Relays 3 : Over-current: Protective relays used on power systems that detect excessive currents and send signals to protective devices, such as power circuit breakers
Young & Company Electric Power Products and Related Engineering Services, Glossary of Electrical Terms, http://www.youngco.com/young2.asp?ID=4&Type=3, CA., USA 2001. (Electr Sfty - Amer) {514}