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 REJ603 REJ603BBB10NN3XB numerical relay Overview The ABB REJ603 (REJ603BBB10NN3XB) is a compact, self-powered numerical relay engineered for dependable feeder and earth-fault protection in medium- and low-voltage distribution systems. As part of ABB’s proven protection relay po *Your Name: *Your Email: *Your Name: *Vdcode: Submit