{"product_id":"new-cu-23-cu23-220vac-1pcs-teco-ac-contactor","title":"TECO AC Contactor CU-23 220VAC","description":"\u003c!-- SEO Introduction --\u003e\n\u003cdiv class=\"koeed-container\" style=\"line-height: 1.6; color: #333; font-family: sans-serif; width: 100%;\"\u003e\n    \u003ch2 style=\"color: #0056b3; border-left: 5px solid #16c8c8; padding-left: 15px; margin-top: 0;\"\u003eTECO CU-23 AC Contactor (220VAC Coil)\u003c\/h2\u003e\n    \u003cp\u003e\n        The \u003cstrong\u003eTECO CU-23\u003c\/strong\u003e is a highly reliable, heavy-duty AC contactor engineered for demanding industrial motor control applications. Operating with a standard \u003cstrong\u003e220V AC coil\u003c\/strong\u003e, it is designed to frequently switch electrical power circuits, making it a critical component in motor starters, automation panels, and HVAC systems.\n    \u003c\/p\u003e\n    \u003cp\u003e\n        Built in compliance with international IEC standards, the CU series ensures optimal arc quenching and minimal contact bounce. The \"23\" class rating makes it exceptionally suited for controlling 3-phase squirrel-cage motors (AC-3 utilization category) up to \u003cstrong\u003e11 kW (15 HP) at 380V-415V\u003c\/strong\u003e, providing a robust solution for factory automation infrastructure.\n    \u003c\/p\u003e\n\n    \u003c!-- Technical Specifications --\u003e\n    \u003ch3 style=\"color: #0056b3;\"\u003eDetailed Technical Specifications\u003c\/h3\u003e\n    \u003cdiv style=\"overflow-x: auto;\"\u003e\n        \u003ctable style=\"width: 100%; border-collapse: collapse; margin: 20px 0; border: 1px solid #eeeeee;\"\u003e\n            \u003cthead\u003e\n                \u003ctr style=\"background-color: #16c8c8; color: white;\"\u003e\n                    \u003cth style=\"padding: 12px; text-align: left; border: 1px solid #eeeeee;\"\u003eParameter\u003c\/th\u003e\n                    \u003cth style=\"padding: 12px; text-align: left; border: 1px solid #eeeeee;\"\u003eSpecification Data\u003c\/th\u003e\n                \u003c\/tr\u003e\n            \u003c\/thead\u003e\n            \u003ctbody\u003e\n                \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n                    \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eBrand \u0026amp; Series\u003c\/td\u003e\n                    \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eTECO (Taiwan Electric Equipment \u0026amp; Machinery) \/ CU Series\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr style=\"background-color: #fafafa;\"\u003e\n                    \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eModel Number\u003c\/td\u003e\n                    \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eCU-23\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n                    \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eCoil Control Voltage\u003c\/td\u003e\n                    \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e220V AC (50\/60 Hz)\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr style=\"background-color: #fafafa;\"\u003e\n                    \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eMain Power Poles\u003c\/td\u003e\n                    \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e3 Poles (3 NO)\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n                    \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eRated Operational Current (AC-3, 380V\/415V)\u003c\/td\u003e\n                    \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eApprox. 23A - 24A (Motor Load)\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr style=\"background-color: #fafafa;\"\u003e\n                    \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eMax Motor Power (AC-3, 380V\/415V)\u003c\/td\u003e\n                    \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e11 kW \/ 15 HP\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n                    \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eConventional Thermal Current (Ith, AC-1)\u003c\/td\u003e\n                    \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eApprox. 