{"product_id":"new-teco-rhu-10-4k1-thermal-overload-relay-amp-range-2-9-4a","title":"TECO RHU-10\/4K1 Thermal Overload Relay, 2.9-4A Amp Range, High-Performance Overload Protection for Industrial and Residential Use","description":"\u003cdiv class=\"koeed-container\" style=\"width: 100%; box-sizing: border-box; color: #333333; line-height: 1.6;\"\u003e\n  \n  \u003c!-- 1. Engineer's Quick Brief --\u003e\n  \u003ch2\u003eEngineer's Quick Brief\u003c\/h2\u003e\n  \u003cul style=\"list-style-type: disc; padding-left: 20px; margin-bottom: 25px;\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePrecision Motor Protection:\u003c\/strong\u003e Specially engineered for 3-phase AC motors with full-load currents matching the adjustable 2.9A to 4.0A bi-metallic thermal strip range.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePhase-Failure Sensitivity:\u003c\/strong\u003e Features a differential mechanism providing advanced protection against single-phasing and phase unbalance, preventing localized winding burnout.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFlexible Reset Modes:\u003c\/strong\u003e Equipped with a manual\/automatic reset selector and isolated 1NO + 1NC auxiliary contacts for seamless integration into control circuits and fault signaling loops.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003c!-- 2. SEO Introduction --\u003e\n  \u003ch2\u003eTECO RHU-10\/4K1 Thermal Overload Relay\u003c\/h2\u003e\n  \u003cp style=\"margin-bottom: 20px;\"\u003e\n    The \u003cstrong\u003eTECO RHU-10\/4K1\u003c\/strong\u003e is an industrial-grade, bi-metallic \u003cstrong\u003ethermal overload relay\u003c\/strong\u003e designed to provide reliable, inverse-time delay protection for low-voltage AC motors. Operating within an adjustable current setting range of \u003cstrong\u003e2.9A to 4.0A\u003c\/strong\u003e, this high-performance protection device mounts directly to compatible TECO mini contactors or installs independently via standalone brackets. Featuring built-in ambient temperature compensation and phase-loss protection mechanisms, the RHU-10\/4K1 acts as a critical line of defense in automated pump controls, HVAC air handlers, conveyor drives, and residential machinery lines by interrupting the contactor control coil circuit before damaging overcurrent conditions destroy stator insulation.\n  \u003c\/p\u003e\n\n  \u003c!-- 3. Technical Specifications --\u003e\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003cdiv style=\"overflow-x: auto; margin-bottom: 25px;\"\u003e\n    \u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #eeeeee; text-align: left;\"\u003e\n      \u003cthead\u003e\n        \u003ctr style=\"background-color: #16c8c8; color: #ffffff;\"\u003e\n          \u003cth style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eEngineering Parameter\u003c\/th\u003e\n          \u003cth style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eSpecification Value\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr style=\"background-color: #fafafa;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e\u003cstrong\u003eBrand \/ Manufacturer\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eTECO Electric \u0026amp; Machinery Co., Ltd.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e\u003cstrong\u003eModel Series\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eRHU-10 \/ 4K1\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #fafafa;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e\u003cstrong\u003eRelay Type\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eBi-metallic Thermal Overload Relay\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e\u003cstrong\u003eCurrent Adjustment Range\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e2.9 A to 4.0 A\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #fafafa;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e\u003cstrong\u003eRated Insulation Voltage (Ui)\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e690 V AC\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e\u003cstrong\u003eRated Impulse Withstand Voltage (Uimp)\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e6 kV\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #fafafa;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e\u003cstrong\u003eOverload Trip Class\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eClass 10A (Trips within 2-10s at 7.2 times setting current)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e\u003cstrong\u003eAuxiliary Contact