VACUUMSCHMELZE presents new additions to its current sensor range at PCIM 2012



VAC current sensors are widely used in a range of applications such as variable frequency drives or solar inverters to monitor the AC output current and its poten-tial share of DC. Unlike conventional Hall-effect sensors, VACUUMSCHMELZE current sensors use a VAC-developed magnetic field probe of Cobalt based-amorphous alloy as a zero-field detector, which offers distinct benefits such as minimal offset current and negligible long-term drift. Since offset current is practi-cally temperature-independent, the current sensors deliver reliable and ultra-precise readings, generally with double the accuracy of Hall-effect sensors. Vac sensors operate over a broad temperature range providing accurate measure-ment results and a long life span even in extreme ambient conditions. They fea-ture fast response time and operate over a wide frequency range. Cost optimized design and manufacturing processes make possible using this high-quality solu-tion in high volume applications. VAC's new family of AC-DC-sensitive differential current sensors (DI sen-sors), form the basis of residual current monitoring units (RCMUs) in photovoltaic inverters compliant with the IEC 62109 (VDE 0126) or UL 1741 standards. With VAC DI sensors, the use of expensive DC-sensitive (type B) RCDs can be avoid-ed. The operating current, conductors and the external test current are routed through the sensor, which thus records the current difference, i.e. the residual current, in the required range from 30 to 300 mA. Output is a voltage proportional to the differential current. VAC DI sensors offer a range of advanced functions, including sensor core demagnetization which can be triggered by supply voltage or on demand, self-testing with fault signal to detect defects in the magnetic cir-cuit or low supply voltage, and self-testing with an internally generated test cur-rent. New products featured at the 2012 PCIM will include sensors for up to 50 A rated current with extended clearance and creepage distances for system voltage up to 600 Vrms and operating voltage up to 1020 Vrms (overvoltage category 3 and pollu-tion degree 2). The dimensions of our new range for 1,5-50 Arms were retained thanks to the intelligent design of the primary conductors. Our compact range of sensors is advancing the development of increasingly high voltages for a wide range of applications. VAC also presents a new Sample Kit containing a range of compact sensors to measure AC and DC currents from 2 A to 700 A continuous and +/-1200 A peak. The kit also contains sensors for a +5 volt power supply with voltage output and internal or external reference voltage as well as sensors for +/- 12 15 volt pow-er supply with current output.