{"id":59241,"date":"2026-04-03T10:05:39","date_gmt":"2026-04-03T08:05:39","guid":{"rendered":"https:\/\/darpol.bydgoszcz.pl\/offer\/uncategorized\/syrena-niskotonowa-skn-z-systemem-przeciwzamarzaniowym-dl-30-027-05\/"},"modified":"2026-04-03T10:14:05","modified_gmt":"2026-04-03T08:14:05","slug":"warning-horn-low-note-s370hz-with-anti-freeze-system-dl-30-027-05","status":"publish","type":"product","link":"https:\/\/darpol.bydgoszcz.pl\/en\/offer\/rolling-stock\/locomotives\/warning-horn-low-note-s370hz-with-anti-freeze-system-dl-30-027-05\/","title":{"rendered":"Warning horn low note 370Hz with anti-freeze system DL-30-027-05"},"content":{"rendered":"<p>The SKN low-frequency warning siren with an anti-freeze system is a reliable warning device designed for railway applications, meeting the requirements of the Regulation of the Minister of Infrastructure of 18 July 2005. It guarantees effective sound signalling even in extreme weather conditions.<br \/>\nHow does it work?<br \/>\nCompressed air fed into the sound generator causes the diaphragms to vibrate, generating acoustic waves of a specific frequency. The anti-freeze system maintains the optimum temperature of the components, eliminating the risk of failure caused by freezing..<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Benefits:<\/strong><br \/>\n+ Reliability in all conditions \u2013 the built-in anti-freeze system prevents moisture build-up and the freezing of key components, ensuring continuous operation in winter.<br \/>\n+ Powerful warning signal \u2013 a low-frequency sound with a long range improves safety on and around the tracks.<br \/>\n+ Compliance with railway regulations \u2013 the device meets applicable standards, enabling its seamless integration into railway systems.<br \/>\n+ Simple and durable design \u2013 robust construction (horn + sound generator) ensures a long service life and low operating costs.<br \/>\n+ Effective pneumatic operation \u2013 the use of compressed air (490\u2013980 kPa) ensures the stable generation of sound waves at the required frequency.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Technical specifications:<\/strong><br \/>\nSiren type: Pneumatic<br \/>\nMaterial: steel, brass<br \/>\nFinish: powder-coated RAL 7001 (can be customised to customer requirements)<br \/>\nPower supply: 24V DC<br \/>\nRated power: 40W<br \/>\nOperating temperature: -30\u02daC \/ +70\u02daC<br \/>\nSupply air pressure: 490\u2013980 kPa<br \/>\nSound frequency: 370\u00b115 Hz<br \/>\nLength: 403 mm<br \/>\nPower connection thread size: G1\/2<br \/>\nWeight: 4,7 kg<\/p>\n<p>&nbsp;<\/p>\n<p>Product complies with standards: PN-EN 15153-2, PN-EN 50155<br \/>\nApplication: locomotives, electric multiple units (EMUs), diesel multiple units (DMUs), maintenance vehicles<\/p>\n<p>&nbsp;<\/p>\n<div style=\"clear:both\"><a href=\"javascript:window.print()\"><i class=\"fa fa-print\" aria-hidden=\"true\"><\/i> Print this page<\/a><\/div>","protected":false},"excerpt":{"rendered":"<p>The SKN low-frequency warning siren with an anti-freeze system is a reliable warning device designed for railway applications, meeting the requirements of the Regulation of the Minister of Infrastructure of 18 July 2005. It guarantees effective sound signalling even in extreme weather conditions. How does it work? Compressed air fed into the sound generator causes &hellip;<\/p>\n","protected":false},"featured_media":59236,"template":"","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false},"product_cat":[262,4156,8521,327,333,351],"product_tag":[9083,9085,9046,3483,7826,9078,9076,9075,9073,9067,9070,9072,9084,9082,9081,9074,9068,9079,9071,9069,4095,9048,9077,9066,9052,9053,9056,9062,9064,9080],"class_list":{"0":"post-59241","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-rolling-stock","7":"product_cat-nowosci-en","8":"product_cat-other-exterior-products","9":"product_cat-locomotives","10":"product_cat-emu-dmu","11":"product_cat-freight-cisterns-others","12":"product_tag-anti-freeze-system","13":"product_tag-audible-signal","14":"product_tag-bezpieczenstwo-kolejowe-en","15":"product_tag-darpol-en","16":"product_tag-darpol-bydgoszcz-en","17":"product_tag-darpol-railway-siren","18":"product_tag-darpol-siren","19":"product_tag-industrial-low-frequency-siren","20":"product_tag-locomotive-siren","21":"product_tag-low-frequency-siren","22":"product_tag-pneumatic-siren","23":"product_tag-railway-audible-signal","24":"product_tag-railway-equipment","25":"product_tag-railway-infrastructure","26":"product_tag-railway-safety","27":"product_tag-railway-safety-systems","28":"product_tag-railway-signal-siren","29":"product_tag-railway-siren","30":"product_tag-railway-warning-devices","31":"product_tag-siren-with-anti-freeze-system","32":"product_tag-skn-en","33":"product_tag-skn-darpol-en","34":"product_tag-skn-darpol-siren","35":"product_tag-skn-railway-siren","36":"product_tag-syrena-kolejowa-en","37":"product_tag-syrena-kolejowa-darpol-en","38":"product_tag-syrena-ostrzegawcza-en","39":"product_tag-system-przeciwzamarzaniowy-en","40":"product_tag-urzadzenia-kolejowe-en","41":"product_tag-warning-siren","43":"first","44":"onbackorder","45":"shipping-taxable","46":"product-type-simple"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Warning horn low note 370Hz with anti-freeze system DL-30-027-05 - Darpol Bydgoszcz<\/title>\n<meta name=\"description\" content=\"The SKN low-frequency siren with an anti-freeze system \u2013 a reliable warning device for the railways. It operates in all conditions, complies with standards and delivers a highly effective signal.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/darpol.bydgoszcz.pl\/en\/offer\/rolling-stock\/locomotives\/warning-horn-low-note-s370hz-with-anti-freeze-system-dl-30-027-05\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Warning horn low note 370Hz with anti-freeze system DL-30-027-05 - Darpol Bydgoszcz\" \/>\n<meta property=\"og:description\" content=\"The SKN low-frequency siren with an anti-freeze system \u2013 a reliable warning device for the railways. It operates in all conditions, complies with standards and delivers a highly effective signal.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/darpol.bydgoszcz.pl\/en\/offer\/rolling-stock\/locomotives\/warning-horn-low-note-s370hz-with-anti-freeze-system-dl-30-027-05\/\" \/>\n<meta property=\"og:site_name\" content=\"Darpol Bydgoszcz\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-03T08:14:05+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/darpol.bydgoszcz.pl\/wp-content\/uploads\/Syrena-niskotonowa-SKN-z-systemem-przeciwzamarzaniowym_DL-30-027-05.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1000\" \/>\n\t<meta property=\"og:image:height\" content=\"1000\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/darpol.bydgoszcz.pl\/en\/offer\/rolling-stock\/locomotives\/warning-horn-low-note-s370hz-with-anti-freeze-system-dl-30-027-05\/\",\"url\":\"https:\/\/darpol.bydgoszcz.pl\/en\/offer\/rolling-stock\/locomotives\/warning-horn-low-note-s370hz-with-anti-freeze-system-dl-30-027-05\/\",\"name\":\"Warning horn low note 370Hz with anti-freeze system DL-30-027-05 - Darpol