{"product_id":"teco-rhu-10-30k2-thermal-overload-relay-amp-range-24-5-30a","title":"TECO RHU-10\/30K2 thermal overload relay, Amp range: 24.5 ~ 30A","description":"\u003cdiv class=\"koeed-container\"\u003e\r\n    \u003c!-- SEO Introduction --\u003e\r\n    \u003ch2 class=\"koeed-heading\"\u003eTECO RHU-10\/30K2 Thermal Overload Relay (24.5 ~ 30A)\u003c\/h2\u003e\r\n    \u003cp\u003eThe \u003cstrong\u003eTECO RHU-10\/30K2\u003c\/strong\u003e is a robust and reliable thermal overload relay (TOR) designed for the protection of AC induction motors against sustained overcurrents and phase failure conditions. Featuring an adjustable current dial range of \u003cstrong\u003e24.5A to 30A\u003c\/strong\u003e, this bimetallic relay seamlessly integrates into industrial motor control centers, ensuring your valuable rotating equipment is safeguarded from thermal damage.\u003c\/p\u003e\r\n    \u003cp\u003eAt Koeed, we provide genuine industrial control components to maintain the safety and uptime of your automated processes. \u003cem\u003eKeywords: TECO RHU-10, Thermal Overload Relay, 24.5-30A Relay, Motor Protection, TECO OLR, Bimetallic Overload.\u003c\/em\u003e\u003c\/p\u003e\r\n\r\n    \u003c!-- Technical Specifications --\u003e\r\n    \u003ch2 class=\"koeed-heading\"\u003eTechnical Specifications \u0026amp; Features\u003c\/h2\u003e\r\n    \u003cp\u003e\u003cem\u003eCritical FAE Note: The specifications below outline the standard capabilities of the TECO RHU-10 series. Always ensure that the physical pin arrangement aligns with your specific TECO magnetic contactor before mounting.\u003c\/em\u003e\u003c\/p\u003e\r\n    \r\n    \u003cdiv style=\"overflow-x: auto;\"\u003e\r\n        \u003ctable class=\"koeed-table\"\u003e\r\n            \u003cthead\u003e\r\n                \u003ctr\u003e\r\n                    \u003cth\u003eSpecification Category\u003c\/th\u003e\r\n                    \u003cth\u003eDetail \/ Parameter\u003c\/th\u003e\r\n                \u003c\/tr\u003e\r\n            \u003c\/thead\u003e\r\n            \u003ctbody\u003e\r\n                \u003ctr\u003e\r\n                    \u003ctd\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\r\n                    \u003ctd\u003eTECO (TECO Electric \u0026amp; Machinery Co., Ltd.)\u003c\/td\u003e\r\n                \u003c\/tr\u003e\r\n                \u003ctr\u003e\r\n                    \u003ctd\u003e\u003cstrong\u003eModel Series\u003c\/strong\u003e\u003c\/td\u003e\r\n                    \u003ctd\u003eRHU-10\u003c\/td\u003e\r\n                \u003c\/tr\u003e\r\n                \u003ctr\u003e\r\n                    \u003ctd\u003e\u003cstrong\u003eSpecific Part Number\u003c\/strong\u003e\u003c\/td\u003e\r\n                    \u003ctd\u003eRHU-10\/30K2\u003c\/td\u003e\r\n                \u003c\/tr\u003e\r\n                \u003ctr\u003e\r\n                    \u003ctd\u003e\u003cstrong\u003eAdjustable Current Range\u003c\/strong\u003e\u003c\/td\u003e\r\n                    \u003ctd\u003e24.5 A ~ 30 A\u003c\/td\u003e\r\n                \u003c\/tr\u003e\r\n                \u003ctr\u003e\r\n                    \u003ctd\u003e\u003cstrong\u003eProtection Mechanism\u003c\/strong\u003e\u003c\/td\u003e\r\n                    \u003ctd\u003eBimetallic thermal elements with phase loss sensitivity\u003c\/td\u003e\r\n                \u003c\/tr\u003e\r\n                \u003ctr\u003e\r\n                    \u003ctd\u003e\u003cstrong\u003eTrip Class\u003c\/strong\u003e\u003c\/td\u003e\r\n                    \u003ctd\u003eTypically