{"product_id":"nce-5240205-bd20-block-detector-new","title":"NCE 5240205 BD20 Block Detector (Current Sensing, DCC, Up to 20A)","description":"\u003cp\u003eThe \u003cstrong\u003eNCE 5240205 BD20 Block Detector\u003c\/strong\u003e is the \u003cstrong\u003eBD20\u003c\/strong\u003e — a current-sensing block detector for DCC layouts, isolated from the track (no direct electrical connection) and rated up to 20 A track power.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat it does:\u003c\/strong\u003e Detects DCC track current being drawn through a single track feeder — locomotives + any rolling stock with current-drawing wheel-sets. Magnetically isolated from the track (no electrical connection), so it's safe across high-current power districts. \u003cstrong\u003eNeeds no external power for simple detection.\u003c\/strong\u003e Output can drive the NCE AIU01 or Mini Panel input, or with external 5–12 V DC can directly drive an LED or relay.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Current-sensing block detector (DCC)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIsolation:\u003c\/strong\u003e Magnetic — no direct electrical connection to track\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower required:\u003c\/strong\u003e None for detection; 5–12 V DC for LED \/ relay output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrack current rating:\u003c\/strong\u003e Up to 20 A DCC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrives:\u003c\/strong\u003e NCE AIU01, Mini Panel, external LED \/ relay\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNCE part:\u003c\/strong\u003e 5240205 (Walthers 524-205)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eTip:\u003c\/strong\u003e The BD20 is the standard NCE block detector — one per detection block. Connect the outputs to an AIU01 to feed block-occupancy data back to a JMRI computer via the USB Interface (5240223).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAbout NCE:\u003c\/strong\u003e NCE Corporation (USA) — a leading manufacturer of \u003cstrong\u003eNMRA-compliant DCC\u003c\/strong\u003e systems, mobile decoders, accessory decoders, and automation electronics. NCE products are renowned for the \u003cstrong\u003ePro Cab\u003c\/strong\u003e and \u003cstrong\u003ePower Cab\u003c\/strong\u003e throttles, the rugged \u003cstrong\u003eD-series\u003c\/strong\u003e mobile decoders (D13 \/ D408 \/ D16), the \u003cstrong\u003eSwitch-It \/ Switch8 \/ Snap-It\u003c\/strong\u003e family of accessory decoders for stationary turnout control, the \u003cstrong\u003eBD20\u003c\/strong\u003e block detector, and a full cab bus \/ booster \/ circuit-breaker ecosystem. Most NCE products are also fully compatible with other NMRA DCC systems.\u003c\/p\u003e\u003cp\u003eIn stock at Oakville Model Trains Depot.\u003c\/p\u003e","brand":"NCE","offers":[{"title":"Default Title","offer_id":45099719753910,"sku":"524-205","price":23.64,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/5131\/1286\/files\/57_4eb94257-8e21-4156-b5c5-626896af2244.jpg?v=1777689460","url":"https:\/\/oakvillemodeltrains.com\/products\/nce-5240205-bd20-block-detector-new","provider":"Oakville Model Trains Depot","version":"1.0","type":"link"}