) Expand the control range: For example, when the control signal of a multi-contact relay reaches a certain value, multiple circuits can be switched, opened, and connected at the same time according to different forms of contact groups.
  • (2) Amplification: For example, sensitive relays, intermediate relays, etc. can control circuits with large power with a very small control amount.
  • (3) Comprehensive signal: For example, when multiple control signals are input to a multi-winding relay in a prescribed form, the predetermined control effect is achieved after comparison and synthesis.
  • (4) Automation, remote control, and monitoring: For example, relays on automatic devices, together with other electrical appliances, can form a program control circuit to achieve automated operation.

Classification of relays

There are many types of relays. According to the input amount, they can be divided into voltage relays, current relays, time relays, speed relays, pressure relays, etc. According to the working principle, they can be divided into electromagnetic relays, inductive relays, electric relays, electronic relays, etc. According to the use, it can be divided into control relays, protection relays, etc. According to the input quantity change form, it can be divided into with or without relays and measuring relays.

The presence or absence of a relay operates based on the presence or absence of the input quantity. The relay does not operate when there is no input quantity, and the relay operates when there is an input quantity, such as intermediate relays, general relays, time relays, etc.

The measuring relay acts according to the change of the input quantity. The input quantity always exists during operation. The relay only acts when the input quantity reaches a certain value, such as current relay, voltage relay, thermal relay, speed relay, pressure relay, etc. Liquid level relay, etc.

Electromagnetic relay

Most of the relays used in control circuits are electromagnetic relays. Electromagnetic relays have simple structure, low price, easy use and maintenance, small contact capacity (generally below SA), large number of contacts and no distinction between primary and auxiliary, no arc extinguishing device, small size, quick and accurate action, and control Sensitive and reliable, it is widely used in low-voltage control systems. Commonly used electromagnetic relays include current relays, voltage relays, intermediate relays and various small general-purpose relays.

The structure and working principle of the electromagnetic relay are similar to those of the contactor, and it is mainly composed of an electromagnetic mechanism and contacts. There are two types of electromagnetic relays, DC and AC. Applying voltage or passing current to both ends of the coil generates electromagnetic force. When the electromagnetic force is greater than the reaction force of the spring, the armature is attracted to make the normally open and normally closed contact operate; when the voltage or current of the coil drops or disappears, the armature is released and the contact reset.

Thermal relay

Thermal relays are mainly used for overload protection of electrical equipment (mainly motors). The thermal relay is an electrical appliance that works on the principle of current thermal effect. It has inverse time action characteristics that are similar to the motor's allowable overload characteristics. It is mainly used in conjunction with contactors to protect three-phase asynchronous motors from overload and phase failure. In actual operation, asynchronous motors often encounter overcurrent (overload and phase failure) caused by electrical or mechanical reasons. sda100aa80

If the overcurrent is not serious and lasts for a short time, and the winding does not exceed the allowable temperature rise, this overcurrent is allowed; if the overcurrent is serious and lasts for a long time, it will accelerate the aging of the motor insulation and even burn the motor. Therefore, in A motor protection device should be installed in the motor circuit. There are many types of commonly used motor protection devices. The most commonly used and common one is the bimetallic thermal relay. Bimetallic thermal relays are all three-phase, with and without phase failure protection.

Time Relay

Time relays are used for time control in control circuits. There are many types, which can be divided into electromagnetic type, air damping type, electric type and electronic type according to their operating principles. According to the delay mode, they can be divided into power-on delay type and power-off delay type. The air damping time relay uses the air damping principle to obtain time delay. It consists of three parts: an electromagnetic mechanism, a delay mechanism and a contact system. The electromagnetic mechanism is a direct-acting double E-type iron core, the contact system borrows the I-X5 micro switch, and the delay mechanism uses an air bag damper.

Top 10 Solid State Relay Manufacturers

The top ten solid state relays and relay brands are ranked as follows:

1. Omron: A world-renowned automation control and equipment manufacturer with world-leading sensing and control core technologies

2. Panasonic: Founded in 1918, it is a Fortune 500 company, a world brand, a large multinational company, and one of the largest manufacturers in the world.

3. Hongfa HF: One of the world's major relay manufacturers and sellers, a well-known trademark in China, a high-tech enterprise, a famous brand in Fujian Province, and Xiamen Hongfa Acoustic Co., Ltd.

4. Tyco TE: One of the multinational companies with the largest number of employees in China, with 20,000 patents and patent applications, one of the top ten brands of relays

5. Schneider: With a glorious history of more than 170 years, it is a global expert in energy efficiency management, specializing in the power and automation management industry.

6. Siemens: Founded in Germany in 1847, one of the largest electromechanical/electrical engineering companies in the world

7. CHINT: Founded in 1984, it is China's largest low-voltage electrical appliance manufacturer in terms of production and sales, a well-known trademark in China, and a high-tech enterprise.

8. Delixi is a well-known trademark in China, a leading high-tech enterprise in the electrical industry, an influential brand, and a corporate technology center.

9. ABB: formed by the merger of two century-old international companies, a leader in power and automation technology, a Fortune 500 company, and a multinational enterprise.

10. Great Wall CNC: Founded in 1988, it is a well-known trademark in China, a high-tech enterprise, a famous brand product in Zhejiang Province, and an important backbone enterprise group in the electrical equipment industry.

Recommended Manufacturers
  • Image of Amphenol Pcd logo
  • Image of CEL (California Eastern Laboratories) logo
  • Image of Crouzet logo
  • Image of Omron Automation & Safety logo
  • Image of Panasonic Electronic Components logo
Electronic Parts Index
# 0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z