Vishay Precision Group, Inc. today announced that its Vishay Foil Resistors product line (VFR) has introduced the new high-precision Bulk Metal® Foil Burden through-hole resistor. Designed for connection to the secondary-side of current sensing transformers, the device offers low TCR down to ±0.2 ppm/degree C from -55 to +125 degrees C (25 degrees C reference) and excellent load-life stability of ±0.005% after 2,000 hours at 0.1 W at 70 degrees C.
Current sensing transformers act as current sources and require a load. Like a voltage source, a current source shouldn't be left open, as it would cause an infinite voltage. The VFR Burden resistor converts the current to a limited voltage. Typically, the device will be used to discharge a capacitor when the circuit is no longer powered.
