{"title":"CDU","description":null,"products":[{"product_id":"cdu2c-fc","title":"CDU2C-FC Fast Charge Capacitor Discharge Unit","description":"\u003cp\u003eThe \u003cstrong\u003eBLOCKsignalling CDU2C-FC\u003c\/strong\u003e is a fast charging capacitor discharge unit designed for reliable and safe operation of points motors on medium to large model railway layouts.\u003c\/p\u003e\n\u003cp\u003eIt stores electrical energy in internal capacitors and releases it as a short, high current pulse when a switch is operated, ensuring strong and consistent point switching while protecting both motors and control switches.\u003c\/p\u003e\n\u003cp\u003eThis provides a sharp, positive movement of the points without allowing sustained current through the switch contacts, helping to prevent overheating and electrical arcing.\u003c\/p\u003e\n\u003cp\u003eThe fast charging design allows the unit to recharge in a fraction of a second, making it ideal for layouts where multiple points may be operated in quick succession.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eProvides a high current pulse for reliable points motor operation.\u003c\/li\u003e\n\u003cli\u003eProtects points motors from burn-out by limiting sustained current.\u003c\/li\u003e\n\u003cli\u003ePrevents switch contact damage by eliminating electrical arcing.\u003c\/li\u003e\n\u003cli\u003eReduces voltage fluctuations across the rest of the layout.\u003c\/li\u003e\n\u003cli\u003eFast charging for rapid recovery between operations.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBuilt-in indicator LEDs.\u003c\/li\u003e\n\u003cli\u003eSuitable for operating multiple points, even over longer distances.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eElectrical Requirements\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAccepts 12V AC to 24V AC or 15V DC to 35V DC input.\u003c\/li\u003e\n\u003cli\u003eRecommended supply rating: 1A.\u003c\/li\u003e\n\u003cli\u003eCompatible with controller auxiliary outputs or suitable DC power supplies.\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eWiring Diagram\u003c\/h3\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0994\/4009\/9673\/files\/SS2A_Wiring_10ffa72d-e8fd-4643-8600-6a8496b93f88.png?v=1776955580\"\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eWiring Multiple Points\u003c\/h3\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0994\/4009\/9673\/files\/SS2A_Wiring_1_15bc9c58-da26-4bba-afeb-adddc922d3f3.png?v=1776955581\"\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSuitable for all common solenoid points motors (e.g. Hornby, Peco).\u003c\/li\u003e\n\u003cli\u003eDesigned for medium to large layouts where multiple points may be used.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eDocumentation \u0026amp; Support\u003c\/h3\u003e\n\u003cp\u003eFor detailed information on installation, wiring connections, and troubleshooting, please download the latest instruction manual:\u003c\/p\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" title=\"CDU2C\" href=\"https:\/\/drive.google.com\/file\/d\/1dTz6OcwaOWfFueNjfRYOGV_-InSIuGMN\/view?usp=sharing\" target=\"_blank\"\u003eProduct Instruction Manual\u003c\/a\u003e\u003c\/p\u003e","brand":"BLOCKsignalling","offers":[{"title":"Default Title","offer_id":56860613312857,"sku":null,"price":12.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0994\/4009\/9673\/files\/cdu2c-fc-fast-charge-capacitor-discharge-unit-1249063968.jpg?v=1784048957"},{"product_id":"cdu1e","title":"CDU1C Fast Charge Capacitor Discharge Unit","description":"\u003cp\u003eThe \u003cstrong\u003eBLOCKsignalling Capacitor Discharge Unit (CDU)\u003c\/strong\u003e stores electrical energy in a capacitor and releases it as a short, high-current pulse when a switch is operated. This burst of energy provides reliable operation of points while drawing far less continuous current than a transformer would otherwise need to supply.