{"id":8234568,"date":"2026-10-24T17:30:32","date_gmt":"2026-10-24T17:30:32","guid":{"rendered":"https:\/\/scn.eu\/?post_type=scn_guide&#038;p=8234568"},"modified":"2026-10-24T17:30:32","modified_gmt":"2026-10-24T17:30:32","slug":"relae-halvlederrelae-kontaktor","status":"publish","type":"scn_guide","link":"https:\/\/scn.eu\/da\/guider\/relae-halvlederrelae-kontaktor\/","title":{"rendered":"Rel\u00e6, halvlederrel\u00e6 eller kontaktor? S\u00e5dan v\u00e6lger du rigtigt"},"content":{"rendered":"<div class=\"scn-guide\">\n<h1>Rel\u00e6, halvlederrel\u00e6 eller kontaktor? S\u00e5dan v\u00e6lger du rigtigt<\/h1>\n<p class=\"g-lead\">Et rel\u00e6, et halvlederrel\u00e6 (SSR) og en kontaktor sl\u00e5r alle en last til og fra med et lille styresignal. Hvilken du skal v\u00e6lge, afh\u00e6nger af str\u00f8m, sp\u00e6nding, hvor ofte du kobler, og om lasten k\u00f8rer p\u00e5 AC eller DC.<\/p>\n<div class=\"g-short\"><b class=\"t\">Kort svar<\/b><\/p>\n<ul>\n<li><b>Rel\u00e6<\/b> \u2013 mekaniske kontakter til styresignaler og mindre laster, som regel op til 10\u201316 A. Billigt og giver et reelt kontaktgab i frakoblet tilstand.<\/li>\n<li><b>Halvlederrel\u00e6 (SSR)<\/b> \u2013 ingen bev\u00e6gelige dele, lydl\u00f8st og slidfrit. Bliver varmt og kr\u00e6ver ofte en k\u00f8leprofil.<\/li>\n<li><b>Kontaktor<\/b> \u2013 et kraftigt rel\u00e6 til motorer, varme og forsyning, ofte i trefase og op til flere hundrede ampere.<\/li>\n<li><b>DC er sv\u00e6rere end AC<\/b> \u2013 j\u00e6vnstr\u00f8m har ingen nulgennemgang, der slukker lysbuen. V\u00e6lg komponenter, der er m\u00e6rket til DC.<\/li>\n<li><b>Tommelfingerregel<\/b> \u2013 hyppige koblinger: SSR. Sj\u00e6ldne koblinger, men h\u00f8j str\u00f8m: kontaktor.<\/li>\n<\/ul>\n<\/div>\n<h2>Hvad er forskellen p\u00e5 rel\u00e6, halvlederrel\u00e6 og kontaktor?<\/h2>\n<p>Et <b>rel\u00e6<\/b> har en spole, der tr\u00e6kker en bev\u00e6gelig kontakt, n\u00e5r den f\u00e5r str\u00f8m. Styresiden og lastsiden er galvanisk adskilt. P\u00e5 DIN-skinne lader mellemrel\u00e6er en PLC-udgang styre en ventil eller en lampe.<\/p>\n<p>Et <b>halvlederrel\u00e6<\/b>, SSR (solid state relay), har ingen bev\u00e6gelige dele. Styresignalet t\u00e6nder en lysdiode i en optokobler, og lyset styrer en thyristor, triac eller MOSFET, der leder laststr\u00f8mmen. Koblingen bliver lydl\u00f8s og slidfri. Prisen er varme og en lille l\u00e6kstr\u00f8m, ogs\u00e5 i frakoblet tilstand.<\/p>\n<p>En <b>kontaktor<\/b> er i princippet et rel\u00e6, der er bygget til stor effekt. Den har som regel tre hovedkontakter til trefase, slukkekamre til lysbuen og plads til hj\u00e6lpekontakter. Kontaktorer til AC afpr\u00f8ves efter IEC 60947-4-1 med brugskategorier, for eksempel AC-1 for resistiv last og AC-3 for start og stop af asynkronmotorer.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-rela-f1-da.webp\" alt=\"Principskitse: Et rel\u00e6 har en spole, der tr\u00e6kker en bev\u00e6gelig kontakt, et halvlederrel\u00e6 styrer en thyristor via en optokobler, og en kontaktor har en spole, der tr\u00e6kker tre hovedkontakter p\u00e5 \u00e9n gang\" width=\"1520\" height=\"500\" loading=\"lazy\" decoding=\"async\"><figcaption>Et rel\u00e6 og en kontaktor kobler med mekaniske kontakter, et halvlederrel\u00e6 med en halvleder.