{"product_id":"abb-tu838-3bse008572r1-s800-i-o-extended-module-termination-unit","title":"ABB TU838 3BSE008572R1 S800 I\/O Extended Module Termination Unit","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe ABB \u003cstrong\u003eTU838 (3BSE008572R1)\u003c\/strong\u003e is an S800 I\/O Extended Module Termination Unit designed for ABB distributed control systems. It provides the electrical and mechanical interface between field wiring and S800 I\/O modules within System 800xA architectures.\u003c\/p\u003e\n\u003cp\u003eThis MTU distributes process power, routes ModuleBus signals, and supports up to 16-channel I\/O configurations. It is widely used in process automation environments where stable signal termination and modular expansion are required.\u003c\/p\u003e\n\u003cp\u003eThe TU838 supports fused transducer power outputs, redundant L+ \/ L- supply paths, and mechanical coding to prevent incorrect module installation.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e16-channel S800 I\/O termination unit\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCompatible with ABB System 800xA and Advant OCS\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIntegrated fused transducer power distribution\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMechanical keying system prevents incorrect module insertion\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDIN rail mounting with integrated grounding latch\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eRedundant L+ \/ L- process power support\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAutomatic ModuleBus sequential addressing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDesigned for industrial process automation systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003cth class=\"last:pe-10\"\u003eParameter\u003c\/th\u003e\n\u003cth class=\"last:pe-10\"\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eABB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eTU838\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct ID\u003c\/td\u003e\n\u003ctd\u003e3BSE008572R1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Series\u003c\/td\u003e\n\u003ctd\u003eS800 I\/O (System 800xA \/ Advant OCS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eExtended Module Termination Unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChannels\u003c\/td\u003e\n\u003ctd\u003e16 I\/O channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Voltage\u003c\/td\u003e\n\u003ctd\u003e50 V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Current\u003c\/td\u003e\n\u003ctd\u003e3 A per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Current\u003c\/td\u003e\n\u003ctd\u003e10 A max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProcess Power\u003c\/td\u003e\n\u003ctd\u003eL+ \/ L- redundant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuse Type\u003c\/td\u003e\n\u003ctd\u003e100 mA fast-blow (up to 3.5 A field replaceable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModuleBus Rating\u003c\/td\u003e\n\u003ctd\u003e1.5 A @ 5 V \/ 24 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003e35 mm DIN rail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection\u003c\/td\u003e\n\u003ctd\u003eIP20 (IEC 60529)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e58.5 × 64 × 170 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.375 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eSweden\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHS Code\u003c\/td\u003e\n\u003ctd\u003e85369095\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSystem Function and Architecture\u003c\/h3\u003e\n\u003cp\u003eThe TU838 operates as a passive termination and distribution module within S800 I\/O systems. It does not process signals but provides structured routing between field devices and I\/O modules.\u003c\/p\u003e\n\u003cp\u003eModuleBus communication uses sequential slot detection, allowing automatic addressing without software configuration. Each MTU passes position signals to the next unit in the DIN rail chain.\u003c\/p\u003e\n\u003cp\u003eThe unit also distributes process power through fused output groups, protecting connected field instruments from overload conditions.\u003c\/p\u003e\n\u003ch3\u003eInstallation and Wiring Guidelines\u003c\/h3\u003e\n\u003cp\u003eProper installation is required for stable system performance.\u003c\/p\u003e\n\u003cp\u003eMount the unit on a 35 mm DIN rail in a horizontal position. Ensure the DIN rail is properly grounded using low-impedance bonding to the cabinet earth system.\u003c\/p\u003e\n\u003cp\u003eMaintain a wire stripping length of 7 mm and tighten terminal screws to 0.5–0.6 Nm. Use proper separation between signal wiring and AC power lines to reduce electromagnetic interference.\u003c\/p\u003e\n\u003cp\u003eField wiring is divided into 16 signal channels with grouped fused transducer outputs. Some configurations allow shared fuse groups depending on module design.\u003c\/p\u003e\n\u003ch3\u003eMechanical Keying System\u003c\/h3\u003e\n\u003cp\u003eThe TU838 includes a dual mechanical keying system with six selectable positions per key, enabling 36 configuration combinations.\u003c\/p\u003e\n\u003cp\u003eThis prevents incorrect insertion of S800 I\/O modules such as AI810, DI810, or DO814. The system ensures mechanical compatibility and protects internal circuits from incorrect field voltage exposure.\u003c\/p\u003e\n\u003ch3\u003eEMC and Grounding Requirements\u003c\/h3\u003e\n\u003cp\u003eStable operation requires proper grounding and EMC design.\u003c\/p\u003e\n\u003cp\u003eThe DIN rail acts as a functional earth connection through the integrated latching mechanism. The cabinet must be connected to a low-impedance grounding system using copper braid.\u003c\/p\u003e\n\u003cp\u003eSignal cables should be separated from power cables to minimize noise coupling. Avoid long parallel routing between high-voltage and low-voltage lines.\u003c\/p\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cp\u003eThe ABB TU838 is used in:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eIndustrial process automation systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eOil and gas control systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePower generation plants\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eABB System 800xA DCS architectures\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eLarge-scale factory automation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSafety-critical instrumentation networks\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eOrdering Information\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eProduct ID: 3BSE008572R1\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eABB Type: TU838\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSystem: S800 I\/O\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMinimum Order Quantity: 1 piece\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the function of TU838 in S800 I\/O systems?\u003c\/strong\u003e\u003cbr\u003eIt provides signal termination, power distribution, and ModuleBus routing between field wiring and I\/O modules.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes TU838 require software configuration?\u003c\/strong\u003e\u003cbr\u003eNo. Module addressing is handled automatically through sequential ModuleBus signaling.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the fuses be replaced?\u003c\/strong\u003e\u003cbr\u003eYes. Fuses are field replaceable and can be upgraded depending on application requirements.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat happens if grounding is incorrect?\u003c\/strong\u003e\u003cbr\u003eImproper grounding may lead to EMC interference, unstable signals, or system communication errors.\u003c\/p\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":52668497920363,"sku":"TU838 3BSE008572R1","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/abb-tu838-3bse008572r1-tu838-extended-module-termination-unit-releuqkxedv_4820a9c5-09fa-4dcf-94fb-295b49e567ab.jpg?v=1765532469","url":"https:\/\/www.plcprotech.com\/products\/abb-tu838-3bse008572r1-s800-i-o-extended-module-termination-unit","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}