{"id":8234149,"date":"2026-10-24T17:30:32","date_gmt":"2026-10-24T17:30:32","guid":{"rendered":"https:\/\/scn.eu\/?post_type=scn_guide&#038;p=8234149"},"modified":"2026-10-24T17:33:35","modified_gmt":"2026-10-24T17:33:35","slug":"rela-halvledarrela-kontaktor","status":"publish","type":"scn_guide","link":"https:\/\/scn.eu\/sv\/guider\/rela-halvledarrela-kontaktor\/","title":{"rendered":"Rel\u00e4, halvledarrel\u00e4 eller kontaktor? S\u00e5 v\u00e4ljer du r\u00e4tt"},"content":{"rendered":"<div class=\"scn-guide\">\n<h1>Rel\u00e4, halvledarrel\u00e4 eller kontaktor? S\u00e5 v\u00e4ljer du r\u00e4tt<\/h1>\n<p class=\"g-lead\">Ett rel\u00e4, ett halvledarrel\u00e4 (SSR) och en kontaktor sl\u00e5r alla till och fr\u00e5n en last med en liten styrsignal. Vilken du ska v\u00e4lja beror p\u00e5 str\u00f6m, sp\u00e4nning, hur ofta du kopplar och om lasten g\u00e5r p\u00e5 AC eller DC.<\/p>\n<div class=\"g-short\"><b class=\"t\">Kort svar<\/b><\/p>\n<ul>\n<li><b>Rel\u00e4<\/b> \u2013 mekaniska kontakter f\u00f6r styrsignaler och mindre laster, oftast upp till 10\u201316 A. Billigt och ger ett verkligt kontaktgap i fr\u00e5nslaget l\u00e4ge.<\/li>\n<li><b>Halvledarrel\u00e4 (SSR)<\/b> \u2013 inga r\u00f6rliga delar, tyst och slitagefritt. Blir varmt och beh\u00f6ver ofta kylfl\u00e4ns.<\/li>\n<li><b>Kontaktor<\/b> \u2013 ett kraftigt rel\u00e4 f\u00f6r motorer, v\u00e4rme och matning, ofta i trefas och upp till hundratals ampere.<\/li>\n<li><b>DC \u00e4r sv\u00e5rare \u00e4n AC<\/b> \u2013 likstr\u00f6m saknar nollgenomg\u00e5ng som sl\u00e4cker ljusb\u00e5gen. V\u00e4lj komponenter som \u00e4r m\u00e4rkta f\u00f6r DC.<\/li>\n<li><b>Tumregel<\/b> \u2013 t\u00e4ta kopplingar: SSR. S\u00e4llan men med h\u00f6g str\u00f6m: kontaktor.<\/li>\n<\/ul>\n<\/div>\n<h2>Vad \u00e4r skillnaden mellan rel\u00e4, halvledarrel\u00e4 och kontaktor?<\/h2>\n<p>Ett <b>rel\u00e4<\/b> har en spole som drar en r\u00f6rlig kontakt n\u00e4r den f\u00e5r str\u00f6m. Styrsidan och lastsidan \u00e4r elektriskt \u00e5tskilda. P\u00e5 DIN-skena l\u00e5ter mellanrel\u00e4er en PLC-utg\u00e5ng styra en ventil eller lampa.<\/p>\n<p>Ett <b>halvledarrel\u00e4<\/b>, SSR (solid state relay), har inga r\u00f6rliga delar. Styrsignalen t\u00e4nder en lysdiod i en optokopplare, och ljuset styr en tyristor, triac eller MOSFET som leder laststr\u00f6mmen. Kopplingen blir tyst och slitagefri. Priset \u00e4r v\u00e4rme och en liten l\u00e4ckstr\u00f6m \u00e4ven i fr\u00e5nslaget l\u00e4ge.<\/p>\n<p>En <b>kontaktor<\/b> \u00e4r i princip ett rel\u00e4 byggt f\u00f6r stor effekt. Den har oftast tre huvudkontakter f\u00f6r trefas, sl\u00e4ckkammare f\u00f6r ljusb\u00e5gen och plats f\u00f6r hj\u00e4lpkontakter. Kontaktorer f\u00f6r AC provas enligt IEC 60947-4-1 med brukskategorier, till exempel AC-1 f\u00f6r resistiv last och AC-3 f\u00f6r start och stopp av asynkronmotorer.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-rela-f1-sv.webp\" alt=\"Principskiss: ett rel\u00e4 har en spole som drar en r\u00f6rlig kontakt, ett halvledarrel\u00e4 styr en tyristor via en optokopplare och en kontaktor har en spole som drar tre huvudkontakter samtidigt\" width=\"1520\" height=\"500\" loading=\"lazy\" decoding=\"async\"><figcaption>Ett rel\u00e4 och en kontaktor kopplar med mekaniska kontakter, ett halvledarrel\u00e4 med en halvledare.