Devices detect over-current in power electronic circuits

Paul Boughton
E-T-A Circuit Breakers is launching a new range of over-current detectors. The TD and 9001 Hall effect current detectors protect power semiconductors in power electronic circuits by signalling when current in the circuit has exceeded the nominal detector trip point.  They are designed to be mounted directly on a printed circuit board and, like Hall effect current sensors, provide isolation between the sensed current and the output.
These new over-current detectors are available in a range of set detector trip points and are fully integrated with a digital output factory programmed to go low when the trip point is exceeded.  Both have a fast response time of 1us (typical), which allows ample time for the system control circuit to protect the power circuit. The TD and 9001 operate over a temperature range of -40 to +125 degrees C and, because the devices use the Hall effect, have negligible levels of power dissipation, even in high-frequency switching circuits.
The TD and 9001 over-current detectors are designed to protect power semiconductors in power electronic circuits. Typical applications include, but are not limited to: welding equipment, servo drives, treadmills, automotive power conversion, power supplies, MRI equipment and home audio.
For more information, visit