{"product_id":"combination-surge-arrestor-20ka-with-npe-1-1-3-1-module-onesto-spd","title":"Combination Surge Arrestor 20kA with NPE, 1+1 \u0026 3+1 Module | Onesto SPD","description":"\u003cp\u003eThe Onesto BY7-20 Combination Surge Protection Device is a compact, DIN rail mounted surge arrestor combining line and neutral-to-earth (NPE) protection in a single narrow module. Rated at 20kA, it is available in a 2-module 1+1 (single pole + neutral) configuration for single-phase boards, or a 4-module 3+1 (three pole + neutral) configuration for three-phase boards, at 275V or 385V. It is a practical, space-saving choice where board space is limited but full line and neutral surge protection is still required.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Suitable for TN\/TT distribution boards requiring combined line and neutral-to-earth protection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKey specification:\u003c\/strong\u003e 20kA maximum discharge current (Imax), Class II \/ Type 2 SPD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e 1+1 module (single-phase + neutral) or 3+1 module (three-phase + neutral)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 275V or 385V operating voltage options\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpace-saving:\u003c\/strong\u003e Combines line and NPE protection in one compact DIN rail unit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStatus indicator:\u003c\/strong\u003e Green\/red indication window shows functional or failed status\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3 style=\"color:#2C3892;\"\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCombines line surge protection and neutral-to-earth (NPE) protection in a single compact DIN rail module, saving board space compared to separate devices\u003c\/li\u003e\n\u003cli\u003e20kA maximum discharge current (Imax), 10kA nominal discharge current (In)\u003c\/li\u003e\n\u003cli\u003eVoltage protection level (Up) of approximately 1.5kV (1+1) or 2.0kV (3+1), depending on configuration\u003c\/li\u003e\n\u003cli\u003eVisual green (functional) \/ red (failed) indication window\u003c\/li\u003e\n\u003cli\u003ePA66 UL94-V0 flame-retardant housing, IP20 degree of protection\u003c\/li\u003e\n\u003cli\u003eSuitable for TN and TT earthing systems\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3 style=\"color:#2C3892;\"\u003eTypical Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDomestic and small commercial distribution boards with limited DIN rail space\u003c\/li\u003e\n\u003cli\u003eSingle-phase boards requiring 1+1 (line + neutral) protection\u003c\/li\u003e\n\u003cli\u003eThree-phase boards requiring 3+1 (three-phase + neutral) protection\u003c\/li\u003e\n\u003cli\u003eFarm and rural properties needing combined line\/neutral surge protection\u003c\/li\u003e\n\u003cli\u003eRetrofitting combined SPD protection into existing boards\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3 style=\"color:#2C3892;\"\u003eTechnical Specifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOnesto\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSeries\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBY7-20 Combination\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType classification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eClass II \/ Type 2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaximum discharge current (Imax, 8\/20µs)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e20kA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal discharge current (In, 8\/20µs)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10kA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaximum continuous operating voltage (Uc)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e275V or 385V (L-N), 255V (N-PE) (select variant)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVoltage protection level (Up)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 1.5kV (1+1 module) \/ 2.0kV (3+1 module)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCombination method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1+1 (2 module) or 3+1 (4 module)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStatus indicator\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGreen: functional \/ Red: failed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWiring capacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2.5mm² (L-N) \/ 4mm² (N-PE) for 1+1; 4mm² - 25mm² for 3+1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDegree of protection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIP20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower supply network\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTN, TT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInstallation method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e35mm DIN rail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHousing material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePA66 UL94-V0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAmbient temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-40°C to +80°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAmbient humidity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5% - 95%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAltitude\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≤2000m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStandard\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIEC61643-11:2011, EN61643-11:2012\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3 style=\"color:#2C3892;\"\u003eWhat's Included\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e1 x Onesto BY7-20 Combination Surge Protection Device (module configuration and voltage as selected)\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003ePlease note:\u003c\/strong\u003e DIN rail, distribution board wiring, circuit breakers and installation accessories are not included unless specifically listed above.\u003c\/p\u003e\u003ch3 style=\"color:#2C3892;\"\u003eInstallation \u0026amp; Compatibility Notes\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eConfirm whether your board is single-phase (use 1+1) or three-phase (use 3+1) before ordering.\u003c\/li\u003e\n\u003cli\u003eConfirm your board's earthing system (TN or TT) and system voltage (275V or 385V) before ordering.\u003c\/li\u003e\n\u003cli\u003eConfirm wiring capacity requirements against your board's cable sizes before installation.\u003c\/li\u003e\n\u003cli\u003eInstallation should be carried out by a suitably qualified electrician in line with local wiring regulations.\u003c\/li\u003e\n\u003cli\u003eCheck the status indicator periodically — a red window means the SPD has operated and must be replaced.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3 style=\"color:#2C3892;\"\u003eWarranty \u0026amp; Support\u003c\/h3\u003e\u003cp\u003eThis product is supplied with the applicable manufacturer or supplier warranty, subject to correct installation, correct application, and warranty terms.\u003c\/p\u003e\u003cp\u003eZisabo supplies quality plumbing, pump, filtration and electrical products with practical support to help customers choose the correct item for their application. If you are unsure whether this product is suitable, contact us before ordering and our team will assist where possible.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNeed help choosing?\u003c\/strong\u003e If you are unsure whether this product is suitable for your board, contact Zisabo with your system voltage, earthing type and phase configuration, and we will assist where possible.\u003c\/p\u003e","brand":"Onesto","offers":[{"title":"1+1 (1P+N) \/ 275V","offer_id":49515483824385,"sku":"BY7-20\/1+1-275","price":393.3,"currency_code":"ZAR","in_stock":true},{"title":"1+1 (1P+N) \/ 385V","offer_id":49515483857153,"sku":"BY7-20\/1+1-385","price":393.3,"currency_code":"ZAR","in_stock":true},{"title":"3+1 (3P+N) \/ 275V","offer_id":49515483889921,"sku":"BY7-20\/3+1-275","price":701.5,"currency_code":"ZAR","in_stock":true},{"title":"3+1 (3P+N) \/ 385V","offer_id":49515483922689,"sku":"BY7-20\/3+1-385","price":701.5,"currency_code":"ZAR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0723\/6924\/2369\/files\/BY7-20_fc1c9a00-70c1-4101-92bb-e5f6040b809e.png?v=1783162987","url":"https:\/\/www.zisabo.co.za\/products\/combination-surge-arrestor-20ka-with-npe-1-1-3-1-module-onesto-spd","provider":"Zisabo","version":"1.0","type":"link"}