<\/figcaption><\/figure>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Egenskap<\/th>\n<th>Rel\u00e4<\/th>\n<th>Halvledarrel\u00e4 (SSR)<\/th>\n<th>Kontaktor<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"n\">Typisk str\u00f6m<\/td>\n<td>Upp till 10\u201316 A<\/td>\n<td>N\u00e5gra A till cirka 100 A per fas<\/td>\n<td>Fr\u00e5n cirka 10 A till \u00f6ver 1 000 A<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Slitage<\/td>\n<td>Kontakterna slits<\/td>\n<td>Inget mekaniskt slitage<\/td>\n<td>Kontakterna slits, men t\u00e5l mer<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">T\u00e4ta kopplingar<\/td>\n<td>Passar s\u00e4mre<\/td>\n<td>Passar mycket bra<\/td>\n<td>Passar s\u00e4mre<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">V\u00e4rme<\/td>\n<td>Liten<\/td>\n<td>Cirka 1\u20131,5 W per ampere<\/td>\n<td>Liten<\/td>\n<\/tr>\n<tr>\n<td class=\"n\">Typiskt fel<\/td>\n<td>Kontakterna svetsas ihop<\/td>\n<td>Halvledaren g\u00e5r s\u00f6nder i ledande l\u00e4ge<\/td>\n<td>Kontakterna svetsas ihop<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2>V\u00e4rme, kylfl\u00e4ns och nollgenomg\u00e5ng \u2013 det du beh\u00f6ver veta om SSR<\/h2>\n<p>Ett tyristorbaserat SSR har ett sp\u00e4nningsfall p\u00e5 ungef\u00e4r 1\u20131,5 V. Som tumregel blir det 1\u20131,5 W v\u00e4rme per ampere, s\u00e5 ett SSR som leder 25 A m\u00e5ste bli av med 25\u201340 W. Kylfl\u00e4nsens f\u00f6rm\u00e5ga anges som termisk resistans i K\/W \u2013 ju l\u00e4gre, desto b\u00e4ttre. I ett r\u00e4kneexempel fr\u00e5n Celduc beh\u00f6ver ett SSR som leder 40 A vid 30 \u00b0C omgivning en kylfl\u00e4ns p\u00e5 1,2 K\/W.<\/p>\n<p>Ett SSR med <b>nollgenomg\u00e5ngstillslag (zero cross)<\/b> sl\u00e5r till f\u00f6rst n\u00e4r v\u00e4xelsp\u00e4nningen passerar noll. Det ger mindre st\u00f6rningar och passar resistiva laster som v\u00e4rmeelement. Ett SSR med <b>momentant tillslag (random)<\/b> sl\u00e5r till direkt och passar induktiva laster som transformatorer, d\u00e4r tillslag i nollgenomg\u00e5ngen kan ge stora inkopplingsstr\u00f6mmar.<\/p>\n<div class=\"g-short\">\n<p style=\"margin:0\">Exempel: en temperaturregulator sl\u00e5r till och fr\u00e5n ett SSR varje sekund f\u00f6r att h\u00e5lla en svetsback varm. Det blir \u00f6ver 80 000 kopplingar per dygn \u2013 f\u00f6r m\u00e5nga f\u00f6r ett mekaniskt rel\u00e4.<\/p>\n<\/div>\n<h2>AC eller DC: d\u00e4rf\u00f6r \u00e4r likstr\u00f6m sv\u00e5rare att bryta<\/h2>\n<p>N\u00e4r kontakter \u00f6ppnar under last bildas en ljusb\u00e5ge. Vid v\u00e4xelstr\u00f6m passerar str\u00f6mmen noll 100 g\u00e5nger per sekund (50 Hz), och b\u00e5gen slocknar senast vid n\u00e4sta nollgenomg\u00e5ng. Likstr\u00f6m har ingen nollgenomg\u00e5ng. B\u00e5gen kan brinna vidare och f\u00f6rst\u00f6ra kontakterna. D\u00e4rf\u00f6r klarar ett rel\u00e4 som \u00e4r m\u00e4rkt 250 V AC ofta bara 30 V DC vid samma str\u00f6m.