If you have questions about our products, Fill out the form below and we will answer any questions you have. Tips: Fields marked with*are required. ABB RED670 1MRK002810-AC Line Differential Protector High-Speed Transmission Line Protection for Modern Power Grids The ABB RED670 1MRK002810-AC Line Differential Protection Relay is a premium Intelligent Electronic Device (IED) from ABB’s Relion® 670 series, engineered to deliver ultra-fa *Your Name: *Your Email: *Your Name: *Vdcode: Submit