{"product_id":"new-uht-brake-rectifier-block-ac-to-dc-drh555-555v-0-75a","title":"UHT Brake Rectifier Block DRH555 555V-0.75A","description":"\u003c!-- SEO Introduction --\u003e\n\u003csection class=\"koeed-container\"\u003e\n  \u003ch2 style=\"color: #0056b3;\"\u003eUHT DRH555 Industrial Brake Rectifier Block (555V AC \/ 0.75A DC)\u003c\/h2\u003e\n  \u003cp\u003e\n    The \u003cstrong\u003eUHT DRH555\u003c\/strong\u003e is a high-performance brake rectifier module specifically engineered for \n    electromagnetic brakes on industrial gear motors and hoisting systems. Operating at a high-voltage input \n    of \u003cstrong\u003e555V AC\u003c\/strong\u003e, it converts power to a stable \u003cstrong\u003e0.75A DC\u003c\/strong\u003e output to ensure \n    precise brake release and holding torque. Optimized for heavy-duty environments, the DRH555 minimizes \n    inductive kickback and heat dissipation, making it the ideal component for fail-safe braking in \n    automated warehouses and crane systems.\n  \u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eKeywords:\u003c\/strong\u003e UHT DRH555, Motor Brake Rectifier, 555V Rectifier Block, Electromagnetic Brake Control, Industrial Hoist Brake Module.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/section\u003e\n\n\u003chr style=\"border: 0; border-top: 1px solid #eeeeee; margin: 20px 0;\"\u003e\n\n\u003c!-- Technical Specifications --\u003e\n\u003csection class=\"koeed-specs\"\u003e\n  \u003ch3 style=\"color: #0056b3;\"\u003eTechnical Specifications\u003c\/h3\u003e\n  \u003cdiv style=\"overflow-x: auto;\"\u003e\n    \u003ctable style=\"width: 100%; border-collapse: collapse; text-align: left; font-size: 14px;\"\u003e\n      \u003cthead\u003e\n        \u003ctr style=\"background-color: #16c8c8; color: #ffffff;\"\u003e\n          \u003cth style=\"padding: 12px; border: 1px solid #eeeeee;\"\u003eParameter\u003c\/th\u003e\n          \u003cth style=\"padding: 12px; border: 1px solid #eeeeee;\"\u003eValue \/ Specification\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;\"\u003eModel Number\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eDRH555\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;\"\u003eManufacturer\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eUHT\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;\"\u003eInput Voltage (Max)\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e555V AC, 50\/60Hz\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;\"\u003eOutput Current (Max)\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003e0.75A DC\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;\"\u003eRectification Type\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eHalf-Wave (Einweggleichrichter)\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;\"\u003eHousing Material\u003c\/td\u003e\n          \u003ctd style=\"padding: 10px; border: 1px solid #eeeeee;\"\u003eHigh-Temp Flame Retardant Polymer\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003c!-- Application \u0026 Reliability --\u003e\n\u003csection class=\"koeed-application\" style=\"margin-top: 25px;\"\u003e\n  \u003ch3 style=\"color: #0056b3;\"\u003eIndustrial Reliability \u0026amp; Safety Insights\u003c\/h3\u003e\n  \u003cp\u003e\n    In precision motion control, the \u003cstrong\u003eDRH555\u003c\/strong\u003e acts as the critical interface between the motor's \n    AC supply and the DC brake coil. Its 555V rating is tailored for specialized industrial grids, particularly \n    in North American and heavy-industrial manufacturing sectors. The module is built to withstand the high \n    \u003cstrong\u003epeak reverse voltages\u003c\/strong\u003e generated by inductive coils during switching, protecting the \n    motor windings and external control PLC from electrical damage.