DESCRIPTION. This fuze is similar to the normal Rheinmetall electric fuze with the ex-ception of a third plunger in the head of the fuze. It is smaller than the two normal con-tact pins and is used for test purposes only. The A and B plungers are connected, when depressed, to the firing and reservoir condensers respectively. Safety switching is ac-complished by depressing both plungers. Each plunger disconnects one pole of the igniter bridge. (See fig. 169.)

The El.Zt.Z. (9) A is identical in essentials with fuze (9) except that the resistance is 22 megohms instead of 42 megohms. This reduces delay time 50 percent.

OPERATION. The A plunger (contact pin) conveys an initial charge to the firing conden-ser. The amount of this charge determines the time laps before firing and is controlled. The charging condenser is loaded as usual through the B plunger.

This fuze is designed to operate after a predetermined time. The glow discharge tube acts as a switch in this fuze. When the voltage on the firing condenser builds up to the required figure, the gas (Argon) within the glow discharge tube ionizes and allows the charge to pass through the tube. This fires the match composition and subsequently the powder delay train.

Figure 169 – (9) Electrical Aerial Burst Fuze