{"product_id":"stvp-935s-3-phase-voltage-protector-automatic-transfer-switch","title":"STVP-935S 3-Phase Voltage Protector Auto Transfer Switch 40A–100A","description":"\n\u003ch2\u003eSTVP-935S 3-Phase Over\/Under Voltage Protector with Automatic Transfer Switch\u003c\/h2\u003e\n\u003cp\u003eKeep your three-phase electrical systems running smoothly with the \u003cstrong\u003eSTVP-935S Automatic Transfer Switch and Voltage Protector\u003c\/strong\u003e. Designed for industrial and commercial DIN-rail installations, this microcontroller-based device continuously monitors all three phases (L1, L2, L3) and automatically switches to a healthy phase whenever overvoltage, undervoltage, or phase-loss is detected — all without interrupting your connected load. Available in 40A, 63A, 80A, and 100A rated current options to suit a wide range of applications.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAutomatic Transfer Switch (ATS):\u003c\/strong\u003e Seamlessly switches to a healthy phase with priority order L1 \u0026gt; L2 \u0026gt; L3 — keeping your equipment running without manual intervention.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMicrocontroller-Based Intelligence:\u003c\/strong\u003e Precise, fast, and reliable phase monitoring via onboard microcontroller for consistent performance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOvervoltage Protection:\u003c\/strong\u003e Configurable overvoltage detection range of 230–300V to guard sensitive equipment against voltage surges.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUndervoltage Protection:\u003c\/strong\u003e Configurable undervoltage detection range of 140–210V to prevent damage from low-voltage conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOvercurrent Protection:\u003c\/strong\u003e Built-in overcurrent safeguard protects downstream equipment from excessive current draw.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePhase-Loss Detection:\u003c\/strong\u003e Automatically detects a missing phase and transfers to a functioning phase immediately.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLED Working Voltage Indicator:\u003c\/strong\u003e At-a-glance visual status display for quick diagnostics and system monitoring.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDIN Rail \/ Guide Rail Installation:\u003c\/strong\u003e Standard DIN rail mounting for easy integration into electrical panels and distribution boards.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Current Range:\u003c\/strong\u003e Available in 40A, 63A, 80A, and 100A versions to match your system's load requirements.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Storage Temperature Range:\u003c\/strong\u003e Rated for storage from -25°C to +55°C, suitable for a variety of environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n    \u003cth style=\"text-align:left; padding:8px; border:1px solid #ddd;\"\u003eParameter\u003c\/th\u003e\n    \u003cth style=\"text-align:left; padding:8px; border:1px solid #ddd;\"\u003eValue\u003c\/th\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eModel\u003c\/td\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eSTVP-935S\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eRated Working Current\u003c\/td\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e40A \/ 63A \/ 80A \/ 100A\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003ePower Terminals\u003c\/td\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eN, L1, L2, L3\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eOvervoltage Detection Range\u003c\/td\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e230V – 300V\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eUndervoltage Detection Range\u003c\/td\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e140V – 210V\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003ePhase Transfer Priority\u003c\/td\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eL1 \u0026gt; L2 \u0026gt; L3\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eStorage Temperature\u003c\/td\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e-25°C to +55°C\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eInstallation Type\u003c\/td\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eDIN Rail (Guide Rail)\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eCountry of Origin\u003c\/td\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eMade in China\u003c\/td\u003e\n  \u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eHow It Works\u003c\/h3\u003e\n\u003cp\u003eWhen any one of the three phases (L1, L2, or L3) experiences an overvoltage, undervoltage, or phase-loss event, the STVP-935S relay automatically disconnects from the affected phase and scans for the next healthy phase in priority order (L1 first, then L2, then L3). It then seamlessly switches your connected load to that healthy phase — all in real time, with no manual reset required.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× STVP-935S Over\/Under Voltage Protector \u0026amp; Automatic Transfer Switch\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePlease Note:\u003c\/strong\u003e Slight color variations may occur due to monitor settings. Allow 1mm–1cm dimensional tolerance due to manual measurement.\u003c\/p\u003e\n\n\u003cp\u003eFor guidance on electrical safety standards and best practices for electrical installations, refer to the \u003ca href=\"https:\/\/www.osha.gov\/electrical\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eOSHA Electrical Safety Guidelines\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the switching priority of the STVP-935S automatic transfer switch?\u003c\/h4\u003e\n\u003cp\u003eA: The STVP-935S uses a fixed priority order of L1 \u0026gt; L2 \u0026gt; L3. When the currently active phase experiences a fault (overvoltage, undervoltage, or phase loss), the unit automatically transfers to the next available healthy phase in this priority sequence — ensuring your equipment stays operational with minimal interruption.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Which current rating should I choose — 40A, 63A, 80A, or 100A?\u003c\/h4\u003e\n\u003cp\u003eA: Select the current rating that matches or slightly exceeds the maximum load current of your connected equipment. As a rule of thumb, the rated current of the protector should be at least equal to your circuit's maximum expected load current. Consult a qualified electrician if you are unsure of your system's load requirements.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can the STVP-935S be installed in a standard electrical panel?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The STVP-935S is designed for standard DIN rail (guide rail) mounting, making it straightforward to integrate into most electrical distribution boards and industrial control panels. Always have installation performed by a licensed electrician in accordance with local electrical codes.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does the STVP-935S protect against both high and low voltage simultaneously?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The device monitors all three phases simultaneously for both overvoltage (230–300V range, adjustable) and undervoltage (140–210V range, adjustable) conditions, as well as phase loss — providing comprehensive three-phase voltage protection in a single compact unit.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the switching priority of the STVP-935S automatic transfer switch?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The STVP-935S uses a fixed priority order of L1 \u0026gt; L2 \u0026gt; L3. 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The device monitors all three phases simultaneously for both overvoltage (230–300V range, adjustable) and undervoltage (140–210V range, adjustable) conditions, as well as phase loss — providing comprehensive three-phase voltage protection in a single compact unit.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/kujrmc-0q.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Fasteners \u0026 Electrical\", \"item\": \"https:\/\/kujrmc-0q.myshopify.com\/collections\/fasteners-electrical\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"STVP-935S 3-Phase Voltage Protector Auto Transfer Switch 40A–100A\", \"item\": \"https:\/\/kujrmc-0q.myshopify.com\/products\/stvp-935s-3-phase-voltage-protector-automatic-transfer-switch\"}]}\u003c\/script\u003e","brand":"Vue","offers":[{"title":"100A","offer_id":48747091558592,"sku":"567:200044550","price":212.99,"currency_code":"USD","in_stock":true},{"title":"80A","offer_id":48747091591360,"sku":"567:200661922","price":212.99,"currency_code":"USD","in_stock":true},{"title":"63A","offer_id":48747091624128,"sku":"567:203122981","price":212.99,"currency_code":"USD","in_stock":true},{"title":"40A","offer_id":48747091656896,"sku":"567:200002043","price":212.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0772\/9338\/7968\/files\/S8773e158eebd482fb0092cbb3e9035ech.webp?v=1786197754","url":"https:\/\/vueselect.com\/products\/stvp-935s-3-phase-voltage-protector-automatic-transfer-switch","provider":"Vue","version":"1.0","type":"link"}