<\/figcaption><\/figure>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Egenskab<\/th>\n<th>Rel\u00e6<\/th>\n<th>Halvlederrel\u00e6 (SSR)<\/th>\n<th>Kontaktor<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"n\">Typisk str\u00f8m<\/td>\n<td>Op til 10\u201316 A<\/td>\n<td>Nogle f\u00e5 A til cirka 100 A pr. fase<\/td>\n<td>Fra cirka 10 A til over 1 000 A<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Slid<\/td>\n<td>Kontakterne slides<\/td>\n<td>Intet mekanisk slid<\/td>\n<td>Kontakterne slides, men t\u00e5ler mere<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Hyppige koblinger<\/td>\n<td>Mindre egnet<\/td>\n<td>Meget velegnet<\/td>\n<td>Mindre egnet<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Varme<\/td>\n<td>Lille<\/td>\n<td>Cirka 1\u20131,5 W pr. ampere<\/td>\n<td>Lille<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Typisk fejl<\/td>\n<td>Kontakterne svejses sammen<\/td>\n<td>Halvlederen g\u00e5r i stykker i ledende tilstand<\/td>\n<td>Kontakterne svejses sammen<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2>Varme, k\u00f8leprofil og nulgennemgang \u2013 det skal du vide om SSR<\/h2>\n<p>Et thyristorbaseret SSR har et sp\u00e6ndingsfald p\u00e5 cirka 1\u20131,5 V. Som tommelfingerregel giver det 1\u20131,5 W varme pr. ampere, s\u00e5 et SSR, der leder 25 A, skal af med 25\u201340 W. K\u00f8leprofilens evne angives som termisk modstand i K\/W \u2013 jo lavere, desto bedre. I et regneeksempel fra Celduc kr\u00e6ver et SSR, der leder 40 A ved 30 \u00b0C omgivelsestemperatur, en k\u00f8leprofil p\u00e5 1,2 K\/W.<\/p>\n<p>Et SSR med <b>nulgennemgangskobling (zero cross)<\/b> sl\u00e5r f\u00f8rst til, n\u00e5r vekselsp\u00e6ndingen passerer nul. Det giver f\u00e6rre forstyrrelser og passer til resistive laster som varmelegemer. Et SSR med <b>\u00f8jeblikkelig tilkobling (random)<\/b> sl\u00e5r til med det samme og passer til induktive laster som transformere, hvor tilkobling i nulgennemgangen kan give store indkoblingsstr\u00f8mme.<\/p>\n<div class=\"g-short\">\n<p style=\"margin:0\">Eksempel: En temperaturregulator sl\u00e5r et SSR til og fra hvert sekund for at holde en svejsebakke varm. Det giver over 80 000 koblinger i d\u00f8gnet \u2013 alt for mange til et mekanisk rel\u00e6.<\/p>\n<\/div>\n<h2>AC eller DC: derfor er j\u00e6vnstr\u00f8m sv\u00e6rere at afbryde<\/h2>\n<p>N\u00e5r kontakter \u00e5bner under last, dannes der en lysbue. Ved vekselstr\u00f8m passerer str\u00f8mmen nul 100 gange i sekundet (50 Hz), og buen g\u00e5r ud senest ved n\u00e6ste nulgennemgang. J\u00e6vnstr\u00f8m har ingen nulgennemgang. Buen kan br\u00e6nde videre og \u00f8del\u00e6gge kontakterne. Derfor klarer et rel\u00e6, der er m\u00e6rket 250 V AC, ofte kun 30 V DC ved samme str\u00f8m.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-rela-f2-da.webp\" alt=\"Diagram: Ved vekselstr\u00f8m g\u00e5r lysbuen ud, n\u00e5r str\u00f8mmen passerer nul, ved j\u00e6vnstr\u00f8m br\u00e6nder buen videre, indtil den slukkes aktivt\" width=\"1520\" height=\"540\" loading=\"lazy\" decoding=\"async\"><figcaption>Ved AC g\u00e5r lysbuen ud af sig selv ved nulgennemgangen. Ved DC skal den slukkes aktivt.