{"product_id":"pepperl-fuchs-z787-h-safe-zener-barrier-positive-polarity-series","title":"Pepperl+Fuchs Z787.H Safe Zener Barrier | Positive Polarity Series","description":"\u003ch3\u003eGlobal PLC Spare HUB Insight\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e\u003cspan style=\"color: #d32f2f;\"\u003eZ787.H\u003c\/span\u003e\u003c\/strong\u003e by \u003cstrong\u003e\u003cspan style=\"color: #d32f2f;\"\u003ePepperl+Fuchs\u003c\/span\u003e\u003c\/strong\u003e stands as a robust defense mechanism for hazardous zone instrumentation. As a high-power Zener barrier, it features a lower internal serial resistance than standard models, allowing for higher voltage delivery to field-side devices without sacrificing intrinsic safety. Its integrated \u003cstrong\u003ediode return\u003c\/strong\u003e mechanism is particularly clever; it effectively nullifies current flow into the hazardous area, simplifying complex safety calculations to a zero-current assumption. We recommend the \u003cstrong\u003e\u003cspan style=\"color: #d32f2f;\"\u003eZ787.H\u003c\/span\u003e\u003c\/strong\u003e for process-critical loops where maintaining high signal integrity over long distances is as vital as the safety certification itself.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Performance Profile\u003c\/h3\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e \u003cstrong\u003e\u003cspan style=\"color: #d32f2f;\"\u003ePepperl+Fuchs\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e \u003cstrong\u003e\u003cspan style=\"color: #d32f2f;\"\u003eZ787.H\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eModule Type:\u003c\/strong\u003e High-Power Zener Barrier (2-Channel)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePolarity:\u003c\/strong\u003e DC Version, Positive\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWorking Voltage:\u003c\/strong\u003e 26.5 V (at 10 µA)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSeries Resistance:\u003c\/strong\u003e Max. 250 Ω (Min. 235 Ω)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFuse Rating:\u003c\/strong\u003e 80 mA\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e 35 mm DIN Rail (EN 60715)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eProtection:\u003c\/strong\u003e IP20 (Modular terminal housing)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 12.5 mm x 115 mm x 116 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSafety \u0026amp; Diagnostic Capabilities\u003c\/h3\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eIntrinsic Safety Assurance:\u003c\/strong\u003e Acts as a fail-safe gate, preventing high-energy surges from entering explosive atmospheres.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDiode Return Logic:\u003c\/strong\u003e Incorporates specialized diodes to prevent reverse current, streamlining safety compliance documentation.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHigh-Power Efficiency:\u003c\/strong\u003e Optimized internal resistance minimizes voltage drops, making it ideal for devices that require stable operating voltage in the field.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAutomated Fault Response:\u003c\/strong\u003e In the event of a critical over-voltage fault, the internal circuitry conducts and safely triggers the 80 mA fuse, isolating the loop instantly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTypical Applications \u0026amp; Suitability\u003c\/h3\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eProcess Automation:\u003c\/strong\u003e Perfect for reading signals from transmitters and sensors located in ATEX\/IECEx rated zones.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePetrochemical Plants:\u003c\/strong\u003e Used extensively for monitoring valve positions and pressure readings where high-power signals are necessary.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eExplosive Environments:\u003c\/strong\u003e Certified for Gas, Dust, and Mining ([Ex ia Ga] IIC, [Ex ia Da] IIIC, [Ex ia Ma] I).\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSystem Retrofits:\u003c\/strong\u003e Its slim, modular design makes it suitable for upgrading existing control cabinets with limited rail space.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eLogistics \u0026amp; Guarantee\u003c\/h3\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGlobal Shipping:\u003c\/strong\u003e Fast transit via FedEx, UPS, or DHL.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDispatch Speed:\u003c\/strong\u003e Standard processing in 24 to 48 hours.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePerformance Warranty:\u003c\/strong\u003e 12-month full coverage against manufacturing defects.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePackage Contents:\u003c\/strong\u003e 1x \u003cstrong\u003e\u003cspan style=\"color: #d32f2f;\"\u003eZ787.H\u003c\/span\u003e\u003c\/strong\u003e Zener Barrier and technical compliance documentation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eProfessional FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQuestion: How does the \"diode return\" feature simplify my safety loop calculations?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAnswer: It eliminates the need to account for current flowing back from the safe area into the hazardous area during safety calculations, setting that specific parameter to zero.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuestion: Can I use the Z787.H in a circuit that requires negative polarity?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAnswer: No, the \u003cstrong\u003e\u003cspan style=\"color: #d32f2f;\"\u003eZ787.H\u003c\/span\u003e\u003c\/strong\u003e is strictly a positive polarity barrier; you must select a model designed for negative polarity if your application requires it.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuestion: What is the benefit of the \"high power\" design?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAnswer: It offers a lower series resistance compared to standard barriers, which ensures more of your loop voltage actually reaches the field device, preventing signal attenuation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuestion: What should I check if the fuse blows on one channel?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAnswer: A blown fuse indicates that the breakdown voltage of the internal Zener diodes was exceeded, typically caused by a short circuit or high-voltage fault in the safe-area wiring.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQuestion: Is it possible to mount these barriers directly onto existing DIN rails?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAnswer: Yes, the \u003cstrong\u003e\u003cspan style=\"color: #d32f2f;\"\u003eZ787.H\u003c\/span\u003e\u003c\/strong\u003e is designed for snap-on mounting to standard 35 mm DIN rails, ensuring quick integration into existing industrial cabinets.\u003c\/p\u003e\n\n\u003ch3\u003eProcurement Advisory\u003c\/h3\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePolarity Check:\u003c\/strong\u003e Always confirm that the anode of your Zener diode loop is indeed grounded, as this barrier is specifically engineered for positive polarity systems.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSpace Planning:\u003c\/strong\u003e With a slim 12.5 mm width, you can significantly increase channel density in your panels compared to wider barrier types.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSafety Compliance:\u003c\/strong\u003e Always refer to your specific loop certificate and Control Drawing (e.g., 116-0118 for FM) before finalizing your wiring design.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Pepperl+Fuchs","offers":[{"title":"Default Title","offer_id":45146315194550,"sku":"Z787.H","price":68.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0722\/7863\/8774\/files\/Z787.jpg?v=1779952711","url":"https:\/\/www.plcsparehub.com\/products\/pepperl-fuchs-z787-h-safe-zener-barrier-positive-polarity-series","provider":"Global PLC Spare Hub","version":"1.0","type":"link"}