The 81 3011B from Smiths Interconnect is a Resistor with Resistance 12 to 400 Ohms, Power Rating 100 W, Tolerance ±5%. Tags: Surface Mount, Chip, 12 to 400 Ohms, 5 to 250 Ohms, 250 W, Tab & Cover Thin Film RF Resistor. More details for 81 3011B can be seen below.