<\/figcaption><\/figure>\n<p>I batterisystemer, elk\u00f8ret\u00f8jer og solcelleanl\u00e6g bruges der derfor <b>h\u00f8jsp\u00e6ndingskontaktorer til DC<\/b> til 400\u20131 500 V. Kontakterne sidder i et hermetisk t\u00e6t, gasfyldt kammer af keramik, og magneter bl\u00e6ser buen ud. Nogle modeller afbryder kun fuld str\u00f8m i \u00e9n retning. Et batteri, der b\u00e5de oplades og aflades, kr\u00e6ver en tovejskontaktor. Halvlederkontaktorer til DC afbryder helt uden lysbue.<\/p>\n<h2>Tidsrel\u00e6er, overv\u00e5gningsrel\u00e6er og sikkerhedsrel\u00e6er<\/h2>\n<ul>\n<li><b>Tidsrel\u00e6<\/b> \u2013 forsinker til- eller frakobling, blinker eller styrer stjerne-trekant-start af motorer. Eksempel: efterl\u00f8bstid for en ventilator.<\/li>\n<li><b>Overv\u00e5gningsrel\u00e6<\/b> \u2013 overv\u00e5ger sp\u00e6nding, str\u00f8m, frekvens, faser\u00e6kkef\u00f8lge eller cos \u03c6 og udl\u00f8ser, n\u00e5r en v\u00e6rdi kommer uden for gr\u00e6nsen. Eksempel: frekvensoverv\u00e5gning p\u00e5 et n\u00f8dstr\u00f8msanl\u00e6g.<\/li>\n<li><b>Sikkerhedsrel\u00e6<\/b> \u2013 overv\u00e5ger n\u00f8dstop, afsk\u00e6rmninger og lysgardiner. Det har tvangsstyrede kontakter og to kanaler og v\u00e6lges efter det performance level (PL efter EN ISO 13849-1), som risikovurderingen kr\u00e6ver.<\/li>\n<\/ul>\n<h2>Hvilken skal du v\u00e6lge? Anvendelseseksempler<\/h2>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Hvis du skal \u2026<\/th>\n<th>V\u00e6lg<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Forst\u00e6rke en PLC-udgang til en ventil eller lampe<\/td>\n<td>Mellemrel\u00e6 eller I\/O-rel\u00e6 p\u00e5 DIN-skinne<\/td>\n<\/tr>\n<tr>\n<td>Styre varme med mange koblinger i minuttet<\/td>\n<td>SSR med nulgennemgang og k\u00f8leprofil<\/td>\n<\/tr>\n<tr>\n<td>Starte og stoppe en trefasemotor<\/td>\n<td>Kontaktor dimensioneret til AC-3 og et motorv\u00e6rn<\/td>\n<\/tr>\n<tr>\n<td>Tilkoble og afbryde et batteri p\u00e5 400\u20131 500 V DC<\/td>\n<td>H\u00f8jsp\u00e6ndingskontaktor til DC<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<ul>\n<li><b>Fabrikker<\/b> \u2013 mellemrel\u00e6er til magnetventiler, SSR til svejsebakker i pakkemaskiner, kontaktorer til transportb\u00e5nd.<\/li>\n<li><b>K\u00f8ret\u00f8jer og mobile maskiner<\/b> \u2013 hovedkontaktorer i eltrucks, elbusser og minemaskiner.<\/li>\n<li><b>Energi<\/b> \u2013 batterilagre og solcelleanl\u00e6g p\u00e5 1 000\u20131 500 V DC, frekvensoverv\u00e5gning p\u00e5 generatorer.<\/li>\n<li><b>Infrastruktur<\/b> \u2013 pumpestationer med pumpeskifterel\u00e6 og tidsrel\u00e6er i ventilation.<\/li>\n<li><b>Luftfart og forsvar<\/b> \u2013 hermetisk t\u00e6tte rel\u00e6er til \u221270 til +125 \u00b0C.<\/li>\n<li><b>Laboratorier og medicoteknik<\/b> \u2013 lydl\u00f8se SSR til varme i inkubatorer og analyseudstyr.<\/li>\n<\/ul>\n<h2>Fem almindelige fejl<\/h2>\n<ol class=\"g-pit\">\n<li><b>SSR uden tilstr\u00e6kkelig k\u00f8leprofil.