instantaneous fuse

However, if a grenade was to be used as a fixed booby-trap then an instantaneous fuse would be fitted.

The Canadian Corps paid particular attention to eliminating German barbed wire, a task made easier with the introduction of the No. 106 instantaneous fuse.

It was also possible to connect a pencil detonator to so-called "instantaneous fuse" (not to be confused with detonating cord) which had an unusually fast burn rate of over 10 metres per second.