Class 10 (Trips within 10 seconds at 600% of setting)\u003c\/td\u003e\r\n                \u003c\/tr\u003e\r\n                \u003ctr\u003e\r\n                    \u003ctd\u003e\u003cstrong\u003eAuxiliary Contacts\u003c\/strong\u003e\u003c\/td\u003e\r\n                    \u003ctd\u003e1 NO (Normally Open) + 1 NC (Normally Closed)\u003c\/td\u003e\r\n                \u003c\/tr\u003e\r\n                \u003ctr\u003e\r\n                    \u003ctd\u003e\u003cstrong\u003eReset Function\u003c\/strong\u003e\u003c\/td\u003e\r\n                    \u003ctd\u003eSelectable Manual (Hand) or Automatic reset modes\u003c\/td\u003e\r\n                \u003c\/tr\u003e\r\n                \u003ctr\u003e\r\n                    \u003ctd\u003e\u003cstrong\u003eAmbient Temperature Compensation\u003c\/strong\u003e\u003c\/td\u003e\r\n                    \u003ctd\u003eBuilt-in (Maintains accuracy across standard industrial temperature ranges)\u003c\/td\u003e\r\n                \u003c\/tr\u003e\r\n            \u003c\/tbody\u003e\r\n        \u003c\/table\u003e\r\n    \u003c\/div\u003e\r\n\r\n    \u003c!-- Application \u0026 Reliability --\u003e\r\n    \u003ch2 class=\"koeed-heading\"\u003eIndustrial Application \u0026amp; Motor Protection\u003c\/h2\u003e\r\n    \u003cp\u003eThe \u003cstrong\u003eRHU-10\/30K2\u003c\/strong\u003e acts as the thermal \"fuse\" of your motor control circuit. When a motor draws excessive current due to a mechanical jam, bearing failure, or phase imbalance, the internal bimetallic strips heat up and bend. This mechanical deflection eventually trips the auxiliary contacts, dropping out the magnetic contactor's coil and stopping the motor before its insulation melts. Properly setting the adjustment dial based on your motor's nameplate Full Load Amps (FLA) is crucial to balancing nuisance-free operation and stringent protection.\u003c\/p\u003e\r\n\r\n    \u003c!-- Koeed B2B Tool: Motor Overload Setting Calculator --\u003e\r\n    \u003ch2 class=\"koeed-heading\"\u003e🛠️ Koeed Engineer's Tool: Motor Overload Dial Setting Calculator\u003c\/h2\u003e\r\n    \u003cp\u003eA frequent question during commissioning is: \u003cem\u003e\"Where do I point the overload dial?\"\u003c\/em\u003e Use our frontend calculator to determine the recommended dial setting and the maximum allowable setting according to standard motor protection guidelines (e.g., NEC 430.32), based on your motor's Nameplate FLA and Service Factor (SF).\u003c\/p\u003e\r\n    \r\n    \u003cnoscript\u003e\r\n        \u003cp\u003e\u003cstrong\u003eSEO Content Note:\u003c\/strong\u003e For modern, ambient-compensated relays like the TECO RHU series, the dial is typically set exactly to the motor's nameplate FLA. The maximum allowed setting under NEC guidelines is 125% of FLA for motors with a Service Factor of 1.15 or greater, and 115% for SF 1.0. A JavaScript-enabled browser is required for real-time calculation and range validation.\u003c\/p\u003e\r\n    \u003c\/noscript\u003e\r\n\r\n    \u003cdiv class=\"koeed-tool-card\"\u003e\r\n        \u003clabel for=\"koeed-motor-fla\"\u003e\u003cstrong\u003eMotor Nameplate Full Load Amps (FLA):\u003c\/strong\u003e\u003c\/label\u003e\r\n        \u003cinput type=\"number\" id=\"koeed-motor-fla\" class=\"koeed-input\" placeholder=\"e.g., 26.5\" step=\"0.1\" min=\"1\"\u003e\r\n        \r\n        \u003clabel for=\"koeed-motor-sf\" style=\"margin-top: 10px; display: block;\"\u003e\u003cstrong\u003eMotor Service Factor (SF):\u003c\/strong\u003e\u003c\/label\u003e\r\n        \u003cselect