Login The New SEL-851 Feeder Protection Relay Feature-Rich Protection at a Competitive Price The SEL-851 provides protection, monitoring, and control for utility and industrial feeder applications in a compact device. VISIT PRODUCT PAGE Protect Feeders With Overcurrent Elements The SEL-851 offers a variety of phase, negative-sequence, residual, and neutral overcurrent elements. Prevent Equipment Damage With Voltage Protection The voltage input option provides voltage, frequency, directional power, loss-of-potential, and power factor elements. Increase Safety With Arc-Flash Detection The SEL-851 combines light-sensing technology and high-speed overcurrent protection to detect arc-flash events as quickly as within 1 ms, reducing equipment damage and increasing personnel safety. Streamline Integration Serial, USB-C, and Ethernet ports as well as DNP3, Modbus, and IEC 61850 protocols provide communications options for improved system integration. Simplify Inventory The relay’s universal power supply (24–250 Vdc, 110–240 Vac), setting-selectable universal current inputs (1 A/5 A), and software-selectable contact inputs (24–250 Vac/Vdc) allow for reduced inventory and maintenance expenses. Reduce Commissioning Time The easy-to-use SEL Grid Configurator software features a spreadsheet-style editor, powerful protection visualization, comprehensive reporting, custom filters, and multiple device settings management. Improve Messaging Speeds Deterministic timing and ease of programming along with the flexibility and multidevice communications of fixed GOOSE messaging guarantees outgoing messages are processed every 4 ms. Gain Greater System Visibility High-resolution currents and voltages (sampled at 10 kHz) help quickly identify problems such as harmonics produced by switching or damaged cables before they cause a significant interruption. LEARN MORE ABOUT THE SEL-851 Discover Customer Highlights Solutions Technologies Products Product Catalogs SEL Video Financing About About SEL Careers Company Store Support Customer Service Technical Support Education Product Feature Comparisons FAQ Warranty Terms and Conditions Certifications Corporate Headquarters 2350 NE Hopkins Court Pullman, WA 99163 - USA Phone: +1.509.332.1890 Fax: +1.509.332.7990 © 2021 - Schweitzer Engineering Laboratories, Inc. Privacy Policy Cookie Policy Sitemap By continuing to browse or by clicking “Accept All Cookies,” you agree to the storing of first- and third-party cookies on your device to enhance site navigation and analyze site usage for an improved user experience. View our Cookie Policy ACCEPT ALL COOKIES