The UAL-50 from Riedon Resistors is a Power Resistor with Resistance 0.01 to 250000 ohm, Tolerance ±0.01 to 10 %, Power Rating 20 to 50 W, Voltage Rating 3500 V, Temperature Operating Range -55 to 275 Degree C. Tags: Through Hole. More details for UAL-50 can be seen below.