Hall Effect Current Sensors HARTING Hall Effect Current Sensors provide current measurement in power electronic applications. These closed-loop sensors feature a current rating of 100A to 2kA, a DC to 100kHz frequency range, and 1µs or 3µs response time. HARTING Hall Effect Current Sensors measure different kinds of currents and are ideal for use in generators, electrical drives, switch-mode power supplies, and other power electronic applications.