The GWK 40 Ni from Vishay is a Power Resistor with Resistance 6.8 to 2700 ohm, Tolerance ± 5 to 10 %, Power Rating 20 W, Voltage Rating 580 V, Temperature Operating Range -55 to 350 Degree C. Tags: Screw Mount. More details for GWK 40 Ni can be seen below.