NK Technologies re-designed its ASM Series Smart-Switch. These self-calibrating switches use the actual load current to set the trip point and help ensure that a motor is working properly. These current-sensing Smart-Switches are self-powered and self-calibrating to speed start-up and minimize installation costs. Three models are available to provide status monitoring, overload or underload, or operating window (overload and underload) functionality to suit particular pump, fan, heating element, conveyor or multi-load safety-interlocked application needs. The ASM sensor slides or snaps over one conductor feeding the load. The contact controls the input voltage, AC or DC, to 135 volts to a controller or small relay.