Relay Protection Manufacturers and Product Models

Leading protective relay manufacturers include ABB, Siemens, Schneider Electric, SEL, and GE Grid Solutions, offering a wide range of models for overcurrent, differential, arc-flash, and feeder protection.Top Protective Relay ManufacturersABB – A global leader in power system protection, ABB offers digital and electromechanical relays for overcurrent, differential, and distance protection. Popular models include the REJ600, RET670, and REX640, widely used in transmission and distribution networks . Siemens – Known for the SIPROTEC series, Siemens provides relays for protection, control, and automation. Key models include SIPROTEC 5, SIPROTEC 4, and the 3RU thermal overload relay for motor protection . Schneider Electric – Offers the Easergy and TeSys ranges, integrating protection, control, and automation. These relays are suitable for industrial plants and power distribution systems . Schweitzer Engineering Laboratories (SEL) – SEL specializes in advanced digital relays with AI-enabled protection and predictive diagnostics. Popular models include SEL-351, SEL-751, and SEL-700 series, designed for utility-scale and industrial applications . GE Grid Solutions – Provides relays for transmission, distribution, and industrial applications, including the Multilin 869, Multilin 750, and Multilin 850 series, supporting IEC 61850 communication and advanced monitoring . Fanox – Offers specialized relays like the SIR-A for recloser control and feeder protection, and microprocessor-based arc-flash relays such as AF0100, AF0500, and AFR-M, designed for rapid detection and tripping in arc-flash scenarios .Other Notable ManufacturersFinder – Produces general-purpose, timer, monitoring, and power relays, with over 14,500 products for industrial automation .Crydom – Focused on solid-state relays (SSRs) for fast and frequent switching, including panel mount, DIN rail, and PCB mount SSRs .Zettler Group – Offers general-purpose, power, and latching relays for industrial and home appliance applications .Omron – Known for the G2R and MY series, providing reliable switching for industrial automation .Eaton – Offers thermal overload relays like Xstart ZB for motor protection and industrial automation .Key Relay Types and ApplicationsOvercurrent Relays – Protect circuits from excessive current.Differential Relays – Detect differences between incoming and outgoing currents to protect transformers and generators.Arc-Flash Relays – Detect arc faults and rapidly trip breakers to protect personnel and equipment.Feeder Protection Relays – Monitor voltage, current, and frequency to safeguard distribution feeders.Motor Protection Relays – Protect motors from overload, phase loss, and thermal stress. These manufacturers provide detailed datasheets, application notes, and technical support to help select the appropriate relay model for specific electrical systems, ensuring reliability, safety, and compliance with industry standards .