NK Technologies: Current Switch for Motor Monitoring

NK Technologies releases current sensing switch with adjustable setpoint for single- and three-phase motors.
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Sept. 5, 2012
2 min read
Motor Current Switch
ASXP current sensing switch. Source: NK Technologies.

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.

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David Greenfield, editor in chief

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David Greenfield joined Automation World in June 2011. Bringing a wealth of industry knowledge and media experience to his position, David’s contributions can be found in AW’s print and online editions and custom projects. Earlier in his career, David was Editorial Director of Design News at UBM Electronics, and prior to joining UBM, he was Editorial Director of Control Engineering at Reed Business Information, where he also worked on Manufacturing Business Technology as Publisher. 

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