<\/p>\n<figure><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/scn-guide-rela-f2-sv.webp\" alt=\"Diagram: vid v\u00e4xelstr\u00f6m slocknar ljusb\u00e5gen n\u00e4r str\u00f6mmen passerar noll, vid likstr\u00f6m brinner b\u00e5gen vidare tills den sl\u00e4cks aktivt\" width=\"1520\" height=\"540\" loading=\"lazy\" decoding=\"async\"><figcaption>Vid AC slocknar ljusb\u00e5gen av sig sj\u00e4lv vid nollgenomg\u00e5ngen. Vid DC m\u00e5ste den sl\u00e4ckas aktivt.<\/figcaption><\/figure>\n<p>I batterisystem, elfordon och solcellsanl\u00e4ggningar anv\u00e4nds d\u00e4rf\u00f6r <b>h\u00f6gsp\u00e4nningskontaktorer f\u00f6r DC<\/b>, f\u00f6r 400\u20131 500 V. Kontakterna sitter i en hermetiskt t\u00e4t, gasfylld kammare av keramik, och magneter bl\u00e5ser ut b\u00e5gen. Vissa modeller bryter full str\u00f6m bara i en riktning. Ett batteri som b\u00e5de laddas och laddas ur beh\u00f6ver en dubbelriktad kontaktor. Halvledarkontaktorer f\u00f6r DC bryter helt utan ljusb\u00e5ge.<\/p>\n<h2>Tidsrel\u00e4er, \u00f6vervakningsrel\u00e4er och s\u00e4kerhetsrel\u00e4er<\/h2>\n<ul>\n<li><b>Tidsrel\u00e4<\/b> \u2013 f\u00f6rdr\u00f6jer till- eller fr\u00e5nslag, blinkar eller styr stj\u00e4rn-triangelstart av motorer. Exempel: efterg\u00e5ngstid f\u00f6r en fl\u00e4kt.<\/li>\n<li><b>\u00d6vervakningsrel\u00e4<\/b> \u2013 vaktar sp\u00e4nning, str\u00f6m, frekvens, fasf\u00f6ljd eller cos \u03c6 och l\u00f6ser ut n\u00e4r ett v\u00e4rde hamnar utanf\u00f6r gr\u00e4nsen. Exempel: frekvensvakt p\u00e5 ett reservkraftverk.<\/li>\n<li><b>S\u00e4kerhetsrel\u00e4<\/b> \u2013 \u00f6vervakar n\u00f6dstopp, skyddsgrindar och ljusrid\u00e5er. Det har tv\u00e5ngsstyrda kontakter och tv\u00e5 kanaler, och v\u00e4ljs efter den prestandaniv\u00e5 (PL enligt EN ISO 13849-1) som riskbed\u00f6mningen kr\u00e4ver.<\/li>\n<\/ul>\n<h2>Vilken ska du v\u00e4lja? Anv\u00e4ndningsexempel<\/h2>\n<div class=\"g-tbl\">\n<table>\n<thead>\n<tr>\n<th>Om du beh\u00f6ver \u2026<\/th>\n<th>V\u00e4lj<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>F\u00f6rst\u00e4rka en PLC-utg\u00e5ng till en ventil eller lampa<\/td>\n<td>Mellanrel\u00e4 eller I\/O-rel\u00e4 p\u00e5 DIN-skena<\/td>\n<\/tr>\n<tr>\n<td>Styra v\u00e4rme med m\u00e5nga kopplingar per minut<\/td>\n<td>SSR med nollgenomg\u00e5ng och kylfl\u00e4ns<\/td>\n<\/tr>\n<tr>\n<td>Starta och stoppa en trefasmotor<\/td>\n<td>Kontaktor dimensionerad f\u00f6r AC-3 och ett motorskydd<\/td>\n<\/tr>\n<tr>\n<td>Koppla in och bryta ett batteri p\u00e5 400\u20131 500 V DC<\/td>\n<td>H\u00f6gsp\u00e4nningskontaktor f\u00f6r DC<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<ul>\n<li><b>Fabrik<\/b> \u2013 mellanrel\u00e4er till magnetventiler, SSR f\u00f6r svetsbackar i f\u00f6rpackningsmaskiner, kontaktorer f\u00f6r transportband.<\/li>\n<li><b>Fordon och mobila maskiner<\/b> \u2013 huvudkontaktorer i eltruckar, elbussar och gruvmaskiner.<\/li>\n<li><b>Energi<\/b> \u2013 batterilager och solcellsanl\u00e4ggningar p\u00e5 1 000\u20131 500 V DC, frekvensvakter p\u00e5 generatorer.<\/li>\n<li><b>Infrastruktur<\/b> \u2013 pumpstationer med pumpv\u00e4xlingsrel\u00e4 och tidsrel\u00e4er i ventilation.