In machinery design, component flexibility is a key factor in determining what parts are used. The wider range of applicability a device offers, the more options it gives to the OEM.
Designed for OEMs, the ASXP series of current sensing switches from NK Technologies can have their setpoints adjusted from 1 to 80 Amps. The switches can be used with 24V ac/dc or 120V ac supplies and reportedly offer low hysteresis and an operations range between 40 and 100 hertz, making them suitable for single- or three-phase motors.
Of particular note is NK Technologies’ inclusion of a fixed two-second delay trip timer designed to eliminate nuisance alarms caused by start-up inrush or temporary over-current conditions in motor or heater status applications. By building in this timer, it eliminates the need for OEMs to install a separate time delay relay. After startup, the timer allows for an additional 0- to 20-second delay to be set to meet the needs of specific application requirements.
The switches also come standard with a solid-core enclosure and LED indicators for trip point contact status.
These sensor switches also provide electronic proof-of-operation and detect current draw changes in motors caused by pumps running dry or impending bearing failure. NK Technologies says the ASXP series can serve as a non-intrusive alternative to differential pressure flow sensors or thermal switches, while delivering quicker response times than Class 10 overload relays.