\u003c\/p\u003e\n\u003cp\u003eThe CDU also protects points motors from burn-out by limiting any sustained current caused by faults in the switching circuit, while helping to maintain stable voltage levels across the rest of the layout. This single-capacitor version is ideal for smaller layouts.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eProvides a high-current pulse to reliably operate points motors.\u003c\/li\u003e\n\u003cli\u003eHelps prevent points motor burn-out by limiting subsequent current flow.\u003c\/li\u003e\n\u003cli\u003eReduces voltage fluctuations across the rest of the layout.\u003c\/li\u003e\n\u003cli\u003eFast capacitor charging allows for quicker recovery between operations.\u003c\/li\u003e\n\u003cli\u003eBuilt-in LED indicators display the operating status of the unit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eElectrical \u0026amp; Application Information\u003c\/h3\u003e\n\u003cp\u003eThis unit is fitted with a single capacitor and is suitable for smaller-sized layouts.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eDocumentation \u0026amp; Support\u003c\/h3\u003e\n\u003cp\u003eFor detailed information on installation, wiring connections, and troubleshooting, please download the latest instruction manual:\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/drive.google.com\/file\/d\/19JLM7DxgzYtO1lvQDjuopTX5fa4eqbOk\/view?usp=sharing\" title=\"CDU1E\" rel=\"noopener\" target=\"_blank\"\u003eProduct Instruction Manual\u003c\/a\u003e\u003c\/p\u003e","brand":"BLOCKsignalling","offers":[{"title":"Default Title","offer_id":56860629762393,"sku":null,"price":9.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0994\/4009\/9673\/files\/cdu1c-fast-charge-capacitor-discharge-unit-1257659394.jpg?v=1788981852"},{"product_id":"cdu4f","title":"CDU4F Fast Charging Capacitor Discharge Unit","description":"\u003cp data-start=\"50\" data-end=\"378\"\u003eThe \u003cstrong\u003eCDU4F Fast Charging Capacitor Discharge Unit\u003c\/strong\u003e delivers a powerful, short-duration current pulse to ensure positive and reliable point motor operation. By storing energy in internal capacitors and releasing it in a controlled burst, it provides strong switching performance without placing excessive load on your power supply.\u003c\/p\u003e\n\u003cp data-start=\"380\" data-end=\"623\"\u003eAfter the initial surge, the CDU limits sustained current to protect point motors from burn-out caused by wiring faults or prolonged switch operation. It also prevents voltage drop across the rest of the layout while points are being operated.\u003c\/p\u003e\n\u003chr data-end=\"665\" data-start=\"662\"\u003e\n\u003ch3 data-end=\"694\" data-start=\"667\"\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDelivers a high current pulse for positive point motor operation\u003cbr data-start=\"845\" data-end=\"848\"\u003e\n\u003c\/li\u003e\n\u003cli\u003eProtects point motors from burn-out caused by wiring faults or prolonged switching\u003cbr data-start=\"932\" data-end=\"935\"\u003e\n\u003c\/li\u003e\n\u003cli\u003ePrevents voltage fluctuations across the layout during operation\u003cbr data-start=\"1001\" data-end=\"1004\"\u003e\n\u003c\/li\u003e\n\u003cli\u003eFast charging for rapid recovery between operations\u003cbr data-start=\"1057\" data-end=\"1060\"\u003e\n\u003c\/li\u003e\n\u003cli\u003eBuilt-in LED indicators for charge status monitoring\u003cbr data-start=\"1114\" data-end=\"1117\"\u003e\n\u003c\/li\u003e\n\u003cli\u003eReady light fitted as standard, with connection for remote panel LED\u003cbr data-start=\"1187\" data-end=\"1190\"\u003e\n\u003c\/li\u003e\n\u003cli\u003eAvailable in storage capacities suitable for layouts of all sizes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"988\" data-start=\"985\"\u003e\n\u003ch3 data-end=\"1015\" data-start=\"990\"\u003ePower Requirements\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUp to 35V DC or 24V AC input\u003cbr data-start=\"1033\" data-end=\"1036\"\u003e\n\u003c\/li\u003e\n\u003cli\u003eCommonly used with 16V AC controller auxiliary outputs\u003cbr