LEM Offers Triple Current Measurement In Single Housing
LEM introduced its HTT series of PCB-mounting current transducers to provide the facility to measure three currents with a single PCB-mounted unit. The new transducers, with maximum measurement currents ranging from 25 to 150 ARMS, allow three-phase currents to be monitored independently by a unit occupying a mounting area of only 16.8 cm2 and with a height of only 29mm.
The HTT transducers have three 12 x 10mm apertures for the primary conductors and are securely mounted by four metallic pins, which are soldered to the PCB. Secondary connections for power supply, 0V and the three voltage outputs are also made to the PCB by pins.
Five different models using the same housing are available to cover nominal current measurements of 3 x 25, 50, 75, 100 or 150 ARMS, working with a bipolar power supply of ± 12 to ± 15 V. The use of open-loop Hall-effect technology allows dc, ac or pulse currents to be measured and provides galvanic isolation between the primary and output circuits, withstanding a test isolation voltage of 2.5 kVRMS/50Hz/1 min.
The transducers conform to the EN 50178 standard and are CE marked according to European Directive 2004/108/EEC. They are particularly suitable for industrial applications and home appliances, such as variable speed drives, UPS, SMPS and air-conditioners.
