RCD Fusable Film Resistor,

100ohm, 1watt, 300v

Size:  9.5mm X 3.4mm (.375" X .135")

Low Cost Circuit Protection!

RCD pioneered fusible film resistors in the early 1970’s as a
low cost approach to circuit protection in case of overload or
component failure. The component is designed to act as a
conventional resistor under normal operating conditions, but
open quickly under fault conditions. Series BW meets the
requirements of EIA RS-325 and can be useful in eliminating
circuit board damage and fire hazards. Standard fusing
characteristics can be altered to customer requirements