Hot Bridgewire Electro-Explosive Devices (EED) are used to provide high reliable critical functions across many industries. An EED converts electrical energy into chemical energy providing a gas or heat output. An electrical input is applied to the EED, heating a small wire, called a bridgewire, which is in contact with the pyrotechnic. The wire quickly heats to the auto-ignition temperature of the pyrotechnic or explosive material. The pyrotechnic material then reacts providing gas pressure and/or flame. The heat and flame can be used to ignite other explosives or propellants while the gas pressure can be used to perform work.
Frequently used names are: initiator, igniter, ignitor, detonator, squib, cartridge, or pressure cartridge.
EEDs refer to a broad family of devices that are utilized to accomplish:
- time delay
A few applications include: aircraft seat ejection, aircraft fire extinguishing, oil well perforating, demolition, launch vehicles, satellites, missiles and munitions, parachute release and electrical circuit breakers.
PacSci EMC has designed, manufactured, and qualified hundreds of EEDs for use on multiple platforms for commercial and military aircraft, missiles and munitions, space and launch vehicles, and deep underground oil field applications. PacSci EMC is currently in production of an initiator line that was qualified in 1976 and has been in continuous production since.
3.5 amps at 0.999 reliability at 95% Confidence level
1.0 amps / 1.0 watt, 0.001 probability to fire at 95% lower confidence
Operating Temperature Ranges
As low as -420°F for PSEMC’s Space Initiator
AS high as +400°F for PSEMC’s GreenDetTM
Deflagration – Tailored peak output pressure performance
Detonation – Tailored dent depth in steel or Al dent block
Electrostatic Discharge, Typical
25 kVDC from a 500 pF capacitor with a 5000 ohm series resistor
MIL-DTL-23659 Initiators, Electric, General Design For; Appendix A: In-Line Initiator Certification
MIL-STD-1512: Electroexplosive Subsystems, Electrically Initiated, Design Requirements and Test Methods
DOD-E-83758: Explosive Ordnance for Space Vehicles, General Specification for
RCC-319: Range Commanders Council Flight Termination Systems Commonality Standard
MIL-STD-1576: Electroexplosive Subsystem Safety Requirements and Test Methods for Space Systems