\n  \u003c\/p\u003e\n\u003c\/section\u003e\n\n\u003c!-- Koeed B2B Tool: Brake Logic Assistant --\u003e\n\u003csection id=\"koeed-tool-section\" style=\"margin: 30px 0; padding: 25px; border: 2px solid #16c8c8; border-radius: 8px; background-color: #fff;\"\u003e\n  \u003ch3 style=\"text-align: center; color: #16c8c8; margin-top: 0;\"\u003eKoeed Interactive: Brake Logic \u0026amp; Voltage Assistant\u003c\/h3\u003e\n  \u003cp style=\"font-size: 13px; text-align: center; color: #666;\"\u003eEstimate DC output and select the correct switching mode for your application.\u003c\/p\u003e\n  \n  \u003cdiv style=\"display: flex; flex-direction: column; gap: 15px; max-width: 500px; margin: 0 auto;\"\u003e\n    \u003cdiv\u003e\n      \u003clabel for=\"koeed-ac-input\" style=\"display: block; margin-bottom: 5px; font-weight: bold;\"\u003eActual AC Input (V):\u003c\/label\u003e\n      \u003cinput type=\"number\" id=\"koeed-ac-input\" value=\"555\" style=\"width: 100%; padding: 12px; border: 1px solid #ccc; border-radius: 4px;\" aria-label=\"Enter AC Input Voltage\"\u003e\n    \u003c\/div\u003e\n    \n    \u003cdiv\u003e\n      \u003clabel for=\"koeed-mode\" style=\"display: block; margin-bottom: 5px; font-weight: bold;\"\u003eBraking Speed Requirement:\u003c\/label\u003e\n      \u003cselect id=\"koeed-mode\" style=\"width: 100%; padding: 12px; border: 1px solid #ccc; border-radius: 4px;\" aria-label=\"Select Braking Speed\"\u003e\n        \u003coption value=\"standard\"\u003eNormal Braking (AC-Side Switching)\u003c\/option\u003e\n        \u003coption value=\"fast\"\u003eFast Braking (DC-Side Switching)\u003c\/option\u003e\n      \u003c\/select\u003e\n    \u003c\/div\u003e\n\n    \u003cbutton onclick=\"koeedAnalyzeBrake()\" style=\"background-color: #16c8c8; color: white; border: none; padding: 14px; cursor: pointer; border-radius: 4px; font-weight: bold; font-size: 16px;\"\u003eRun Analysis\u003c\/button\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv id=\"koeed-tool-result\" style=\"margin-top: 20px; padding: 15px; background: #f9f9f9; border-left: 4px solid #16c8c8; display: none;\"\u003e\u003c\/div\u003e\n\n  \u003cnoscript\u003e\n    \u003cp\u003eManual Calculation: For the DRH555 Half-wave rectifier, DC Output = AC Input × 0.45. For 555V AC, expected DC output is 250V DC.\u003c\/p\u003e\n  \u003c\/noscript\u003e\n\u003c\/section\u003e\n\n\u003c!-- Troubleshooting FAQ --\u003e\n\u003csection class=\"koeed-faq\"\u003e\n  \u003ch3 style=\"color: #0056b3;\"\u003eField Engineering FAQ \u0026amp; Troubleshooting\u003c\/h3\u003e\n  \u003cdiv style=\"margin-bottom: 15px;\"\u003e\n    \u003cp\u003e\u003cstrong\u003eQ1: The brake is not releasing (opening) when power is applied.\u003c\/strong\u003e\u003cbr\u003e\n    \u003cem\u003eA:\u003c\/em\u003e Measure the DC output across terminals 3 and 4. If voltage is significantly lower than 0.45x the AC input, the internal diode may be damaged. Also, ensure the brake coil resistance is within manufacturer specs; a shorted coil will blow the rectifier's fuse or diode immediately.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"margin-bottom: 15px;\"\u003e\n    \u003cp\u003e\u003cstrong\u003eQ2: There is a significant delay in the brake engaging after power-off.\u003c\/strong\u003e\u003cbr\u003e\n    \u003cem\u003eA:\u003c\/em\u003e This is normal for AC-side switching. For \"Fast Braking\" in hoisting applications, you must use an auxiliary contact to break the DC circuit simultaneously. Refer to the \u003cstrong\u003eDC-Side Switching\u003c\/strong\u003e logic in our calculator above.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"margin-bottom: 15px;\"\u003e\n    \u003cp\u003e\u003cstrong\u003eQ3: The DRH555 module is overheating during operation.