Abstract: A protection device which includes an insulating tube closed at each end by a fuse cap. Electrically connected to one cap is a contact plug, and to the other cap a spring and a contact plunger. Sandwiched between the plug and the plunger is a combustible separator configured to disintegrate when the potential difference between the plug and the plunger exceeds a predetermined amount. This disintegration permits the spring to bias the plug and the plunger into electrical connection thus eliminating the potential difference. The protection member contains an accelerant to increase its rate of disintegration. The device is used to protect neon lighting systems from open circuits.