Configuration\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e1 NO (Normally Open) + 1 NC (Normally Closed)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #fafafa;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e\u003cstrong\u003eAmbient Temperature Compensation\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding: -10px to +40px;\"\u003e-10°C to +40°C (No Derating)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e\u003cstrong\u003eReset and Test Functions\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eManual\/Auto Reset Selector, Test Button, Trip Indicator Bar\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- 4. Application Matrix --\u003e\n  \u003ch2\u003eApplication Matrix \u0026amp; Industrial Use Cases\u003c\/h2\u003e\n  \u003cdiv style=\"overflow-x: auto; margin-bottom: 25px;\"\u003e\n    \u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #eeeeee; text-align: left;\"\u003e\n      \u003cthead\u003e\n        \u003ctr style=\"background-color: #16c8c8; color: #ffffff;\"\u003e\n          \u003cth style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eDeployment Target\u003c\/th\u003e\n          \u003cth style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eEngineering Integration Function\u003c\/th\u003e\n          \u003cth style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eSystem Level Benefit\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr style=\"background-color: #fafafa;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e\u003cstrong\u003eSmall Industrial Pumps \u0026amp; Fans\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eMonitors running currents of 1.1kW to 1.5kW 3-phase motors against impeller blockages.\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003ePrevents winding degradation caused by continuous running stall conditions.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e\u003cstrong\u003ePackaging Conveyor Lines\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eInterrupts the main contactor coil when mechanical jamming causes an unexpected amperage spike.\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eProtects transmission gears and motor assemblies from mechanical overload distortion.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #fafafa;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e\u003cstrong\u003eResidential HVAC Air Handlers\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eActs as thermal memory protective hardware inside regional sub-panels under erratic power grid drops.\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eMitigates phase unbalance threats common in remote or residential branch lines.\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- 5. Koeed B2B Tool (Interactive Tool) --\u003e\n  \u003ch2\u003eQuick Insights: Thermal Overload Setting \u0026amp; Trip Calculator\u003c\/h2\u003e\n  \u003cp style=\"font-size: 0.95em; color: #666666; margin-bottom: 15px;\"\u003e\n    For control panel builders and site maintenance electricians: Input your motor's nameplate data to verify the recommended dial calibration setting and estimate the cold-start trip time curve for the TECO RHU-10\/4K1.\n  \u003c\/p\u003e\n  \n  \u003cdiv class=\"koeed-tool-box\" style=\"border: 2px solid #16c8c8; padding: 20px; border-radius: 4px; margin-bottom: 25px; background-color: #fafafa;\"\u003e\n    \u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 15px; margin-bottom: 15px;\"\u003e\n      \u003cdiv style=\"flex: 1; min-width: 180px;\"\u003e\n        \u003clabel style=\"display: block; font-weight: bold; margin-bottom: 5px;\"\u003eMotor Full-Load Current (FLA):\u003c\/label\u003e\n        \u003cinput type=\"number\" id=\"koeed-motor-fla\" value=\"3.2\" min=\"2.5\" max=\"4.5\" step=\"0.1\" style=\"width: 100%; padding: 8px; border: 1px solid #cccccc; border-radius: 4px; box-sizing: border-box;\"\u003e\n      \u003c\/div\u003e\n      \u003cdiv style=\"flex: 1; min-width: 180px;\"\u003e\n        \u003clabel style=\"display: block; font-weight: bold; margin-bottom: 5px;\"\u003eAmbient Temperature:\u003c\/label\u003e\n        \u003cselect id=\"koeed-ambient-temp\" style=\"width: 100%; padding: 8px; border: 1px solid #cccccc; border-radius: 4px;\"\u003e\n          \u003coption value=\"1.0\"\u003eStandard Operation (≤ 40°C)\u003c\/option\u003e\n          \u003coption value=\"1.1\"\u003eElevated Temperature (45°C - 50°C)\u003c\/option\u003e\n          \u003coption value=\"0.9\"\u003eCold Room Environment (\u0026lt; 10°C)\u003c\/option\u003e\n        \u003c\/select\u003e\n      \u003c\/div\u003e\n      \u003cdiv style=\"flex: 1; min-width: 180px;\"\u003e\n        \u003clabel style=\"display: block; font-weight: bold; margin-bottom: 5px;\"\u003eSimulated Fault Current (Amps):\u003c\/label\u003e\n        \u003cinput type=\"number\" id=\"koeed-fault-amps\" value=\"15.0\" min=\"3.0\" max=\"30.0\" step=\"0.5\" style=\"width: 100%; padding: 8px; border: 1px solid #cccccc; border-radius: 4px; box-sizing: border-box;\"\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n    \n    \u003cbutton type=\"button\" onclick=\"koeedCalculateOverload()\" style=\"background-color: #0056B3; color: #ffffff; border: none; padding: 10px 20px; border-radius: 4px; font-weight: bold; cursor: pointer;\"\u003eCalculate Settings \u0026amp; Trip Speed\u003c\/button\u003e\n    \n    \u003cdiv id=\"koeed-relay-results\" style=\"margin-top: 15px; padding: 15px; background-color: #ffffff; border: 1px solid #eeeeee; display: none;\"\u003e\n      \u003ch3 style=\"margin-top: 0; color: #0056B3;\"\u003eComputed Protection Profile\u003c\/h3\u003e\n      \u003cp style=\"margin: 5px 0;\"\u003e\u003cstrong\u003eTarget Dial Dial Adjustment Setting:\u003c\/strong\u003e \u003cspan id=\"koeed-rec-setting\"\u003e0\u003c\/span\u003e A\u003c\/p\u003e\n      \u003cp style=\"margin: 5px 0;\"\u003e\u003cstrong\u003eCurrent Range Status Evaluation:\u003c\/strong\u003e \u003cspan id=\"koeed-range-status\"\u003e0\u003c\/span\u003e\u003c\/p\u003e\n      \u003cp style=\"margin: 5px 0;\"\u003e\u003cstrong\u003eFault Severity Ratio (I \/ I_setting):\u003c\/strong\u003e \u003cspan id=\"koeed-severity-ratio\"\u003e0\u003c\/span\u003e x\u003c\/p\u003e\n      \u003cp style=\"margin: 5px 0;\"\u003e\u003cstrong\u003eEstimated Class 10A Cold Trip Delay:\u003c\/strong\u003e \u003cspan id=\"koeed-trip-time\"\u003e0\u003c\/span\u003e seconds\u003c\/p\u003e\n      \u003cdiv id=\"koeed-relay-alert\" style=\"margin-top: 10px; padding: 8px; border-radius: 4px; font-weight: bold; display: none;\"\u003e\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cnoscript\u003e\n    \u003cdiv style=\"border: 1px solid #ff0000; padding: 10px; margin-bottom: 25px; background-color: #fff0f0;\"\u003e\n      \u003cstrong\u003eJavaScript Requirement Notice:\u003c\/strong\u003e For quick manual assessment: The TECO RHU-10\/4K1 dial adjustment must be set exactly to the motor's rated Full-Load Amperage (FLA) for standard Service Factor 1.15 applications. Under standard Class 10A parameters, a fault current of 7.2 times the set value triggers a thermal breakdown break between 2 and 10 seconds.\n    \u003c\/div\u003e\n  \u003c\/noscript\u003e\n\n  \u003cscript\u003e\n    function koeedCalculateOverload() {\n      var fla = parseFloat(document.getElementById('koeed-motor-fla').value) || 0;\n      var tempFactor = parseFloat(document.getElementById('koeed-ambient-temp').value) || 1.0;\n      var faultAmps = parseFloat(document.getElementById('koeed-fault-amps').value) || 0;\n      \n      \/\/ Recommended Setting considers ambient adjustment factor\n      var recommendedSetting = fla * tempFactor;\n      \n      document.getElementById('koeed-rec-setting').innerText = recommendedSetting.toFixed(2);\n      \n      var rangeStatusSpan = document.getElementById('koeed-range-status');\n      var alertDiv = document.getElementById('koeed-relay-alert');\n      alertDiv.style.display = 'block';\n      \n      if (recommendedSetting \u003c 2.9 || recommendedSetting \u003e 4.0) {\n        rangeStatusSpan.innerHTML = '\u003cspan style=\"color:#ff0000; font-weight:bold;\"\u003eOUT OF BOUNDS\u003c\/span\u003e';\n        alertDiv.style.backgroundColor = '#fff0f0';\n        alertDiv.style.color = '#ff0000';\n        alertDiv.style.border = '1px solid #ff0000';\n        alertDiv.innerText = '🚨 MODEL SELECTION ERROR: The required setting profile falls outside the 2.9A - 4.0A physical limits of the RHU-10\/4K1. You must select an alternative frame size.';\n        document.getElementById('koeed-severity-ratio').innerText = \"N\/A\";\n        document.getElementById('koeed-trip-time').innerText = \"N\/A\";\n      } else {\n        rangeStatusSpan.innerHTML = '\u003cspan style=\"color:#006666; font-weight:bold;\"\u003eCOMPATIBLE (Within 2.9A - 4.0A)\u003c\/span\u003e';\n        \n        var ratio = faultAmps \/ recommendedSetting;\n        document.getElementById('koeed-severity-ratio').innerText = ratio.toFixed(1);\n        \n        var tripTime = 0;\n        if (ratio \u003c= 1.05) {\n          tripTime = Infinity;\n          