The ECS series of 1-phase AC current sensors is a universal, overcurrent or undercurrent sensing control. Its built-in toroidal sensor eliminates the inconvenience of installing a stand alone current transformer. Includes onboard adjustments for current sensing mode, trip point and trip delay. Detects over or undercurrent events like locked rotor, loss of load, an open heater or lamp load or proves an operation is taking place or has ended.