32A (Resistive Load)\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr style=\"background-color: #fafafa;\"\u003e\n                    \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eMounting Configuration\u003c\/td\u003e\n                    \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eStandard 35mm DIN Rail or Base Screw Mounting\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr style=\"background-color: #f4fcfc;\"\u003e\n                    \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee; font-weight: bold;\"\u003eInternational Standards\u003c\/td\u003e\n                    \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eIEC 60947-4-1, EN 60947-4-1\u003c\/td\u003e\n                \u003c\/tr\u003e\n            \u003c\/tbody\u003e\n        \u003c\/table\u003e\n    \u003c\/div\u003e\n\n    \u003c!-- Application \u0026 Reliability --\u003e\n    \u003ch3 style=\"color: #0056b3;\"\u003eIndustrial Application \u0026amp; Reliability\u003c\/h3\u003e\n    \u003cp\u003e\n        The AC-3 utilization category implies this contactor is built to withstand the massive inrush currents generated when starting a squirrel-cage induction motor (typically 5 to 7 times the full load running current), and safely breaking the current while the motor is running.\n    \u003c\/p\u003e\n    \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eMotor Control Centers (MCC):\u003c\/strong\u003e Frequently used in combination with thermal overload relays to form direct-on-line (DOL) motor starters for conveyors, pumps, and fans.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eHVAC Systems:\u003c\/strong\u003e Engaging and disengaging commercial air conditioning compressors and heavy-duty ventilation blowers.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eElectrical Isolation:\u003c\/strong\u003e Capable of providing safe electrical segregation in automation cabinets due to its robust silver-alloy contact design, minimizing contact welding risks under heavy loads.\u003c\/li\u003e\n    \u003c\/ul\u003e\n\n    \u003c!-- Koeed B2B Tool: 3-Phase FLA \u0026 Contactor Sizing Calculator --\u003e\n    \u003cdiv id=\"koeed-contactor-tool\" style=\"background: #f9f9f9; border: 2px solid #16c8c8; border-radius: 8px; padding: 20px; margin: 30px 0;\"\u003e\n        \u003ch3 style=\"margin-top: 0; color: #16c8c8;\"\u003eFAE Tool: 3-Phase Motor FLA \u0026amp; Contactor Sizing Calculator\u003c\/h3\u003e\n        \u003cp style=\"font-size: 0.9em; color: #666;\"\u003eNot sure if the 23A rating is sufficient for your motor? Use this calculator to determine the Full Load Amperage (FLA) of your 3-phase motor and get the recommended AC-3 contactor rating based on standard continuous load safety margins (125%).\u003c\/p\u003e\n        \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 Power Rating:\u003c\/label\u003e\n                \u003cdiv style=\"display: flex; gap: 5px;\"\u003e\n                    \u003cinput type=\"number\" id=\"koeed-power-input\" value=\"11\" step=\"0.1\" min=\"0.1\" style=\"width: 70%; padding: 8px; border: 1px solid #ccc; border-radius: 4px; box-sizing: border-box;\"\u003e\n                    \u003cselect id=\"koeed-unit-input\" style=\"width: 30%; padding: 8px; border: 1px solid #ccc; border-radius: 4px; box-sizing: border-box;\"\u003e\n                        \u003coption value=\"kw\"\u003ekW\u003c\/option\u003e\n                        \u003coption value=\"hp\"\u003eHP\u003c\/option\u003e\n                    \u003c\/select\u003e\n                \u003c\/div\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;\"\u003eLine Voltage (V AC):\u003c\/label\u003e\n                \u003cselect id=\"koeed-voltage-input\" style=\"width: 100%; padding: 8px; border: 1px solid #ccc; border-radius: 4px; box-sizing: border-box;\"\u003e\n                    \u003coption value=\"220\"\u003e220V - 240V\u003c\/option\u003e\n                    \u003coption value=\"380\" selected\u003e380V - 415V\u003c\/option\u003e\n                    \u003coption value=\"480\"\u003e480V\u003c\/option\u003e\n                \u003c\/select\u003e\n            \u003c\/div\u003e\n        \u003c\/div\u003e\n\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;\"\u003ePower Factor (cos φ):\u003c\/label\u003e\n                \u003cinput type=\"number\" id=\"koeed-pf-input\" value=\"0.85\" step=\"0.01\" min=\"0.5\" max=\"1\" style=\"width: 100%; padding: 8px; border: 1px solid #ccc; border-radius: 4px; box-sizing: border-box;\"\u003e\n                \u003csmall style=\"color: #888;\"\u003e*Typically 0.80 - 0.90 for induction motors.