The complete guide on the functionality of the SSR or solid-state relay

The complete guide on the functionality of the SSR or solid-state relay

What are a solid-state relay and the major applications of the solid-state relay?

The solid-state relay or commonly known as the SSR is an electronic switch when the small external electrical voltage passes through the terminals of the SSR. The relay can be designed for the intended purpose like AC or DC based on the requirement. The functions of the solid-state relay are precisely the same as the electromechanical relay, and the only aspect which makes the solid-state relay different from the electromechanical relay is it does not contain any moving parts.

Instead of the moving parts, the solid-state relays use semiconductor devices like thyristors and transistors to switch the power-up and up to a hundred amperes at a time. The solid-state relays or the SSR also possess faster switching speeds when compared to the electromechanical relays. The SSR also does not create any physical wear out like the electromechanical relay. The solid-state relay also provides limited arrangements, not like the electromechanical relays.

The significant advantages of the solid-state relay

  • The solid-state relay has a slim body and can allow tight packing to the users.
  • They also offer a silent operation as no noise is created like the electromechanical relay.
  • The SSR switching time is much faster than that of the electromechanical relay. The switching time is the time taken for the LED to turn ON and OFF, which is measured in micro and milliseconds.
  • They can also offer an increased and more prolonged life as they do not use any physical moving parts. Due to the non-availability of the material moving parts, they are also affordable, and the users are also free from the maintenance cost of the moving parts.
  • The amount of resistance at the output always remains constant and does not depend on the amount of use of the relay.

The significant disadvantages of the solid-state relay

  • The whole device of the SSR is also at risk of spurious switching due to the voltage. The entire transition process is carried at a good pace.
  • The SSR also offers isolated and a biased supply to the entire gate charge circuit.
  • The SSR also has more significant chances for a shorten output termed as fail, while the electromechanical relay can have more extended output termed as open.

New Applications Seek Better Relays

New Applications Seek Better Relays

Relays Are integral part of large systems, says inverter battery manufactures

In elementary terms, a relay is a remote control switch operated by current, temperature or magnetism. There are many different types of relays available in the market that you can choose from. A relay is supposed to meet several quality norms very strictly so that it is passed for its application. Many Inverter Dealers recommend the use of relays for a large number of reasons. According to, the market for relays is estimated to increase to a great value in the coming future. A relay is often categorized as a protective or safety equipment as any failure in its operation can also lead to a fire.

Relays in Day To Day Products

relay kit components spread on a table for displayIn every electronic appliance, a relay has a significant role to play. It is an undeniable fact that o circuit can be complete without it if electricity and current have to pass through it. The performance of a relay a lot depends on the material used for its construction. Indirectly, the growth of relay market will also boost the growth of the electronic raw material market in India. Companies are continually working on developing new varieties of a relay. The industry is changing at a faster pace today than it used to ever before. There are many leading manufacturers of electronic devices such as a relay who predict a better future for it in the future.

Technology in Relays

The innovation in this field is making its way to develop a world-class range of products to sort human life to the purest possible form. There are world renowned players like the Hongfa company which specializes in making relays for telecom and automotive application. It provides relays to sugar cube manufacturers also. The company has a wide range of more than 160 relays with not less than 40,000 specifications altogether. This alone explains the future expectancy from the industry.

The company introduced a DBC technology recently that could carve the path to a device with highest thermalInverter battery from inverter manufacturers efficiency. There is a possibility that if DBC works together with SSRs, the thermal energy of a device can be increased to something really close to infinity. This will be an excellent opportunity for our industrial sector as heat is a primary cause of loss of efficiency. With thermal productivity at its highest, the most significant reason for energy loss will be gone. Like every other electronic equipment, relays are also undergoing a lot of changes. Today we have a smaller sized relay that is cost effective too.

Growth Potential of Relays

The life of a relay in much more with the latest technology than what it used to be earlier. The rise in telecom and automotive industry has especially encouraged the growth of today’s relay industry. Today the most cost-effective and reliable materials are used in a relay making it a healthy choice for budget sensitive companies. The broad areas where the innovation is taking place are the contact coating and material, reduction in consumption of coil power, managing the arc power and lastly the improvement in contact bouncing and debouncing. It will be exciting to witness even better changes in the future when it comes to relaying as it is one of the most widely used electronic devices.

Watch Also : What is a Relay? How does a Relay work and types of Relays

Want To Choose The Best Relay?

Want To Choose The Best Relay?

Relays are available in different forms like a different style, technology and so on. The right kind of relay will differ from the application you seek from the device. Industrial Architects can give you an excellent professional opinion about it. According to relays are a tremendous alarming device used in security systems. A relay that is suitable for a person might not be ideal for your requirement. It is pretty obvious as the requirement can differ from application to application. You can select the best type of relay by analyzing the advantages and disadvantages they have got in terms of its construction and implementation.

First, you must know about the types of relays, and they are :

  • Reed relays
  • FET switches
  • Electromechanical relays
  • Solid State Relays

These are the basic types of ATE application. Let us talk about their strengths and weaknesses hereon. Starting with the most common one that is electromechanical relay have a shorter lifespan than many different types of a relay. However, it is more widely available in both non-latching and latching variants. It finds its application in a substantial number of switch modules. Most commonly used as compared to any other type of relay available in the market. The contacts are considered to be very reliable in this type of relay. They are versatile and come at an affordable pricing.

Reed relays are somewhat similar to the electromechanical types. The contacts of this kind are smaller and have less mass than those in other types of relays. The pace at which a reed relay switches is much higher than in case of an electromechanical relay. The contacts have less mass that encourages the connections to switch at a faster pace. There are more advantages to this variant that other kinds of relay options. One suggestion is that reed relay must not be used for extremely low voltage as it can produce you an alarming noise in the device. It can cause a disturbance in the process of taking measurements.

Solid state relays, just like the name suggests does not have any moving parts. This gives it a low maintenance credit as there is rarely any wear and tear. These are very fast because of the employ microprocessors also. The switching time is accurate as there are no movable parts. It is substantially reliable concerning how long it lasts. However, these are useful only for high voltage application. When the circuit is closed the resistance is negligible for an SSR, and as soon as it is open, there is infinite resistance in the circuit.

FET switches are not just the usual mechanical switches. It uses CMOS transistors in series to deliver a switching function. The gates of the transistor are driven directly in this case instead of driving an LED first and then the transistor gates. The switching speed is hence faster as the transistor operation happens instantly. Multiplexer configurations employ the FET switches making it ideal for low voltage and high-speed application. Now you can analyze your requirements and decide which relay is going to meet your demands more closely.

Watch Also : Types of Relay – Different Types of Relay – Classification of Relays