{"product_id":"allen-bradley-81001-408-54-r-resistor-board-10r-500w","title":"Allen-Bradley 81001-408-54-R Resistor Board 10R 500W","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e81001-408-54-R\u003c\/strong\u003e is a \u003cstrong\u003epower resistor board\u003c\/strong\u003e manufactured by \u003cstrong\u003eAllen-Bradley (Rockwell Automation)\u003c\/strong\u003e. Rated at \u003cstrong\u003e10 ohms and 500 watts\u003c\/strong\u003e, this board is designed for high-power snubber, braking, and load-dump applications in industrial drive systems. It dissipates energy from switching transients and regenerative braking events, protecting power semiconductors and DC bus capacitors from overvoltage stress.\u003c\/p\u003e\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eResistance:\u003c\/strong\u003e 10 Ohms\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePower Rating:\u003c\/strong\u003e 500 W\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTolerance:\u003c\/strong\u003e ±5%\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Power resistor board \/ snubber assembly\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -40°C to +85°C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.7 kg (1.5 lbs)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Drive snubber, braking resistor, load dump\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFeatures \u0026amp; Benefits\u003c\/h3\u003e\n\u003col\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Wattage Capacity:\u003c\/strong\u003e 500 W continuous rating handles severe switching transients and regenerative energy in medium-voltage drives.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow Resistance Value:\u003c\/strong\u003e 10 Ohm design provides effective current limiting and energy dissipation for DC bus protection.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBoard-Mounted Construction:\u003c\/strong\u003e Integrated PCB format allows direct mounting inside drive chassis without external enclosures.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Temperature Tolerance:\u003c\/strong\u003e Operates from -40°C to +85°C in standard industrial control cabinets.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e±5% Tolerance:\u003c\/strong\u003e Tight resistance tolerance ensures consistent snubber performance and predictable voltage clamping.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between 81001-408-53-R and 81001-408-54-R?\u003c\/strong\u003e\u003cbr\u003eA: The \u003cstrong\u003e81001-408-53-R\u003c\/strong\u003e is a \u003cstrong\u003e360 Ohm \/ 100 W\u003c\/strong\u003e snubber resistor. The \u003cstrong\u003e81001-408-54-R\u003c\/strong\u003e is a \u003cstrong\u003e10 Ohm \/ 500 W\u003c\/strong\u003e power resistor board for higher-energy applications such as braking and load dump.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can this board be used as a dynamic braking resistor?\u003c\/strong\u003e\u003cbr\u003eA: Yes, the 10 Ohm \/ 500 W rating is suitable for \u003cstrong\u003edynamic braking applications\u003c\/strong\u003e in VFD and servo drive systems. Verify duty cycle and peak energy against your drive manufacturer's braking resistor calculator.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does the board require external cooling?\u003c\/strong\u003e\u003cbr\u003eA\u0026gt; At 500 W continuous load, \u003cstrong\u003eforced-air cooling\u003c\/strong\u003e or mounting on a thermally conductive surface is recommended. In intermittent duty, free-air convection may suffice.\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eMount the board on a \u003cstrong\u003emetal panel or heat sink\u003c\/strong\u003e with thermal interface material for heat dissipation.\u003c\/li\u003e\n  \u003cli\u003eConnect the resistor terminals across the \u003cstrong\u003eDC bus or braking transistor output\u003c\/strong\u003e per the drive wiring diagram.\u003c\/li\u003e\n  \u003cli\u003eInstall a \u003cstrong\u003ethermal switch or RTD\u003c\/strong\u003e on the resistor board to trigger an alarm if temperature exceeds 85°C.\u003c\/li\u003e\n  \u003cli\u003eVerify resistance with an ohmmeter before energizing to confirm no open-circuit damage occurred during shipping.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSelection Tips\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEnergy Calculation:\u003c\/strong\u003e Calculate peak braking energy (joules) and duty cycle to ensure the 500 W rating is not exceeded during repetitive stop\/start cycles.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOhmic Value:\u003c\/strong\u003e 10 Ohms is a common value for 460 VAC-class drives. For lower voltage drives, consult the drive manual for recommended braking resistance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThermal Management:\u003c\/strong\u003e In fully enclosed cabinets, add a cooling fan or specify a higher-wattage resistor to maintain safe operating temperatures.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":53993615556792,"sku":"81001-408-54-R","price":182.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/81001-450-52-R_84cde7b2-6611-4d1d-8983-824d3b9836e9.jpg?v=1787814546","url":"https:\/\/www.globalpetroparts.com\/products\/allen-bradley-81001-408-54-r-resistor-board-10r-500w","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}