When Milliseconds Matter™

Safe Arm Device (SAD).

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Safe Arm Device

How Safe Arm Devices Work

The Safe Arm Device (SAD) is an electro-mechanical device used to provide a reliable initiation of an explosive train when it is commanded in the ARM state and provided with the correct firing stimulus. The SAD utilizes an Electro-Explosive Device (EED) for energetic output to initiate the explosive train. When the SAD is in the SAFE position the device is intrinsically safe from Safe Arm Device iiinadvertently initiating the connected explosive train. In the SAFE position, the detonator is both electrically and mechanically isolated (rotated out-of-line with the output port) from any electrical inputs and explosive train outputs providing the needed intrinsic safety. The SAD is commanded to the ARM state when the arming circuit is energized with the required input voltage pulse. In the ARM state, the EED is rotated to the SAD output port putting it in line with the explosive ordnance train. Once in the ARM state, the SAD can be initiated when the required electrical input stimulus is provided to the EED firing circuit. The SAD contains both local visual (window) and remote electrical redundant safe and arm position monitor circuits. The SAD includes a safing mechanism for manual safing.

The SAD is used in mission critical applications where a reliable initiation device that is intrinsically safe from inadvertent firing is needed. Typical applications needing these mission critical attributes include rocket or missile motor ignition, stage separation, and flight termination. Please see our electronic save and arm product page for additional technology options.

PacSci EMC SAD designs are qualified and extensively used on a multitude of launch vehicle and missile platforms, including Atlas, Delta, and Antares to name a few.

Minimum 3.5 AMP (5.0 AMP recommended) for 20 milliseconds

1 Amp/1 Watt for 5 minutes

Operating Temperature
-54 °F to +74 °F

Arming/Safing Voltage
22 to 35 VDC


Insulation Resistance
500 M at 500VDC

Electrostatic Discharge Immunity
25 KV / 500 pf / 5 K

Pre-function Leak Specification
5 x 10-5 standard cc/second of Helium

Applicable Specifications
Detonator qualified to MIL-STD-1576 and MIL-STD-454
Meets requirements of MIL-STD-464 (EMI)
Designs compliant to RCC-319


Geometric and electrical interface features are customizable to meet customer applications.

Safe Arm Device Technical



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