Solid state relays are unique electronic switches that can be used by any industry and contain no moving parts. There are three main categories of solid state relays: the photo-coupled solid state relay, the transformer-coupled solid state relay and the hybrid solid state relay.

While solid state relay prices are often higher than those for other relays, there are a number of advantages to using regular or industrial solid state relays. Information about solid state relays concludes that these relays enjoy the following benefits when compared to mechanical relays or coil relays:

1. Solid state relay manufacturers will tell you one of the greatest benefits of a solid state relay is their long lifespan. Due to the fact that the solid state relay has no movable parts, there is nothing to wear out. You can increase your chances of not paying for replacement relays by choosing a solid state relay. They also have a built-in surge survival.

2. For solid state relay use with solenoids or inductive loads, solid state relays feature a high inrush capability.

3. Solid state relays also offer low control input requirements, which makes them advantageous in light of their easy system compatibility.

Action Steps
The best contacts and resources to help you get it done

Investigate solid state relay manufacturers

This is an important step in any online or phone purchase. You need to make sure that the solid state relay distributor from which you purchase your solid state relays is legitimate. Without investigating potential solid state relay providers, you can risk your money and the end product. While you investigate, you are going to want to compare prices to make the most economical decision as well.

I recommend: Newark and Opto 22 are two leading solid state relay distributors with reputations for quality. Explore the inventories of these solid state relay suppliers online.

Use solid state relays in kits, if needed

If you are concerned about your wire cutting capabilities, you may want to rely on some solid state relay kits in order to help you out. This makes the installation of such relays much easier and less complicated.

I recommend: QualityKits offers a couple of popular solid state relay kits, but you can also find solid state relay kits for specific projects. Comagination has a solid state relay kit for motorcycle lights and horns, while Aware Electronics has a solid state relay kit for alarm software.

Ensure adequate heatsinking for industrial solid state relays

In order to make sure that your solid state relays run in the most efficient manner possible to get you the best service, make sure that optimum air temperature and flow is enabled. Use heat sinks to help maintain proper temperatures around solid state relays since approximately 90% of problems with solid state relays are caused by heat issues.

I recommend: Power IO and Digi-Key.com are both able to offer effective heat sinks to protect your solid state relay. Digi-Key.com has a more extensive product listing.

Tips & Tactics

Helpful advice for making the most of this Guide

• •  If you are not sure whether to use solid state relays, consider the following: Solid state relay devices are generally preferred in situations where the switch life of the device needs to be completely independent of the number of switching cycles. Solid state relays are also often chosen for application in devices where there is severe shock or vibrations. They offer bounce-free, zero-current switching.