The W31-R01 JI is a cement coated Wire Wound Resistor with flameproof protection and tolerance at 1%. Power rating of 3W and temperature coefficient of ±1000ppm/°C. Solder coated copper. A high quality ceramic substrate is assembled with interference fit end caps to which are welded the element Note 1:5.8 for values 0R1 to the body, providing an effective seal which is impervious to moisture, shock, vibration, fungus and salt spray.