{"product_id":"surge-arrestor-20ka-2-4-pole-275v-385v-onesto-spd","title":"Surge Arrestor 20kA, 2-4 Pole, 275V\/385V | Onesto SPD","description":"\u003cp\u003eThe Onesto BY7-20T Surge Protection Device is a Class II (Type 2) surge arrestor rated at 20kA, designed to protect electrical installations, distribution boards and connected equipment from transient overvoltage caused by lightning strikes and switching surges. It is suitable for domestic, commercial and light industrial TN and TT power supply networks, and offers a visual pass\/fail status indicator so installers and maintenance teams can check protection status at a glance. Available in 2, 3 and 4 pole configurations for 275V or 385V systems, it is a practical mid-range choice for boards needing more protection than a standard 10kA unit.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Suitable for domestic, commercial and light industrial distribution board surge protection on TN\/TT networks\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 Available in 2, 3 and 4 pole versions\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\u003eStatus indicator:\u003c\/strong\u003e Green\/red indication window shows functional or failed status\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e 35mm DIN rail, IP20 enclosure\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3 style=\"color:#2C3892;\"\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e20kA maximum discharge current (8\/20µs) suited to properties with a higher exposure to surge events\u003c\/li\u003e\n\u003cli\u003eVisual green (functional) \/ red (failed) indication window means the device can be checked without removing it from the DIN rail\u003c\/li\u003e\n\u003cli\u003ePA66 UL94-V0 flame-retardant housing suited to enclosure and distribution board installation\u003c\/li\u003e\n\u003cli\u003eCompact DIN rail mounting saves space in distribution boards\u003c\/li\u003e\n\u003cli\u003eSuitable for TN and TT earthing systems\u003c\/li\u003e\n\u003cli\u003e2, 3 and 4 pole configurations to match single-phase or three-phase boards\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 board protection\u003c\/li\u003e\n\u003cli\u003eFarm and rural property protection where lightning exposure is higher\u003c\/li\u003e\n\u003cli\u003eIsolator and pump control panel protection\u003c\/li\u003e\n\u003cli\u003eProtection of sensitive electronic equipment against transient overvoltage\u003c\/li\u003e\n\u003cli\u003eUpgrading boards from a 10kA to a 20kA SPD\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\u003eBY7-20T\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\u003eMaximum continuous operating voltage (Uc)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e275V or 385V AC (select variant)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePoles available\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2P, 3P, 4P\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\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 BY7-20T Surge Protection Device (voltage and pole configuration 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 your board's earthing system (TN or TT) and system voltage (275V or 385V) before ordering.\u003c\/li\u003e\n\u003cli\u003eSelect the pole configuration (2P, 3P or 4P) that matches your distribution board and phase configuration.\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 pole configuration, and we will assist where possible.\u003c\/p\u003e","brand":"Onesto","offers":[{"title":"2P \/ 275V","offer_id":49515482841345,"sku":"BY7-20\/2-275T","price":658.9,"currency_code":"ZAR","in_stock":true},{"title":"2P \/ 385V","offer_id":49515482874113,"sku":"BY7-20\/2-385T","price":658.9,"currency_code":"ZAR","in_stock":true},{"title":"3P \/ 275V","offer_id":49515482906881,"sku":"BY7-20\/3-275T","price":951.0,"currency_code":"ZAR","in_stock":true},{"title":"3P \/ 385V","offer_id":49515482939649,"sku":"BY7-20\/3-385T","price":951.0,"currency_code":"ZAR","in_stock":true},{"title":"4P \/ 275V","offer_id":49515482972417,"sku":"BY7-20\/4-275T","price":1521.4,"currency_code":"ZAR","in_stock":true},{"title":"4P \/ 385V","offer_id":49515483005185,"sku":"BY7-20\/4-385T","price":1521.4,"currency_code":"ZAR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0723\/6924\/2369\/files\/BY7-60_7c468141-1a79-4b59-91e9-8efc8a185f58.png?v=1783163052","url":"https:\/\/www.zisabo.co.za\/products\/surge-arrestor-20ka-2-4-pole-275v-385v-onesto-spd","provider":"Zisabo","version":"1.0","type":"link"}