Bydgoszcz\",\"isPartOf\":{\"@id\":\"https:\/\/darpol.bydgoszcz.pl\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/darpol.bydgoszcz.pl\/en\/offer\/rolling-stock\/locomotives\/warning-horn-low-note-s370hz-with-anti-freeze-system-dl-30-027-05\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/darpol.bydgoszcz.pl\/en\/offer\/rolling-stock\/locomotives\/warning-horn-low-note-s370hz-with-anti-freeze-system-dl-30-027-05\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/darpol.bydgoszcz.pl\/wp-content\/uploads\/Syrena-niskotonowa-SKN-z-systemem-przeciwzamarzaniowym_DL-30-027-05.png\",\"datePublished\":\"2026-04-03T08:05:39+00:00\",\"dateModified\":\"2026-04-03T08:14:05+00:00\",\"description\":\"The SKN low-frequency siren with an anti-freeze system \u2013 a reliable warning device for the railways. It operates in all conditions, complies with standards and delivers a highly effective signal.\",\"breadcrumb\":{\"@id\":\"https:\/\/darpol.bydgoszcz.pl\/en\/offer\/rolling-stock\/locomotives\/warning-horn-low-note-s370hz-with-anti-freeze-system-dl-30-027-05\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/darpol.bydgoszcz.pl\/en\/offer\/rolling-stock\/locomotives\/warning-horn-low-note-s370hz-with-anti-freeze-system-dl-30-027-05\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/darpol.bydgoszcz.pl\/en\/offer\/rolling-stock\/locomotives\/warning-horn-low-note-s370hz-with-anti-freeze-system-dl-30-027-05\/#primaryimage\",\"url\":\"https:\/\/darpol.bydgoszcz.pl\/wp-content\/uploads\/Syrena-niskotonowa-SKN-z-systemem-przeciwzamarzaniowym_DL-30-027-05.png\",\"contentUrl\":\"https:\/\/darpol.bydgoszcz.pl\/wp-content\/uploads\/Syrena-niskotonowa-SKN-z-systemem-przeciwzamarzaniowym_DL-30-027-05.png\",\"width\":1000,\"height\":1000,\"caption\":\"Syrena niskotonowa SKN z systemem przeciwzamarzaniowym DL-30-027-05\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/darpol.bydgoszcz.pl\/en\/offer\/rolling-stock\/locomotives\/warning-horn-low-note-s370hz-with-anti-freeze-system-dl-30-027-05\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Strona g\u0142\u00f3wna\",\"item\":\"https:\/\/darpol.bydgoszcz.pl\/en\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Oferta\",\"item\":\"https:\/\/darpol.bydgoszcz.pl\/oferta\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Warning horn low note 370Hz with anti-freeze system DL-30-027-05\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/darpol.bydgoszcz.pl\/#website\",\"url\":\"https:\/\/darpol.bydgoszcz.pl\/\",\"name\":\"Darpol Bydgoszcz\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/darpol.bydgoszcz.pl\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Warning horn low note 370Hz with anti-freeze system DL-30-027-05 - Darpol Bydgoszcz","description":"The SKN low-frequency siren with an anti-freeze system \u2013 a reliable warning device for the railways. It operates in all conditions, complies with standards and delivers a highly effective signal.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/darpol.bydgoszcz.pl\/en\/offer\/rolling-stock\/locomotives\/warning-horn-low-note-s370hz-with-anti-freeze-system-dl-30-027-05\/","og_locale":"en_US","og_type":"article","og_title":"Warning horn low note 370Hz with anti-freeze system DL-30-027-05 - Darpol Bydgoszcz","og_description":"The SKN low-frequency siren with an anti-freeze system \u2013 a reliable warning device for the railways. It operates in all conditions, complies with standards and delivers a highly effective signal.","og_url":"https:\/\/darpol.bydgoszcz.pl\/en\/offer\/rolling-stock\/locomotives\/warning-horn-low-note-s370hz-with-anti-freeze-system-dl-30-027-05\/","og_site_name":"Darpol