{"product_id":"rtsn400k3-automatic-transfer-switch-400-amps-277-480-3p-nema-3r-non-service-rated","title":"RTSN400K3 - Automatic Transfer Switch 400 Amps, 277\/480 3P, NEMA 3R, Non-Service Rated","description":"\u003cdiv class=\"container\"\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan\u003eCompact 400 Amp Automatic Transfer for 277\/480V Three-Phase Systems\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eRTSN400K3\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is a 400 Amp Automatic Transfer Switch (ATS) engineered to provide seamless automatic power source transition between utility and generator feeds. Designed for \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e277\/480 Volt, 3-Phase (3P) Wye\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e systems, this switch is ideal for small to mid-sized commercial facilities, critical infrastructure, and industrial applications requiring dependable backup power for lighting, HVAC, and process equipment.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan\u003eKey Specifications:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan\u003eAmperage:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 400 Amps\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan\u003eVoltage:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 277\/480 Volts, 3-Phase (3P), 4-Wire + Ground (Wye configuration)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan\u003eEnclosure Type:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e NEMA 3R (Rainproof, sleet-resistant – suitable for outdoor installation)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan\u003eRating:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Non-Service Rated (Requires upstream overcurrent protection; no internal main breaker)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan\u003eCore Features:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan\u003eFully Automatic Operation:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The microprocessor-based controller continuously monitors utility voltage and frequency. Upon utility failure, undervoltage, phase loss, or frequency deviation, it signals the generator to start, transfers the load to emergency power once stable, and automatically retransfers to utility when normal power is restored, followed by an adjustable engine cooldown cycle.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan\u003e277\/480V 3-Phase Wye Configuration:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Supports common commercial voltage levels – 480V three-phase for motors, pumps, compressors, and heavy equipment, plus 277V single-phase for energy-efficient fluorescent and LED lighting systems.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan\u003eNEMA 3R Outdoor Enclosure:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Heavy-gauge galvanized steel cabinet with a durable powder-coated finish. Provides rainproof and sleet-resistant protection, allowing for safe outdoor pad or wall mounting without requiring an additional electrical room or shelter.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan\u003eNon-Service Rated Design:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Cost-effective and space-efficient solution for installations where overcurrent protection is already provided by an upstream main circuit breaker or fused disconnect. Contains no integral main breaker, reducing cost and footprint.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan\u003eHigh Withstand Rating:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Engineered to coordinate with upstream protective devices, safely withstanding available fault currents without damage when properly protected.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan\u003eElectrically Operated \/ Mechanically Held:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Mechanically held contacts eliminate continuous coil power draw, reduce heat buildup, and ensure positive contact retention for reliable long-term performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan\u003eDigital Controller Features:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eLED status indicators (Source 1 Available, Source 2 Available, Load on Source 1\/2)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003ePush-button manual test and transfer (live or no-load test modes)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eProgrammable weekly generator exercise timer with day\/time selection\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eEvent logging and non-volatile fault memory\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eAdjustable voltage and frequency sensing thresholds\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eTime delays for engine start, transfer, retransfer, and cooldown (field adjustable)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan\u003eTypical Applications:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eSmall to mid-sized office buildings\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eRetail centers and strip malls\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eSchools and municipal facilities\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eWater pumping and booster stations\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eWastewater treatment plants\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eTelecommunications shelters and cell towers\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eSmall manufacturing facilities\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eAgricultural and farming operations\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan\u003eChurches and community centers\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e","brand":"Generac","offers":[{"title":"Default Title","offer_id":50794761126121,"sku":"Model #RTSN400K3","price":2619.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/4624\/8681\/files\/515Wx515H-RTSN400K3-Main-Product-Image-1200Wx1200H.jpg?v=1775229743","url":"https:\/\/themodernmanor.com\/products\/rtsn400k3-automatic-transfer-switch-400-amps-277-480-3p-nema-3r-non-service-rated","provider":"The Modern Manor","version":"1.0","type":"link"}