<\/li>\n<li><b>Flyg och f\u00f6rsvar<\/b> \u2013 hermetiskt t\u00e4ta rel\u00e4er f\u00f6r \u221270 till +125 \u00b0C.<\/li>\n<li><b>Laboratorium och medicinteknik<\/b> \u2013 tysta SSR f\u00f6r v\u00e4rme i inkubatorer och analysutrustning.<\/li>\n<\/ul>\n<h2>Fem vanliga misstag<\/h2>\n<ol class=\"g-pit\">\n<li><b>SSR utan tillr\u00e4cklig kylfl\u00e4ns.<\/b> M\u00e4rkstr\u00f6mmen g\u00e4ller bara med r\u00e4tt kylning. R\u00e4kna med temperaturen inne i sk\u00e5pet.<\/li>\n<li><b>AC-m\u00e4rkt rel\u00e4 p\u00e5 DC.<\/b> M\u00e4rkningen 10 A 250 V AC s\u00e4ger inget om DC. Kontrollera DC-data i databladet.<\/li>\n<li><b>Fel brukskategori.<\/b> En kontaktor klarar mer str\u00f6m f\u00f6r resistiv last (AC-1) \u00e4n f\u00f6r motorer (AC-3). Dimensionera efter lasten.<\/li>\n<li><b>L\u00e4ckstr\u00f6mmen gl\u00f6ms bort.<\/b> Ett fr\u00e5nslaget SSR l\u00e4cker n\u00e5gra milliampere \u2013 nog f\u00f6r att en LED-lampa glimmar eller en PLC-ing\u00e5ng l\u00e4ser en etta.<\/li>\n<li><b>Ingen skyddskrets.<\/b> Induktiva laster ger sp\u00e4nningstoppar n\u00e4r de bryts, och lampor och kondensatorer ger h\u00f6ga inkopplingsstr\u00f6mmar. Anv\u00e4nd frihjulsdiod, RC-l\u00e4nk eller varistor.<\/li>\n<\/ol>\n<h2>Rel\u00e4er och kontaktorer hos SCN<\/h2>\n<p>Vi har mellanrel\u00e4er fr\u00e5n Mibbo och Tele Haase, halvledarrel\u00e4er fr\u00e5n Celduc, Mibbo och Nominal Controls, kylfl\u00e4nsar och tillbeh\u00f6r f\u00f6r SSR fr\u00e5n Celduc och h\u00f6gsp\u00e4nningskontaktorer f\u00f6r DC fr\u00e5n Gigavac och Rincon Power. Tidsrel\u00e4er och \u00f6vervakningsrel\u00e4er kommer fr\u00e5n Tele Haase, och hermetiska rel\u00e4er f\u00f6r flyg fr\u00e5n Leach.<\/p>\n<h3>Exempel ur v\u00e5rt sortiment<\/h3>\n<div class=\"g-prod\"><a class=\"g-pc\" href=\"https:\/\/scn.eu\/sv\/produkt\/sobr965560-th-sv\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2025\/01\/SOBR965560-TH.jpeg\" alt=\"Celduc SOBR965560-TH 2-fas Halvledarrel\u00e4 2x24A\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Celduc<\/span><span class=\"g-pn\">SOBR965560-TH 2-fas Halvledarrel\u00e4 2x24A<\/span><span class=\"g-pw\">Nyhet: tv\u00e5fasigt halvledarrel\u00e4 med nollgenomg\u00e5ng och push-in-plintar, 2 \u00d7 24 A vid 24\u2013600 V AC \u2013 f\u00f6r v\u00e4rmelaster.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/sv\/produkt\/gx16-sv\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2025\/01\/gx16.jpeg\" alt=\"Gigavac GX16 Kontaktor f\u00f6r chassimontering\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Gigavac<\/span><span class=\"g-pn\">GX16 Kontaktor f\u00f6r chassimontering<\/span><span class=\"g-pw\">Hermetiskt t\u00e4t kontaktor f\u00f6r chassimontering, IP67 och IP69K, f\u00f6r \u221255 till 85 \u00b0C.<\/span><\/a><a class=\"g-pc\" href=\"https:\/\/scn.eu\/sv\/produkt\/e1k-e3k-coupling-relays-sv\/\"><img loading=\"lazy\" src=\"https:\/\/scn.eu\/wp-content\/uploads\/2026\/10\/tele-haase-coup-main.webp\" alt=\"Tele Haase E1K \/ E3K mellanrel\u00e4er\" width=\"800\" height=\"800\" loading=\"lazy\" decoding=\"async\"><span class=\"g-pb\">Tele Haase<\/span><span class=\"g-pn\">E1K \/ E3K mellanrel\u00e4er<\/span><span class=\"g-pw\">Mellanrel\u00e4er f\u00f6r DIN-skena, 8 A vid 250 V, som skiljer PLC-utg\u00e5ngar fr\u00e5n lasten.