Vishay has introduced 8kW mica-insulated resistors in millbank size.
Called GREM, the firm is promoting them as a lower cost option to stainless steel grid designs.
“8kW at 40°C is 23 % higher than standard 6,500W stainless steel grid resistors in the standard millbank size,” said Vishay. “At the same time, GREM devices are 30 % lighter than stainless steel grid resistors with the same power dissipation, and offer a favourable price point.”
This is comparing GREM to the standard range of Vishay GRE1 plate resistors – However, others on the same GRE1 data sheet are specified up to 7,800W.
GREM values from 0.067Ω to 24.273Ω are available with a tolerance of ±10%, temperature coefficients down ±130ppm/°C and currents from 18A to 345A.
Overall size is 159 x 347 x 673mm. Operation is up to 415 °C.
Applications are foreseen in load banks, dynamic braking, and motor control, as well as in alternative energy applications.