<\/b> M\u00e6rkestr\u00f8mmen g\u00e6lder kun med korrekt k\u00f8ling. Regn med temperaturen inde i tavlen.<\/li>\n<li><b>AC-m\u00e6rket rel\u00e6 p\u00e5 DC.<\/b> M\u00e6rkningen 10 A 250 V AC siger intet om DC. Kontroll\u00e9r DC-data i databladet.<\/li>\n<li><b>Forkert brugskategori.<\/b> En kontaktor klarer mere str\u00f8m ved resistiv last (AC-1) end ved motorer (AC-3). Dimension\u00e9r efter lasten.<\/li>\n<li><b>L\u00e6kstr\u00f8mmen bliver glemt.<\/b> Et frakoblet SSR l\u00e6kker nogle f\u00e5 milliampere \u2013 nok til, at en LED-lampe gl\u00f8der svagt, eller en PLC-indgang l\u00e6ser et 1-tal.<\/li>\n<li><b>Intet beskyttelseskredsl\u00f8b.<\/b> Induktive laster giver sp\u00e6ndingsspidser, n\u00e5r de afbrydes, og lamper og kondensatorer giver h\u00f8je indkoblingsstr\u00f8mme. Brug fril\u00f8bsdiode, RC-led eller varistor.<\/li>\n<\/ol>\n<h2>Rel\u00e6er og kontaktorer hos SCN<\/h2>\n<p>Vi har mellemrel\u00e6er fra Mibbo og Tele Haase, halvlederrel\u00e6er fra Celduc, Mibbo og Nominal Controls, k\u00f8leprofiler og tilbeh\u00f8r til SSR fra Celduc og h\u00f8jsp\u00e6ndingskontaktorer til DC fra Gigavac og Rincon Power. Tidsrel\u00e6er og overv\u00e5gningsrel\u00e6er kommer fra Tele Haase og hermetiske rel\u00e6er til luftfart fra Leach.<\/p>\n<h3>Eksempler fra vores sortiment<\/h3>\n<div class=\"g-prod\"><a class=\"g-pc\" href=\"https:\/\/scn.eu\/da\/vare\/sobr965560-th-da\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2025\/01\/SOBR965560-TH.jpeg\" alt=\"Celduc SOBR965560-TH dobbelt halvlederrel\u00e6, 2\u00d724 A\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Celduc<\/span><span class=\"g-pn\">SOBR965560-TH dobbelt halvlederrel\u00e6, 2\u00d724 A<\/span><span class=\"g-pw\">Nyhed: tofaset halvlederrel\u00e6 med nulgennemgang og push-in-klemmer, 2 \u00d7 24 A ved 24\u2013600 V AC \u2013 til varmelaster.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/da\/vare\/gx16-da\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2025\/01\/gx16.jpeg\" alt=\"Gigavac GX16 kontaktor til chassismontage\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Gigavac<\/span><span class=\"g-pn\">GX16 kontaktor til chassismontage<\/span><span class=\"g-pw\">Hermetisk t\u00e6t kontaktor til chassismontage, IP67 og IP69K, til \u221255 til 85 \u00b0C.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/da\/vare\/e1k-e3k-coupling-relays-da\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/tele-haase-coup-main.webp\" alt=\"Tele Haase E1K \/ E3K koblingsrel\u00e6er\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Tele Haase<\/span><span class=\"g-pn\">E1K \/ E3K koblingsrel\u00e6er<\/span><span class=\"g-pw\">Mellemrel\u00e6er til DIN-skinne, 8 A ved 250 V, der adskiller PLC-udgange fra lasten.