The GWK 20 Ni from Vishay is a Power Resistor with Resistance 4.7 to 1800 ohm, Tolerance ± 5 to 10 %, Power Rating 13 W, Voltage Rating 400 V, Temperature Operating Range -55 to 350 Degree C. Tags: Screw Mount. More details for GWK 20 Ni can be seen below.