<\/span><\/a><\/div>\n<div class=\"g-links\"><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/komponenter-sv\/relaer-och-uttag\/\">Rel\u00e4er och socklar<\/a><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/komponenter-sv\/solid-state-relays-ssr-sv\/\">Halvledarrel\u00e4er (SSR)<\/a><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/komponenter-sv\/power-contactors-sv\/\">Kontaktorer<\/a><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/komponenter-sv\/timing-relays-sv\/\">Tidsrel\u00e4er<\/a><a href=\"https:\/\/scn.eu\/sv\/produkt-kategori\/produkter-sv\/komponenter-sv\/monitoring-relays-sv\/\">\u00d6vervakningsrel\u00e4er<\/a><\/div>\n<div class=\"g-cta\">\n<p>Os\u00e4ker p\u00e5 om lasten kr\u00e4ver rel\u00e4, SSR eller kontaktor? Fr\u00e5ga en av v\u00e5ra ingenj\u00f6rer \u2013 du f\u00e5r svar inom 24 timmar.<\/p>\n<p><a href=\"https:\/\/scn.eu\/sv\/kontakt\/\">Fr\u00e5ga en ingenj\u00f6r<\/a><\/div>\n<h2>Vanliga fr\u00e5gor<\/h2>\n<details>\n<summary>Vad \u00e4r skillnaden mellan ett rel\u00e4 och en kontaktor?<\/summary>\n<p>B\u00e5da har en spole som drar mekaniska kontakter. En kontaktor \u00e4r byggd f\u00f6r st\u00f6rre str\u00f6mmar och har ofta tre huvudkontakter f\u00f6r trefas. Rel\u00e4er anv\u00e4nds fr\u00e4mst f\u00f6r styrsignaler och mindre laster.<\/p>\n<\/details>\n<details>\n<summary>Kan ett halvledarrel\u00e4 ers\u00e4tta en kontaktor?<\/summary>\n<p>Ofta, om lasten kopplas ofta och du kan kyla bort v\u00e4rmen. F\u00f6r motorer och d\u00e4r du vill ha ett luftgap i fr\u00e5nslaget l\u00e4ge \u00e4r en kontaktor oftast b\u00e4ttre.<\/p>\n<\/details>\n<details>\n<summary>Varf\u00f6r blir mitt halvledarrel\u00e4 varmt?<\/summary>\n<p>Halvledaren har ett sp\u00e4nningsfall p\u00e5 ungef\u00e4r 1\u20131,5 V, vilket ger 1\u20131,5 W v\u00e4rme per ampere. Utan kylfl\u00e4ns blir rel\u00e4et f\u00f6r varmt redan vid n\u00e5gra ampere.<\/p>\n<\/details>\n<details>\n<summary>Kan jag anv\u00e4nda ett AC-rel\u00e4 f\u00f6r likstr\u00f6m?<\/summary>\n<p>Bara inom de DC-data som st\u00e5r i databladet. De \u00e4r ofta mycket l\u00e4gre, eftersom en ljusb\u00e5ge vid DC \u00e4r sv\u00e5rare att sl\u00e4cka.<\/p>\n<\/details>\n<details>\n<summary>Vad \u00e4r ett mellanrel\u00e4?<\/summary>\n<p>Ett rel\u00e4 mellan styrsystemet och lasten. Det skiljer PLC-utg\u00e5ngen fr\u00e5n lasten och l\u00e5ter en svag utg\u00e5ng styra en st\u00f6rre str\u00f6m eller en annan sp\u00e4nning.<\/p>\n<\/details>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Ett rel\u00e4, ett halvledarrel\u00e4 (SSR) och en kontaktor sl\u00e5r alla till och fr\u00e5n en last med en liten styrsignal. Vilken du ska v\u00e4lja beror p\u00e5 str\u00f6m, sp\u00e4nning, hur ofta du kopplar och om lasten g\u00e5r p\u00e5 AC eller DC.<\/p>\n","protected":false},"author":11,"featured_media":8234075,"template":"","meta":{"_yoast_wpseo_focuskw":"kontaktor","_yoast_wpseo_metadesc":"Rel\u00e4, halvledarrel\u00e4 (SSR) eller kontaktor? 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