id=\"koeed-motor-sf\" class=\"koeed-input\"\u003e\r\n            \u003coption value=\"1.15\"\u003e1.15 or greater (Standard Industrial)\u003c\/option\u003e\r\n            \u003coption value=\"1.0\"\u003e1.0 (No continuous overload capacity)\u003c\/option\u003e\r\n        \u003c\/select\u003e\r\n        \r\n        \u003cbutton class=\"koeed-btn\" onclick=\"koeedCalculateOverload()\" style=\"margin-top: 15px;\"\u003eCalculate Dial Setting\u003c\/button\u003e\r\n        \r\n        \u003cdiv id=\"koeed-result-box\" style=\"margin-top: 20px; display: none; background: #fff; padding: 15px; border-left: 4px solid #16c8c8;\"\u003e\r\n            \u003cp style=\"margin: 0; font-size: 1.1em;\"\u003e\u003cstrong\u003eRecommended Dial Setting:\u003c\/strong\u003e \u003cspan id=\"koeed-result-rec\" style=\"color: #0056b3; font-weight: bold; font-size: 1.2em;\"\u003e0\u003c\/span\u003e A\u003c\/p\u003e\r\n            \u003cp style=\"margin: 5px 0 0 0; font-size: 0.9em; color: #666;\"\u003e\u003cem\u003e(For ambient-compensated relays, set directly to Nameplate FLA)\u003c\/em\u003e\u003c\/p\u003e\r\n            \u003chr style=\"border: 0; border-top: 1px solid #eee; margin: 10px 0;\"\u003e\r\n            \u003cp style=\"margin: 0;\"\u003e\u003cstrong\u003eAbsolute Maximum Allowed Setting:\u003c\/strong\u003e \u003cspan id=\"koeed-result-max\" style=\"color: #d9534f; font-weight: bold;\"\u003e0\u003c\/span\u003e A\u003c\/p\u003e\r\n            \r\n            \u003cdiv id=\"koeed-range-warning\" style=\"margin-top: 15px; padding: 10px; background-color: #fff3cd; color: #856404; border: 1px solid #ffeeba; display: none;\"\u003e\r\n                \u003cstrong\u003eCompatibility Notice:\u003c\/strong\u003e The calculated FLA falls outside the 24.5A - 30A range of the TECO RHU-10\/30K2. Please select a different overload relay rating.\r\n            \u003c\/div\u003e\r\n            \u003cdiv id=\"koeed-range-success\" style=\"margin-top: 15px; padding: 10px; background-color: #d4edda; color: #155724; border: 1px solid #c3e6cb; display: none;\"\u003e\r\n                \u003cstrong\u003eCompatibility Confirmed:\u003c\/strong\u003e Your motor's FLA fits perfectly within the 24.5A - 30A adjustable range of this relay.\r\n            \u003c\/div\u003e\r\n        \u003c\/div\u003e\r\n    \u003c\/div\u003e\r\n\r\n    \u003c!-- Troubleshooting FAQ --\u003e\r\n    \u003ch2 class=\"koeed-heading\"\u003eTroubleshooting FAQ for Thermal Overload Relays\u003c\/h2\u003e\r\n    \u003cdiv class=\"koeed-faq-section\"\u003e\r\n        \u003ch3\u003eQ: How should I wire the auxiliary contacts (95\/96 and 97\/98)?\u003c\/h3\u003e\r\n        \u003cp\u003eA: The \u003cstrong\u003eNormally Closed (NC) contacts, typically terminals 95 and 96\u003c\/strong\u003e, must be wired in series with your magnetic contactor's coil circuit. When an overload occurs, these contacts open, dropping the power to the coil and stopping the motor. The \u003cstrong\u003eNormally Open (NO) contacts, terminals 97 and 98\u003c\/strong\u003e, close during an overload and are used to send a fault signal to a PLC or illuminate a red warning light on your control panel.\u003c\/p\u003e\r\n        \r\n        \u003ch3\u003eQ: The motor tripped on overload, but pressing the reset button does nothing. Why?\u003c\/h3\u003e\r\n        \u003cp\u003eA: A thermal overload relay operates on physical heat. The internal bimetallic strips must be given several minutes to cool down and return to their original shape before the mechanical latch can be reset. Wait 3 to 5 minutes, then press the reset button firmly. If it is set to \"Auto-Reset,\" it will reset itself once cooled, but use this mode with extreme caution to prevent unexpected motor restarts.