data-start=\"1092\" data-end=\"1095\"\u003e\n\u003c\/li\u003e\n\u003cli\u003eMinimum recommended supply: 12V AC or 15V DC\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"988\" data-start=\"985\"\u003e\n\u003ch3 data-end=\"1299\" data-start=\"1273\"\u003eDocumentation \u0026amp; Support\u003c\/h3\u003e\n\u003cp data-end=\"1445\" data-start=\"1301\"\u003eFor detailed information on installation, wiring connections, and troubleshooting, please download the latest instruction manual:\u003c\/p\u003e\n\u003cp data-end=\"1445\" data-start=\"1301\"\u003e\u003ca title=\"CDU4F\" href=\"https:\/\/drive.google.com\/file\/d\/1bngowK7JPPuBlO4N79ggLMHQhTSQOv0F\/view?usp=sharing\" target=\"_blank\"\u003eProduct Instruction Manual\u003c\/a\u003e\u003c\/p\u003e","brand":"BLOCKsignalling","offers":[{"title":"Default Title","offer_id":56860636283225,"sku":null,"price":16.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0994\/4009\/9673\/files\/cdu4f-fast-charging-capacitor-discharge-unit-1249063962.jpg?v=1784048654"},{"product_id":"cdu4f-led","title":"CDU4F Fast Charging Capacitor Discharge Unit with Ready LED","description":"\u003cp\u003eThe \u003cstrong\u003eCDU4F Fast Charging Capacitor Discharge Unit\u003c\/strong\u003e delivers a powerful, short-duration current pulse to ensure positive and reliable point motor operation. By storing energy in internal capacitors and releasing it in a controlled burst, it provides strong switching performance without placing excessive load on your power supply.\u003c\/p\u003e\n\u003cp\u003eAfter the initial surge, the CDU limits sustained current to protect point motors from burn-out caused by wiring faults or prolonged switch operation. It also prevents voltage drop across the rest of the layout while points are being operated.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDelivers a high current pulse for positive point motor operation\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eProtects point motors from burn-out caused by wiring faults or prolonged switching\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePrevents voltage fluctuations across the layout during operation\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFast charging for rapid recovery between operations\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBuilt-in LED indicators for charge status monitoring\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eReady light fitted as standard, with additional control panel ready LED connection for remote indication.\u003c\/li\u003e\n\u003cli\u003eAvailable in storage capacities suitable for layouts of all sizes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003ePower Requirements\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUp to 35V DC or 24V AC input\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCommonly used with 16V AC controller auxiliary outputs\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMinimum recommended supply: 12V AC or 15V DC\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eDocumentation \u0026amp; Support\u003c\/h3\u003e\n\u003cp\u003eFor detailed information on installation, wiring connections, and troubleshooting, please download the latest instruction manual:\u003c\/p\u003e\n\u003cp\u003e\u003ca title=\"CDU4F\" href=\"https:\/\/drive.google.com\/file\/d\/1bngowK7JPPuBlO4N79ggLMHQhTSQOv0F\/view?usp=sharing\" target=\"_blank\"\u003eProduct Instruction Manual\u003c\/a\u003e\u003c\/p\u003e","brand":"BLOCKsignalling","offers":[{"title":"Default Title","offer_id":57905758962009,"sku":null,"price":16.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0994\/4009\/9673\/files\/cdu4f-fast-charging-capacitor-discharge-unit-with-ready-led-1251699526.jpg?v=1785498259"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0994\/4009\/9673\/collections\/cdu2c-fc-fast-charge-capacitor-discharge-unit-1249063968.jpg?v=1788981536","url":"https:\/\/blocksignalling.co.uk\/collections\/cdu.oembed","provider":"BLOCKsignalling","version":"1.0","type":"link"}