Relays

A relay is an electrical switch device that controls the opening and closing of one or more auxiliary circuits through electromagnetic induction or electronic control. The main function of an electrical relay is to control another circuit within a system, enabling the control and transmission of current or voltage without direct contact.

Relays functions：

Control circuit on/off states as a switch.
Amplify weak signals to control high-power loads.
Isolate control and controlled circuits for safe operations.
Protect circuit devices with features like overload and short-circuit protection.
Provide delay functions for time-delayed circuit operations.
Enable complex logic control, including automatic circuit state switching based on specific conditions.

Jak Electronics offers a diverse range of relay products, covering common types such as Solid State Relays (SSRs), Automotive Relays, and Power Relays. Our relay products play crucial roles not only in industrial equipment and machinery but also find extensive applications in automotive systems like engine control and lighting. Whether your field of application is industrial or automotive, JAK's relay product range provides reliable, efficient control, and protection solutions, offering strong support for your electronic projects.

Our relay product portfolio includes switch solutions from numerous leading brands, including Panasonic, Phoenix contact, weidmuller, Omron, Crydom and TE connectivity. By choosing Jak Electronics, you gain access to high-quality relay products from top brands that meet your requirements for reliability and performance.

Contact us now to discuss how our reliable and high-performance relay solutions can benefit your projects.

What is relay                                                                                                                                                                                                                          

In the field of electronics and automation control, relays are common control components. The wiring of a relay is a crucial aspect of its normal operation. Before understanding how a relay is wired, let's briefly understand the structure of a relay. Relays typically consist of a coil, contacts, and normally closed/normally open contacts. When the coil receives a certain current, it generates a magnetic field. This magnetic field causes the contacts to close or open, thereby controlling the high current or device.

Common wiring methods for relays                                                                                                                                                                           

• Direct Connection: Directly connecting the power source and load to a set of contacts on the relay.

Advantages: Simple and suitable for low-power, low-current circuits.

Disadvantages: May result in significant voltage drops affecting circuit performance with larger loads.

• Indirect Connection: Indirectly connecting the power source and load through an intermediate relay or contactor.

Advantages: Maintains good circuit performance even with higher currents.

Disadvantages: Requires more components, increasing circuit complexity.

• Reverse Connection: Connecting the power source positive terminal to the relay's normally closed contact and the load to the normally open contact.

Advantages: The load can remain powered when the relay coil loses power.

Disadvantages: Increases circuit power consumption, affecting efficiency.

a 4-pin relay wiring diagram 

Types of relays                                                                                                                                                                                                                      

• Electromechanical Relays (EMRs): The most common type, EMRs use electromagnetic forces to control switches, suitable for various applications.
• Solid State Relays (SSRs): SSRs utilize semiconductor devices for isolation and control without mechanical parts, offering fast response and longevity.
• Automotive Relays: Specifically for vehicles, these relays control electrical components with features like high temperature and vibration resistance.
• Other Types: Include Time Delay Relays for circuit timing, Control Relays for diverse functions, and Safety Relays ensuring system safety.

How do relays work？                                                                                                                                                                                                      

Relays work by using an electromagnet to control the flow of electric current. When a small electrical signal is applied to the relay's coil, it creates a magnetic field that pulls a switch (or multiple switches) to make or break a connection in the larger circuit. This allows relays to control high-power or high-voltage circuits with a low-power signal.

How to check relays                                                                                                                                                                                                          

Common relay malfunctions include no current output, unstable output, abnormal currents (too high or too low), and overheating during operation. These conditions may indicate issues with the relay, requiring prompt maintenance to ensure system stability.

Different inspection methods include:

• Check the coil: Use a multimeter to measure the coil at both ends of the relay to detect any open circuits or poor contacts. If the coil is damaged, the relay needs to be replaced.
• Clean or replace contacts: If the contacts have poor contact or welding, gently wipe the contact surface with fine sandpaper to remove oxides and restore normal operation. If the contacts are severely worn or loose, replacing the relay contacts can resolve the issue.
• Improve ventilation and heat dissipation: If the temperature around the relay is too high, consider adding ventilation equipment or relocating the relay to enhance heat dissipation.

Here is an useful video: