{"id":1723,"date":"2025-04-11T12:55:12","date_gmt":"2025-04-11T12:55:12","guid":{"rendered":"https:\/\/webprojects.cloud\/wordpress\/splatco\/?post_type=spl_knowledgebase&#038;p=1723"},"modified":"2025-06-10T08:12:35","modified_gmt":"2025-06-10T08:12:35","slug":"hio16-relay-ratings","status":"publish","type":"spl_knowledgebase","link":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/product-documentation\/product-documentation-expansion-boards\/hio16-8-high-power-relays-20a-1hp-and-8-isolated-inputs\/hio16-inputs-and-outputs\/hio16-relay-ratings\/","title":{"rendered":"HIO16: Relay ratings"},"content":{"rendered":"\n<p>Note: This document is not yet complete. It may contain inaccuracies.<\/p>\n\n\n\n<p>The following is a summary of the relay contact ratings. For full details please see the\u00a0<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/wp-content\/uploads\/2025\/04\/JQX-102F.pdf\">relay data sheet<\/a>\u00a0(type jqx-102f):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Current rating (steady state); 20A at 240VAC<\/li>\n\n\n\n<li>Surge rating (motor turn-on): 80A at 240V (0.3 seconds)<\/li>\n\n\n\n<li>Horse power: 1HP @ 120VAC, 2HP @ 240VAC.<\/li>\n<\/ul>\n\n\n\n<p>The relays are characterized specifically for AC motor loads. It is generally held that for AC loads a resistive-capacitive snubber will reduce contact damage due to arcing. In our experience with comprehensive tests of driving a large contactor, this is not necessarily true. We found an R-C snubber actually did more harm than good. There is some excellent&nbsp;<a href=\"http:\/\/www.te.com\/en\/products\/relay-products\/application-notes.html\">material here<\/a>&nbsp;on this and other relay related topics.<\/p>\n\n\n\n<p>If you are driving DC inductive loads (say a 24VDC motor) you can reduce the strain on the relay contacts by connecting a diode across the load, cathode to the positive load terminal. This will prevent a spark from forming at turn-off. On a motor it will also act as a dynamic brake, making it stop faster. You should use a diode with a reverse voltage rating (PIV) greater than the DC supply voltage. For a non-motor load the diode should have a half cycle surge current rating equal to the DC load current. A 1N5404 will cover most applications. For&nbsp;<em>motor<\/em>&nbsp;loads the diode may need a higher current rating, because there will be stored rotational energy as well as electrical energy dissipated in the diode each time the motor stops. Don&#8217;t attempt to use diodes with AC loads.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Note: This document is not yet complete. It may contain inaccuracies. The following is a summary of the relay contact ratings. For full details please&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1718,"menu_order":5,"template":"","class_list":["post-1723","spl_knowledgebase","type-spl_knowledgebase","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>HIO16: Relay ratings - SPLat Controls<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"HIO16: Relay ratings - SPLat Controls\" \/>\n<meta property=\"og:description\" content=\"Note: This document is not yet complete. It may contain inaccuracies. The following is a summary of the relay contact ratings. 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