Electromechanical Safe and Arm Device
When Milliseconds Matter™

Electromechanical Safe and Arm Device (SAD).

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PacSci EMC / Products / Electromechanical Safe and Arm Device (SAD)


Electromechanical Safe and Arm Device

How Safe Arm Devices Work

The Electromechanical Safe and Arm Device (ESAD) 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 ESAD 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 inadvertently 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 ESAD 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 ESAD output port putting it in line with the explosive ordnance train. Once in the ARM state, the Electromechanical Safe and Arm Device can be initiated when the required electrical input stimulus is provided to the EED firing circuit. The ESAD contains both local visual (window) and remote electrical redundant safe and arm position monitor circuits. This device also includes a safing mechanism for manual safing.

The Electromechanical Safe and Arm Device 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 ESAD 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.

Electromechanical Safe and Arm Device Technical



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