\u003c\/p\u003e\r\n        \r\n        \u003ch3\u003eQ: Why does the relay trip immediately during motor startup, even though the running current is normal?\u003c\/h3\u003e\r\n        \u003cp\u003eA: Standard overload relays are typically \"Class 10,\" meaning they will trip in 10 seconds or less at 600% of their setting. If you are starting a high-inertia load (like a massive industrial fan or centrifuge), the motor draws high starting current (inrush) for longer than 10 seconds. In this scenario, you may need to upgrade to a \"Class 20\" or \"Class 30\" overload relay designed for heavy starting duties.\u003c\/p\u003e\r\n    \u003c\/div\u003e\r\n\u003c\/div\u003e\r\n\r\n\u003c!-- Koeed Custom Styles \u0026 Scripts --\u003e\r\n\u003cstyle\u003e\n    .koeed-container { width: 100%; font-family: inherit; line-height: 1.6; color: #333; }\n    .koeed-heading { color: #0056b3; border-bottom: 2px solid #16c8c8; padding-bottom: 8px; margin-top: 30px; }\n    .koeed-table { width: 100%; border-collapse: collapse; margin-bottom: 20px; }\n    .koeed-table th, .koeed-table td { border: 1px solid #eeeeee; padding: 12px; text-align: left; }\n    .koeed-table tr:nth-child(even) { background-color: #fafafa; }\n    .koeed-table tr:nth-child(odd) { background-color: #f4fcfc; }\n    .koeed-table th { background-color: #0056b3; color: white; }\n    .koeed-tool-card { border: 1px solid #eeeeee; padding: 25px; background: #fafafa; border-top: 4px solid #16c8c8; box-shadow: 0 2px 5px rgba(0,0,0,0.05); }\n    .koeed-input { padding: 10px; border: 1px solid #ccc; width: 100%; box-sizing: border-box; font-size: 16px; margin-top: 5px; }\n    .koeed-btn { background-color: #16c8c8; color: white; border: none; padding: 12px 24px; font-size: 16px; cursor: pointer; font-weight: bold; transition: background-color 0.3s ease; }\n    .koeed-btn:hover { background-color: #0056b3; }\n    .koeed-faq-section h3 { color: #333; margin-top: 20px; font-size: 1.1em; }\n    .koeed-faq-section p { margin-top: 5px; color: #555; }\n\u003c\/style\u003e\r\n\r\n\u003cscript\u003e\r\n    function koeedCalculateOverload() {\r\n        var flaInput = parseFloat(document.getElementById(\"koeed-motor-fla\").value);\r\n        var sfInput = parseFloat(document.getElementById(\"koeed-motor-sf\").value);\r\n        \r\n        var resultBox = document.getElementById(\"koeed-result-box\");\r\n        var recSpan = document.getElementById(\"koeed-result-rec\");\r\n        var maxSpan = document.getElementById(\"koeed-result-max\");\r\n        var warningDiv = document.getElementById(\"koeed-range-warning\");\r\n        var successDiv = document.getElementById(\"koeed-range-success\");\r\n\r\n        if(flaInput \u003e 0) {\r\n            \/\/ Modern ambient compensated relays recommend setting directly to FLA\r\n            var recommendedSetting = flaInput;\r\n            \r\n            \/\/ NEC Max allowable calculation based on Service Factor\r\n            var maxSetting = 0;\r\n            if (sfInput \u003e= 1.15) {\r\n                maxSetting = flaInput * 1.25;\r\n            } else {\r\n                maxSetting = flaInput * 1.15;\r\n            }\r\n            \r\n            recSpan.innerText = recommendedSetting.toLocaleString('en-US', {maximumFractionDigits: 1});\r\n            maxSpan.innerText = maxSetting.toLocaleString('en-US', {maximumFractionDigits: 1});\r\n            \r\n            \/\/ Relay specific range validation: 24.5A to 30A\r\n            var relayMin = 24.5;\r\n            var relayMax = 30.0;\r\n            \r\n            warningDiv.style.display = \"none\";\r\n            successDiv.style.display = \"none\";\r\n            \r\n            if(flaInput \u003e= relayMin \u0026\u0026 flaInput \u003c= relayMax) {\r\n                successDiv.style.display = \"block\";\r\n            } else {\r\n                warningDiv.style.display = \"block\";\r\n            }\r\n            \r\n            resultBox.style.display = \"block\";\r\n        } else {\r\n            alert(\"Please enter a valid, positive number for the Motor FLA.\");\r\n        }\r\n    }\r\n\u003c\/script\u003e\r\n\r\n\u003c!-- JSON-LD Structured Data for SEO --\u003e\r\n\u003cscript type=\"application\/ld+json\"\u003e\r\n[\r\n  {\r\n    \"@context\": \"https:\/\/schema.org\",\r\n    \"@type\": \"FAQPage\",\r\n    \"mainEntity\": [\r\n      {\r\n        \"@type\": \"Question\",\r\n        \"name\": \"How should I wire the auxiliary contacts (95\/96 and 97\/98) on the TECO overload relay?\",\r\n        \"acceptedAnswer\": {\r\n          \"@type\": \"Answer\",\r\n          \"text\": \"The Normally Closed (NC) contacts (95\/96) must be wired in series with the contactor coil to shut down the motor during a fault. The Normally Open (NO) contacts (97\/98) are used to signal a PLC or alarm light.\"\r\n        }\r\n      },\r\n      {\r\n        \"@type\": \"Question\",\r\n        \"name\": \"The motor tripped on overload, but pressing the reset button does nothing. Why?\",\r\n        \"acceptedAnswer\": {\r\n          \"@type\": \"Answer\",\r\n          \"text\": \"The bimetallic strips inside the relay need physical time to cool down. Wait 3 to 5 minutes before attempting to press the reset button. If set to auto-reset, it will reset itself once cooled.\"\r\n        }\r\n      },\r\n      {\r\n        \"@type\": \"Question\",\r\n        \"name\": \"Why does the relay trip immediately during motor startup, even though the running current is normal?\",\r\n        \"acceptedAnswer\": {\r\n          \"@type\": \"Answer\",\r\n          \"text\": \"Standard Class 10 relays trip in 10 seconds under heavy starting current. If you have a high-inertia load (like a large fan), the startup time may exceed 10 seconds, requiring an upgrade to a Class 20 overload relay.\"\r\n        }\r\n      }\r\n    ]\r\n  },\r\n  {\r\n    \"@context\": \"https:\/\/schema.org\",\r\n    \"@type\": \"WebApplication\",\r\n    \"name\": \"Koeed Motor Overload Dial Setting Calculator\",\r\n    \"url\": \"https:\/\/www.koeed.com\",\r\n    \"description\": \"An industrial tool to calculate the recommended thermal overload dial setting and maximum allowable NEC limit based on a motor's Nameplate Full Load Amps (FLA) and Service Factor.\",\r\n    \"applicationCategory\": \"EngineeringApplication\",\r\n    \"operatingSystem\": \"All\",\r\n    \"browserRequirements\": \"Requires JavaScript\"\r\n  }\r\n]\r\n\u003c\/script\u003e","brand":"TECO","offers":[{"title":"Default Title","offer_id":46021512331449,"sku":"287108321470","price":49.63,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0268\/8476\/7929\/files\/1_65f54e26-d789-4499-895f-105880bf508c.webp?v=1778750501","url":"https:\/\/koeed.com\/sr\/products\/teco-rhu-10-30k2-thermal-overload-relay-amp-range-24-5-30a","provider":"KOEED","version":"1.0","type":"link"}