document.getElementById('koeed-trip-time').innerText = \"Continuous (No Trip)\";\n          alertDiv.style.backgroundColor = '#f4fcfc';\n          alertDiv.style.color = '#006666';\n          alertDiv.style.border = '1px solid #16c8c8';\n          alertDiv.innerText = '✅ NORMAL OPERATION: Current is within the non-tripping threshold layout.';\n        } else {\n          \/\/ Empirical curve estimation for standard Class 10A thermal bi-metal strips\n          if (ratio \u003e= 7.2) {\n            tripTime = 6; \/\/ Standard center point for Class 10A at 7.2x\n          } else if (ratio \u003e= 3.0) {\n            tripTime = 120 \/ (ratio - 1); \n          } else {\n            tripTime = 480 \/ (ratio - 1);\n          }\n          \n          document.getElementById('koeed-trip-time').innerText = Math.round(tripTime) + \" s\";\n          \n          alertDiv.style.backgroundColor = '#fff9e6';\n          alertDiv.style.color = '#b58105';\n          alertDiv.style.border = '1px solid #ffeeba';\n          alertDiv.innerText = '⚠️ TRIP SIMULATION ACTIVE: Deflection ratio will initiate circuit separation. Ensure the auxiliary NC terminal 95-96 is correctly integrated in series with the contactor coil.';\n        }\n      }\n      \n      document.getElementById('koeed-relay-results').style.display = 'block';\n    }\n  \u003c\/script\u003e\n\n  \u003c!-- 6. Troubleshooting \u0026 FAQ --\u003e\n  \u003ch2\u003eCommissioning \u0026amp; Electrical Troubleshooting FAQ\u003c\/h2\u003e\n  \u003cdiv style=\"margin-bottom: 25px;\"\u003e\n    \u003cp style=\"margin-bottom: 10px;\"\u003e\u003cstrong\u003eQ1: What is the mechanical difference between selecting Manual (H) vs Automatic (A) reset mode?\u003c\/strong\u003e\u003c\/p\u003e\n    \u003cp style=\"margin-bottom: 15px; padding-left: 15px; border-left: 3px solid #16c8c8;\"\u003e\n      A1: In Manual Reset mode (factory default, blue pin depressed), once a trip occurs, an technician must physically inspect the hardware and press the reset plunger after the bimetal strips have cooled. In Automatic Reset mode (pin turned counter-clockwise), the internal mechanical latch resets autonomously as the strip returns to its flat state. \u003cem\u003eWarning: Do not use Automatic mode in automated restarting architectures if a sudden restart poses mechanical hazards to staff.\u003c\/em\u003e\n    \u003c\/p\u003e\n    \n    \u003cp style=\"margin-bottom: 10px;\"\u003e\u003cstrong\u003eQ2: The relay trips during high inertia start cycles even though the running current is below 4A. How do I solve this?\u003c\/strong\u003e\u003c\/p\u003e\n    \u003cp style=\"margin-bottom: 15px; padding-left: 15px; border-left: 3px solid #16c8c8;\"\u003e\n      A2: TECO RHU-10\/4K1 conforms to Class 10A tripping specifications. If the machinery exhibits a long acceleration curve (e.g., heavy fan blades or high-viscosity mixers) exceeding 10 seconds under locked-rotor current levels, the bi-metal strip accumulates critical thermal deflection before dropping to steady-state operational speed. Consider utilizing a bypass starting circuit or moving to a Class 20\/30 heavy-duty overload protection layout.\n    \u003c\/p\u003e\n    \n    \u003cp style=\"margin-bottom: 10px;\"\u003e\u003cstrong\u003eQ3: How do I test the internal auxiliary contact integrity without generating an actual thermal overload fault?\u003c\/strong\u003e\u003c\/p\u003e\n    \u003cp style=\"margin-bottom: 15px; padding-left: 15px; border-left: 3px solid #16c8c8;\"\u003e\n      A3: Pull or slide the integrated test indicator pin sharply outward using an isolated alignment tool. This mechanical displacement mimics a thermal trip condition, causing the NC contacts (95-96) to split open and the NO contacts (97-98) to snap closed. The orange flag indicator should display in the visual status window. Pressing the blue reset button restores the original circuit paths.