TECO Single Phase Over Current Relays are ideal for sensing current faults in any one phase or earth for protection of Air Conditioners, Transformers & Generators etc. The resultant current measured is digitally compared to a settable reference. in case of trip condition trip contacts changeover after a settable time of 1 -10 sec. This can be used to trip the breaker. Time must be set according to system requirements. Two sets of changeover contacts are available. All contacts are 5A.