\u003c\/small\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;\"\u003eMotor Efficiency (%):\u003c\/label\u003e\n                \u003cinput type=\"number\" id=\"koeed-eff-input\" value=\"90\" min=\"50\" max=\"99\" style=\"width: 100%; padding: 8px; border: 1px solid #ccc; border-radius: 4px; box-sizing: border-box;\"\u003e\n            \u003c\/div\u003e\n        \u003c\/div\u003e\n        \n        \u003cbutton onclick=\"koeedCalculateSizing()\" style=\"background: #16c8c8; color: white; border: none; padding: 12px 24px; border-radius: 4px; cursor: pointer; font-weight: bold; transition: background 0.3s;\"\u003eCalculate Minimum Rating\u003c\/button\u003e\n        \n        \u003cdiv id=\"koeed-calc-results\" style=\"margin-top: 20px; padding: 15px; background: white; border-radius: 4px; border-left: 5px solid #0056b3; display: none; box-shadow: 0 2px 4px rgba(0,0,0,0.05);\"\u003e\n            \u003cdiv style=\"margin-bottom: 10px;\"\u003e\n\u003cstrong\u003eCalculated Full Load Amps (FLA):\u003c\/strong\u003e \u003cspan id=\"koeed-fla-out\" style=\"color: #333; font-weight: bold; font-size: 1.1em;\"\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n            \u003cdiv style=\"margin-bottom: 10px;\"\u003e\n\u003cstrong\u003eRecommended Contactor Rating (AC-3):\u003c\/strong\u003e \u003cspan id=\"koeed-rating-out\" style=\"color: #0056b3; font-weight: bold; font-size: 1.2em;\"\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n            \u003cp id=\"koeed-diag-msg\" style=\"font-size: 0.85em; color: #d32f2f; margin-top: 10px; font-weight: bold;\"\u003e\u003c\/p\u003e\n            \u003cp style=\"font-size: 0.85em; color: #555; margin-top: 10px; border-top: 1px solid #eee; padding-top: 10px;\"\u003e*Calculation Formula: I = P \/ (√3 × V × PF × Efficiency). The recommended sizing applies a standard 1.25 multiplier (125%) to the continuous FLA to account for prolonged running and minor voltage fluctuations.\u003c\/p\u003e\n        \u003c\/div\u003e\n\n        \u003cnoscript\u003e\n            \u003cp\u003e\u003cstrong\u003eSEO Tool Physics Formula:\u003c\/strong\u003e To manually calculate the 3-phase motor Full Load Amperage (FLA), use the formula: Amps = (Power in Watts) \/ (1.732 x Voltage x Power Factor x Efficiency). For continuous motor loads, NEC guidelines suggest sizing the AC-3 contactor at 125% of the calculated FLA to ensure longevity and prevent contact welding.\u003c\/p\u003e\n        \u003c\/noscript\u003e\n    \u003c\/div\u003e\n\n    \u003cscript\u003e\n        function koeedCalculateSizing() {\n            const powerVal = parseFloat(document.getElementById('koeed-power-input').value);\n            const unit = document.getElementById('koeed-unit-input').value;\n            const voltage = parseFloat(document.getElementById('koeed-voltage-input').value);\n            const pf = parseFloat(document.getElementById('koeed-pf-input').value);\n            const effPercent = parseFloat(document.getElementById('koeed-eff-input').value);\n            \n            const resultsBox = document.getElementById('koeed-calc-results');\n            const diagMsg = document.getElementById('koeed-diag-msg');\n\n            if (isNaN(powerVal) || isNaN(voltage) || isNaN(pf) || isNaN(effPercent) || powerVal \u003c= 0) {\n                alert(\"Please enter valid positive numbers for all motor parameters.\");\n                return;\n            }\n\n            \/\/ Convert to Watts\n            let powerWatts = 0;\n            if (unit === 'hp') {\n                powerWatts = powerVal * 745.7; \/\/ 1 HP = 745.7 Watts\n            } else {\n                powerWatts = powerVal * 1000; \/\/ kW to Watts\n            }\n\n            const efficiency = effPercent \/ 100;\n\n            \/\/ 3-Phase Current Formula: I = P \/ (sqrt(3) * V * PF * eff)\n            const root3 = Math.sqrt(3);\n            const fla = powerWatts \/ (root3 * voltage * pf * efficiency);\n            \n            \/\/ Recommended Sizing (125% of FLA)\n            const recommendedRating = fla * 1.25;\n\n            document.getElementById('koeed-fla-out').innerHTML = fla.toFixed(2) + \" Amps (A)\";\n            document.getElementById('koeed-rating-out').innerHTML = \"Minimum \" + recommendedRating.toFixed(2) + \" Amps (AC-3)\";\n            \n            if (recommendedRating \u003c= 24) {\n                diagMsg.innerHTML = \"✅ The TECO CU-23 (rated for ~23A\/24A AC-3) is highly suitable for this application.