Bydgoszcz","article_modified_time":"2026-04-03T08:14:05+00:00","og_image":[{"width":1000,"height":1000,"url":"https:\/\/darpol.bydgoszcz.pl\/wp-content\/uploads\/Syrena-niskotonowa-SKN-z-systemem-przeciwzamarzaniowym_DL-30-027-05.png","type":"image\/png"}],"twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/darpol.bydgoszcz.pl\/en\/offer\/rolling-stock\/locomotives\/warning-horn-low-note-s370hz-with-anti-freeze-system-dl-30-027-05\/","url":"https:\/\/darpol.bydgoszcz.pl\/en\/offer\/rolling-stock\/locomotives\/warning-horn-low-note-s370hz-with-anti-freeze-system-dl-30-027-05\/","name":"Warning horn low note 370Hz with anti-freeze system DL-30-027-05 - Darpol Bydgoszcz","isPartOf":{"@id":"https:\/\/darpol.bydgoszcz.pl\/#website"},"primaryImageOfPage":{"@id":"https:\/\/darpol.bydgoszcz.pl\/en\/offer\/rolling-stock\/locomotives\/warning-horn-low-note-s370hz-with-anti-freeze-system-dl-30-027-05\/#primaryimage"},"image":{"@id":"https:\/\/darpol.bydgoszcz.pl\/en\/offer\/rolling-stock\/locomotives\/warning-horn-low-note-s370hz-with-anti-freeze-system-dl-30-027-05\/#primaryimage"},"thumbnailUrl":"https:\/\/darpol.bydgoszcz.pl\/wp-content\/uploads\/Syrena-niskotonowa-SKN-z-systemem-przeciwzamarzaniowym_DL-30-027-05.png","datePublished":"2026-04-03T08:05:39+00:00","dateModified":"2026-04-03T08:14:05+00:00","description":"The SKN low-frequency siren with an anti-freeze system \u2013 a reliable warning device for the railways. It operates in all conditions, complies with standards and delivers a highly effective signal.","breadcrumb":{"@id":"https:\/\/darpol.bydgoszcz.pl\/en\/offer\/rolling-stock\/locomotives\/warning-horn-low-note-s370hz-with-anti-freeze-system-dl-30-027-05\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/darpol.bydgoszcz.pl\/en\/offer\/rolling-stock\/locomotives\/warning-horn-low-note-s370hz-with-anti-freeze-system-dl-30-027-05\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/darpol.bydgoszcz.pl\/en\/offer\/rolling-stock\/locomotives\/warning-horn-low-note-s370hz-with-anti-freeze-system-dl-30-027-05\/#primaryimage","url":"https:\/\/darpol.bydgoszcz.pl\/wp-content\/uploads\/Syrena-niskotonowa-SKN-z-systemem-przeciwzamarzaniowym_DL-30-027-05.png","contentUrl":"https:\/\/darpol.bydgoszcz.pl\/wp-content\/uploads\/Syrena-niskotonowa-SKN-z-systemem-przeciwzamarzaniowym_DL-30-027-05.png","width":1000,"height":1000,"caption":"Syrena niskotonowa SKN z systemem przeciwzamarzaniowym DL-30-027-05"},{"@type":"BreadcrumbList","@id":"https:\/\/darpol.bydgoszcz.pl\/en\/offer\/rolling-stock\/locomotives\/warning-horn-low-note-s370hz-with-anti-freeze-system-dl-30-027-05\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Strona g\u0142\u00f3wna","item":"https:\/\/darpol.bydgoszcz.pl\/en\/"},{"@type":"ListItem","position":2,"name":"Oferta","item":"https:\/\/darpol.bydgoszcz.pl\/oferta\/"},{"@type":"ListItem","position":3,"name":"Warning horn low note 370Hz with anti-freeze system DL-30-027-05"}]},{"@type":"WebSite","@id":"https:\/\/darpol.bydgoszcz.pl\/#website","url":"https:\/\/darpol.bydgoszcz.pl\/","name":"Darpol Bydgoszcz","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/darpol.bydgoszcz.pl\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"}]}},"_links":{"self":[{"href":"https:\/\/darpol.bydgoszcz.pl\/en\/wp-json\/wp\/v2\/product\/59241","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/darpol.bydgoszcz.pl\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/darpol.bydgoszcz.pl\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/darpol.bydgoszcz.pl\/en\/wp-json\/wp\/v2\/media\/59236"}],"wp:attachment":[{"href":"https:\/\/darpol.bydgoszcz.pl\/en\/wp-json\/wp\/v2\/media?parent=59241"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/darpol.bydgoszcz.pl\/en\/wp-json\/wp\/v2\/product_cat?post=59241"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/darpol.bydgoszcz.pl\/en\/wp-json\/wp\/v2\/product_tag?post=59241"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}