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FUZE, MECHANICAL TIME AND SUPERQUICK: M520A1 and M520 |
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Filler and Weight | ||
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| NA, 0 | |||
| Body and Overall Weight | |||
| NA, 2.06 lb | |||
| Color | |||
| NA | |||
| Type of Round, DODIC | |||
| MTSQ, 1390-N280 |
| Description: |
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| The fuzes consist of a movement assembly, a point detonator assembly a lower cap, a body and a booster. The movement assembly contains a clockwork mechanism operated by centrifugal force acting on two gear segment weights. Springs assist in overcoming the inertia of the weights to assure functioning of the fuze at low projectile spin rates. The point detonator assembly housing the super-quick element consists of the nose of the fuze containing firing pin and support, and the head of the fuze containing an interrupter, a detonator, and booster lead charge. The brass lower cap contains provisions for releasing and setting the timing disk of the arming mechanism, and the cap is rotatable by a setting slot to provide for fuze time setting. The aluminum body houses a percussion primer and a relay. Graduations from S (for SAFE) to 0.5 through 75 seconds appear around the exterior. Fuzes are shipped with the SAFE mark aligned with the setting index on the lower cap, and with a pull wire attached to prevent inadvertent movement. Fuze M520A1 is assembled with Booster M125A which provides a delay arming distance of 200 feet. Fuze M520 uses Booster M125 which provides 150 feet. |
| Use: |
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| These dual purpose, mechanical time and superquick fuzes are used with ammunition calibers 90mm through 280mm, except 175mm. The fuze can be used to achieve either airburst or superquick impact detonation of the projectile, |
| Functioning: |
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| Turning the lower cap to set desired time in seconds prior to detonation simultaneously rotates the timing disk of the internal clockwork mechanism to correspond. Upon weapon firing, setback and centrifugal force release the mechanism until the timing disk has rotated to the preset time for detonation. Also upon weapon firing, centrifugal force withdraws the interrupter to arm the superquick detonation train, and actuates the delay arming of the booster. The purpose of the booster delay is to provide safe arming distance from the muzzle after weapon firing. When superquick impact action is desired, the fuze can be used as shipped, i.e. set in the S position, or may be set to a time greater than the projectile flight time. |
| Munition Components: |
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| Data Source: |
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| TM 43-0001-28 |
| Munitions Tech Data Sheet: |
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