Abstract: Novel structure within the squib provides an internal spark gap for discharge of radio-frequency as well as static electricity, and isolation of the spark gap from the pyrotechnic charge. The preferred structure is in the form of a cup mounted inside the squib case and containing the pyrotechnic material; the bottom of the cup is partly cut away to permit the igniting filament to contact the pyrotechnic material, while the remainder of the cup bottom is welded to a terminal lead. The top of the cup is flanged outward toward the inside of the case, forming an annular spark gap. This invention is particularly advantageous in a two-pin squib with an electrically floating case, but under certain circumstances is also beneficial in a single-pin or "coaxial" squib.