Possible Actions: Long delay time – 1 1/2 to 80 hours delay after impact. Set to operate 2 to 72 hours after impact with ± 10% accuracy.

DESCRIPTION. The fuze is of type 3 construction and has a single electric firing circuit under plunger B. Depression of plunger B switches off the arming circuit. (See fig. 152.)

The clockwork time mechanism is contained in an aluminum case which threads into the bottom of the electric fuze. A spring loaded plunger projects into the balance wheel and prevents the clock from starting. The striker is held by a pawl, which is retained by the cam surface of the panel release arm. Rotation of the arm is prevented by an elbow piece which rests against the timing disc. The timing disc is rotated by the clockwork; one revolution equalling 72 hours. A tripping slot in the timing disc receives the elbow piece and allows rotation of the pawl release arm at the proper time.

The clock is set by turning the timing disc in a counterclockwise direction. To prevent firing during setting, a projection called the safety section is loacted under the timing disc. This safety sector bears against the elbow piece until the clock starts to operate.

On impact the electric fuze operates and fires a pyrotechnic pellet. This pellet burns out and frees the spring loaded clock release plunger from the balance wheel of the clock al-lowing the clock to start. The clock turns the timing disc in a counterclockwise direct by means of a redution gear system. When the tripping slot comes opposite the elbow piece, the spring loaded elbow piece drops into it. This causes the pawl release arm to rotate and free the tripping pawl from its cam. The pawl is forced aside by the spring-loaded striker which strikes the detonator. The flash from the detonator travels through a channel and fires the gaine.

REMARKS. This fuze may be used for demolition by charging the fuze from a battery. The storage cap may be replaced after the fuse is armed.

Figure 152 – (17) Electrical Clockwork Time Fuze