{"id":15461,"date":"2020-08-06T10:00:00","date_gmt":"2020-08-06T02:00:00","guid":{"rendered":"http:\/\/blog.phoenixcontact.com\/marketing-sea\/?p=15461"},"modified":"2020-08-27T10:01:00","modified_gmt":"2020-08-27T02:01:00","slug":"differences-between-esd-and-fg-safety-relays","status":"publish","type":"post","link":"https:\/\/blog.phoenixcontact.com\/marketing-sea\/2020\/08\/differences-between-esd-and-fg-safety-relays\/","title":{"rendered":"Differences between ESD and F&G Safety Relays"},"content":{"rendered":"\n

There are 2 main applications of safety relays in the process industry. Phoenix Contact describes them as the Emergency Shutdown (ESD), and Fire & Gas (F&G) applications. Across the industry, there are many terms used to describe these 2 applications. In this article, we will have a look at the different terms and understand the uniqueness of each application.<\/p>\n\n\n\n

Application A<\/strong><\/td>Application B<\/strong><\/td><\/tr>
Emergency Shutdown (ESD)<\/strong><\/td>Fire & Gas (F&G)<\/strong><\/td><\/tr>
De-energized To Safe (DTS)<\/strong><\/td>Energized To Safe (ETS)<\/strong><\/td><\/tr>
De-energize To Trip (DTT)<\/strong><\/td>Energize To Trip (ETT)<\/strong><\/td><\/tr>
Normally Energized (NE)<\/strong><\/td>Normally De-energized (ND)<\/strong><\/td><\/tr><\/tbody><\/table>
Terms to describe the 2 applications<\/figcaption><\/figure>\n\n\n\n

Emergency Shutdown Application<\/h3>\n\n\n\n

Under normal operating conditions<\/strong>, a load like an electrical motor, must be continuously powered<\/strong>. The ESD safety relay which is used to power up a load must also be continuously powered and is described as Normally Energized (NE)<\/strong>.<\/p>\n\n\n\n

During a safety incident<\/strong> (e.g. the electrical motor is overheated), the load needs to be switched off<\/strong> to achieve a safe state. As the power status of the safety relay and load has a direct relationship, switching off (de-energizing) an ESD safety relay, will result in the load being switched off as well. Thus, the terms, De-energized To Safe (DTS)<\/strong> and De-energize To Trip (DTT)<\/strong> are used to describe this phenomenon.<\/p>\n\n\n\n

\"\"
Example of ESD relay application drawing<\/figcaption><\/figure><\/div>\n\n\n\n

Fire & Gas Application<\/h3>\n\n\n\n

Under normal operating conditions<\/strong>, a load like a sounder and a beacon is not powered<\/strong>. The F&G safety relay is only required to be powered up during a safety incident and to allow the sounders and beacons to sound off the alarm and provide light signals. Under normal operating conditions, the F&G safety relay is Normally De-energized (ND)<\/strong>.<\/p>\n\n\n\n

During a safety incident<\/strong> (e.g. a gas leak or fire incident), the load needs to be switched on<\/strong> to achieve a safe state. As the power status of the safety relay and load has a direct relationship, switching on (Energizing) an F&G safety relay will result in the load being switched on as well. Thus, the terms, Energized To Safe (ETS)<\/strong> and Energize To Trip (ETT)<\/strong> are used to describe this phenomenon.<\/p>\n\n\n\n

Some people might be confused by the term, Energize To Trip (ETT)<\/strong>. This is because the word \u201cTrip\u201d is commonly used on circuit breakers, where \u201cTrip\u201d here refers to power down. However, the word \u201cTrip\u201d has a deeper meaning and can be used to describe the powering up and down of a load. A similar word for \u201cTrip\u201d is \u201cTrigger\u201d, and you can think of it as \u201cEnergize To Trigger\u201d.<\/p>\n\n\n\n

\"\"
Example of F&G relay application drawing<\/figcaption><\/figure><\/div>\n\n\n\n

Summary<\/h3>\n\n\n\n

The key differences between the ESD and F&G safety relays are the type of load they are connected to, the definition of a safe state and the energy state under normal operating conditions. For ESD, the loads are usually machines used in production; the definition of the safe state is to switch off the relay \/ load and is normally energized under normal operating conditions. For F&G, the load are usually sounders and beacons, the definition of the safe state is to switch on the relay \/ load and is normally de-energized under normal operating conditions.<\/p>\n\n\n\n

In Phoenix Contact, we provide smart solutions for functional safety, from non-contact safety switches to complex controllers. Our applications range from machine building, the automotive industry, and the process industry. Our products are also SIL certified, which allows you to meet your project requirements easily.<\/p>\n\n\n\n

\"\"
Example of PxC Functional Safety Products<\/figcaption><\/figure><\/div>\n","protected":false},"excerpt":{"rendered":"

There are 2 main applications of safety relays in the process industry. Phoenix Contact describes them as the Emergency Shutdown (ESD), and Fire & Gas (F&G) applications. Across the industry, there are many terms used to describe these 2 applications. In this article, we will have a look at the different terms and understand the […]<\/p>\n","protected":false},"author":285,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1292],"tags":[1316,1317,1129,668],"class_list":["post-15461","post","type-post","status-publish","format-standard","hentry","category-safety-relay","tag-esd","tag-fg","tag-safety-relay","tag-safety-relays"],"yoast_head":"\nDifferences between ESD and F&G Safety Relays | Southeast Asia<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.phoenixcontact.com\/marketing-sea\/2020\/08\/differences-between-esd-and-fg-safety-relays\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Differences between ESD and F&G Safety Relays | Southeast Asia\" \/>\n<meta property=\"og:description\" content=\"There are 2 main applications of safety relays in the process industry. 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