\u003c\/strong\u003e\u003cbr\u003e\n    \u003cem\u003eA:\u003c\/em\u003e Check the current draw. The DRH555 is rated for 0.75A DC. High-duty cycle applications (Class D\/E cranes) or using a coil with too low resistance will exceed this rating. Ensure the ambient temperature inside the motor terminal box is not exceeding 80°C.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003c!-- JavaScript Logic --\u003e\n\u003cscript\u003e\nfunction koeedAnalyzeBrake() {\n  const vac = parseFloat(document.getElementById('koeed-ac-input').value);\n  const mode = document.getElementById('koeed-mode').value;\n  const resultDiv = document.getElementById('koeed-tool-result');\n  \n  \/\/ Formula: Half-wave DC = AC * 0.45\n  const vdc = (vac * 0.45).toFixed(1);\n  \n  resultDiv.style.display = 'block';\n  let advice = \"\";\n  let logicImg = \"\";\n\n  if (mode === 'fast') {\n    advice = \"\u003cstrong\u003eRequired Logic:\u003c\/strong\u003e Use an additional auxiliary contact to interrupt the DC circuit between the rectifier and the coil. This collapses the magnetic field instantly.\";\n  } else {\n    advice = \"\u003cstrong\u003eRequired Logic:\u003c\/strong\u003e Switch the AC supply to the rectifier. This results in a slower engagement (0.1s - 0.5s) due to residual magnetism.\";\n  }\n\n  resultDiv.innerHTML = `\n    \u003cdiv style=\"font-weight: bold; color: #0056b3; margin-bottom: 8px;\"\u003eAnalysis Results:\u003c\/div\u003e\n    \u003cul style=\"margin: 0; padding-left: 20px; font-size: 14px; line-height: 1.6;\"\u003e\n      \u003cli\u003eExpected DC Output: \u003cstrong\u003e${vdc}V DC\u003c\/strong\u003e\u003c\/li\u003e\n      \u003cli\u003eBrake Coil Compatibility: \u003cstrong\u003eEnsure coil is rated for ~250V DC\u003c\/strong\u003e\u003c\/li\u003e\n      \u003cli\u003eSwitching Recommendation: ${advice}\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \u003cp style=\"font-size: 12px; color: #d9534f; margin-top: 10px;\"\u003e\u003cem\u003e*Critical: Never use a full-wave rectifier (0.9x AC) on a coil designed for half-wave (0.45x AC).\u003c\/em\u003e\u003c\/p\u003e\n  `;\n}\n\u003c\/script\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\": \"How to fix a UHT DRH555 brake rectifier that won't release?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure the DC output voltage. For the DRH555, it should be 45% of the AC input voltage. If absent, replace the rectifier and verify coil resistance to ensure no short circuits exist.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why is the braking response time slow on my gear motor?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Slow response is typically caused by AC-side switching. For immediate braking, implement DC-side switching by using an auxiliary contact to break the connection between the rectifier and the brake coil.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the max current capacity of the DRH555?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The UHT DRH555 is rated for a maximum continuous DC output current of 0.75 Amperes.\"\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\": \"Koeed Brake Logic \u0026 Voltage Assistant\",\n  \"operatingSystem\": \"All\",\n  \"applicationCategory\": \"IndustrialTool\",\n  \"description\": \"Calculates expected DC voltage and provides wiring logic recommendations for UHT industrial brake rectifiers.\"\n}\n\u003c\/script\u003e","brand":"KOEED","offers":[{"title":"Default Title","offer_id":44568874549433,"sku":"233952947701","price":81.11,"currency_code":"USD","in_stock":true}],"url":"https:\/\/koeed.com\/cs\/products\/new-uht-brake-rectifier-block-ac-to-dc-drh555-555v-0-75a","provider":"KOEED","version":"1.0","type":"link"}