\";\n                diagMsg.style.color = \"#2e7d32\";\n            } else {\n                diagMsg.innerHTML = \"⚠️ The calculated continuous requirement exceeds 24A. Using the CU-23 may result in premature failure. Please consider upgrading to a higher capacity model (e.g., CU-32 or CN-35).\";\n                diagMsg.style.color = \"#d32f2f\";\n            }\n\n            resultsBox.style.display = 'block';\n        }\n    \u003c\/script\u003e\n\n    \u003c!-- Troubleshooting FAQ --\u003e\n    \u003ch3 style=\"color: #0056b3;\"\u003eTroubleshooting \u0026amp; Maintenance FAQ\u003c\/h3\u003e\n    \u003cp\u003e\u003cstrong\u003e1. The contactor emits a loud buzzing or humming noise when engaged.\u003c\/strong\u003e\u003cbr\u003e\n    A loud hum is not normal for a healthy AC contactor. This is almost always caused by one of two issues: First, check your control voltage. If the voltage supplied to the 220V coil drops significantly (e.g., below 180V) during startup, the magnetic pull is too weak to hold the armature tightly closed against the spring. Second, dust, rust, or debris may have accumulated on the faces of the magnetic iron core inside the contactor, preventing a flush seal. Blowing the core clean with compressed air usually resolves this.\u003c\/p\u003e\n    \n    \u003cp\u003e\u003cstrong\u003e2. The motor won't stop running even after the control power is turned off.\u003c\/strong\u003e\u003cbr\u003e\n    This is a dangerous condition known as \"contact welding.\" It occurs when an excessive overcurrent event (like a short circuit) or severe motor overload creates a massive arc that physically melts the silver alloy contacts together. If the contactor remains closed with no power applied to the A1\/A2 coil terminals, the contacts are welded. The CU-23 must be replaced immediately, and you must investigate the root cause of the overcurrent.\u003c\/p\u003e\n\n    \u003cp\u003e\u003cstrong\u003e3. Can I use a 220VAC coil contactor on a 24VDC control circuit?\u003c\/strong\u003e\u003cbr\u003e\n    No. Applying 24V DC to a 220V AC coil will not generate enough magnetic flux to actuate the contacts. Conversely, applying AC voltage to a DC coil will cause it to burn out instantly due to the lack of inductive reactance. The coil voltage must exactly match your control circuit panel voltage.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c!-- Structured Data --\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why is my TECO contactor humming loudly?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A loud humming noise from an AC contactor is typically caused by undervoltage to the coil (insufficient magnetic pull) or debris\/rust caught between the iron core mating surfaces inside the unit. Ensure the coil receives a steady 220VAC and clean the magnetic core.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why won't the contactor open when power is removed?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"If the contactor stays closed without power to the A1\/A2 coil terminals, the internal contacts have likely welded together due to a severe overcurrent event or short circuit. The contactor is permanently damaged and must be replaced.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use the CU-23 for a 24VDC control system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No, this specific CU-23 model features a 220VAC coil. You must use a contactor with a 24VDC designated coil for a 24VDC control system.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"WebApplication\",\n  \"name\": \"3-Phase Motor FLA \u0026 Contactor Sizing Calculator\",\n  \"description\": \"An engineering tool to calculate the Full Load Amperage (FLA) of 3-phase electric motors and determine the minimum recommended AC-3 contactor rating for industrial automation panels.\",\n  \"applicationCategory\": \"EngineeringTool\",\n  \"operatingSystem\": \"Any\"\n}\n\u003c\/script\u003e","brand":"TECO","offers":[{"title":"Default Title","offer_id":44413375578297,"sku":"253026706777","price":39.51,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0268\/8476\/7929\/files\/s-l1600_1ef078c1-2903-4811-8273-3a279fb99935.jpg?v=1723617143","url":"https:\/\/koeed.com\/bn\/products\/new-cu-23-cu23-220vac-1pcs-teco-ac-contactor","provider":"KOEED","version":"1.0","type":"link"}