\n    \u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- 7. Cross-Reference \u0026 Selection Guide --\u003e\n  \u003ch3\u003eCross-Reference Guide\u003c\/h3\u003e\n  \u003cp style=\"margin-bottom: 15px;\"\u003e\n    The \u003cstrong\u003eTECO RHU-10\/4K1\u003c\/strong\u003e aligns with precision modular motor branch architectures. When adjusting sourcing logistics or performing emergency field replacements, consider the following industry standard cross-reference matches matching the 2.9A - 4.0A threshold criteria:\n  \u003c\/p\u003e\n  \u003cdiv style=\"overflow-x: auto; margin-bottom: 25px;\"\u003e\n    \u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #eeeeee; text-align: left;\"\u003e\n      \u003cthead\u003e\n        \u003ctr style=\"background-color: #16c8c8; color: #ffffff;\"\u003e\n          \u003cth style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eEquivalent Configurations\u003c\/th\u003e\n          \u003cth style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eInterchange Compatibility Status\u003c\/th\u003e\n          \u003cth style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eCritical Mechanical \u0026amp; Wiring Verifications\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr style=\"background-color: #fafafa;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eSchneider Electric LRD08 (2.5A - 4.0A)\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eFunctional and Range Equivalence\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eRequires independent din-rail mounting base adapter if used away from native contactor configurations.\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eFuji Electric TR-0N\/3 (2.8A - 4.2A)\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eFunctional Alternative Target\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eConfirm auxiliary contact terminal location layout adjustments before reconnecting control loom wiring.\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003c!-- 8. Structured Data JSON-LD (FAQPage \u0026 WebApplication) --\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"FAQPage\",\n      \"mainEntity\": [\n        {\n          \"@type\": \"Question\",\n          \"name\": \"What is the mechanical difference between selecting Manual (H) vs Automatic (A) reset mode?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"In Manual Reset mode (factory default, blue pin depressed), once a trip occurs, an technician must physically inspect the hardware and press the reset plunger after the bimetal strips have cooled. In Automatic Reset mode (pin turned counter-clockwise), the internal mechanical latch resets autonomously as the strip returns to its flat state. Warning: Do not use Automatic mode in automated restarting architectures if a sudden restart poses mechanical hazards to staff.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"The relay trips during high inertia start cycles even though the running current is below 4A. How do I solve this?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"TECO RHU-10\/4K1 conforms to Class 10A tripping specifications. If the machinery exhibits a long acceleration curve (e.g., heavy fan blades or high-viscosity mixers) exceeding 10 seconds under locked-rotor current levels, the bi-metal strip accumulates critical thermal deflection before dropping to steady-state operational speed. Consider utilizing a bypass starting circuit or moving to a Class 20\/30 heavy-duty overload protection layout.\"\n          }\n        },\n        {\n          \"@type\": \"Question\",\n          \"name\": \"How do I test the internal auxiliary contact integrity without generating an actual thermal overload fault?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Pull or slide the integrated test indicator pin sharply outward using an isolated alignment tool. This mechanical displacement mimics a thermal trip condition, causing the NC contacts (95-96) to split open and the NO contacts (97-98) to snap closed. The orange flag indicator should display in the visual status window. Pressing the blue reset button restores the original circuit paths.\"\n          }\n        }\n      ]\n    },\n    {\n      \"@type\": \"WebApplication\",\n      \"name\": \"Koeed Thermal Overload Setting \u0026 Trip Calculator\",\n      \"applicationCategory\": \"BusinessApplication\",\n      \"operatingSystem\": \"All\",\n      \"browserRequirements\": \"Requires JavaScript. HTML5 Compatible.\",\n      \"description\": \"An interactive technical utility designed for automation electrical technicians and panel engineers to verify optimal current dial calibration settings and simulate estimated trip timing profiles on TECO RHU-10 bimetallic thermal overload relays.\"\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"TECO","offers":[{"title":"Default Title","offer_id":44395808719033,"sku":"334440034561","price":61.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0268\/8476\/7929\/files\/s-l1600_4d3e4d62-1e31-4e06-bb91-9dad00252e12.jpg?v=1722732698","url":"https:\/\/koeed.com\/sr\/products\/new-teco-rhu-10-4k1-thermal-overload-relay-amp-range-2-9-4a","provider":"KOEED","version":"1.0","type":"link"}