<\/span><\/a><\/div>\n<div class=\"g-links\"><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/komponenter\/relaeer-og-stikdaser\/\">Rel\u00e6er og sokler<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/komponenter\/solid-state-relays-ssr-da\/\">Halvlederrel\u00e6er (SSR)<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/komponenter\/power-contactors-da\/\">Kontaktorer<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/komponenter\/timing-relays-da\/\">Tidsrel\u00e6er<\/a><a href=\"https:\/\/scn.eu\/da\/vare-kategori\/produkter\/komponenter\/monitoring-relays-da\/\">Overv\u00e5gningsrel\u00e6er<\/a><\/div>\n<div class=\"g-cta\">\n<p>Er du i tvivl om, hvorvidt lasten kr\u00e6ver rel\u00e6, SSR eller kontaktor? Sp\u00f8rg en af vores ingeni\u00f8rer \u2013 du f\u00e5r svar inden for 24 timer.<\/p>\n<p><a href=\"https:\/\/scn.eu\/da\/kontakt\/\">Sp\u00f8rg en ingeni\u00f8r<\/a><\/div>\n<h2>Ofte stillede sp\u00f8rgsm\u00e5l<\/h2>\n<details>\n<summary>Hvad er forskellen p\u00e5 et rel\u00e6 og en kontaktor?<\/summary>\n<p>Begge har en spole, der tr\u00e6kker mekaniske kontakter. En kontaktor er bygget til st\u00f8rre str\u00f8mme og har ofte tre hovedkontakter til trefase. Rel\u00e6er bruges prim\u00e6rt til styresignaler og mindre laster.<\/p>\n<\/details>\n<details>\n<summary>Kan et halvlederrel\u00e6 erstatte en kontaktor?<\/summary>\n<p>Ofte, hvis lasten kobles hyppigt, og du kan k\u00f8le varmen v\u00e6k. Til motorer, og hvor du \u00f8nsker et luftgab i frakoblet tilstand, er en kontaktor som regel bedre.<\/p>\n<\/details>\n<details>\n<summary>Hvorfor bliver mit halvlederrel\u00e6 varmt?<\/summary>\n<p>Halvlederen har et sp\u00e6ndingsfald p\u00e5 cirka 1\u20131,5 V, hvilket giver 1\u20131,5 W varme pr. ampere. Uden k\u00f8leprofil bliver rel\u00e6et for varmt allerede ved nogle f\u00e5 ampere.<\/p>\n<\/details>\n<details>\n<summary>Kan jeg bruge et AC-rel\u00e6 til j\u00e6vnstr\u00f8m?<\/summary>\n<p>Kun inden for de DC-data, der st\u00e5r i databladet. De er ofte meget lavere, fordi en lysbue ved DC er sv\u00e6rere at slukke.<\/p>\n<\/details>\n<details>\n<summary>Hvad er et mellemrel\u00e6?<\/summary>\n<p>Et rel\u00e6 mellem styresystemet og lasten. Det adskiller PLC-udgangen fra lasten og lader en svag udgang styre en st\u00f8rre str\u00f8m eller en anden sp\u00e6nding.<\/p>\n<\/details>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Et rel\u00e6, et halvlederrel\u00e6 (SSR) og en kontaktor sl\u00e5r alle en last til og fra med et lille styresignal. Hvilken du skal v\u00e6lge, afh\u00e6nger af str\u00f8m, sp\u00e6nding, hvor ofte du kobler, og om lasten k\u00f8rer p\u00e5 AC eller DC.<\/p>\n","protected":false},"author":11,"featured_media":8234399,"template":"","meta":{"_yoast_wpseo_focuskw":"kontaktor","_yoast_wpseo_metadesc":"Rel\u00e6, halvlederrel\u00e6 (SSR) eller kontaktor? Forskelle i str\u00f8m, levetid, varme og AC\/DC-afbrydning \u2013 og hvordan du v\u00e6lger den rigtige kontaktor eller rel\u00e6.","_kad_post_transparent":"","_kad_post_title":"hide","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"hide","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","_scn_guide_cats":[656,728,664,705,727],"_scn_guide_sectors":[1011,1037,1012],"_scn_guide_type":"tech","_scn_guide_order":36,"footnotes":""},"class_list":["post-8234568","scn_guide","type-scn_guide","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Rel\u00e6, halvlederrel\u00e6 eller kontaktor? 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