NEA® Model 9104 Hold Down & Release Mechanism (HDRM)
Ensign-Bickford Aerospace & Defense (EBAD)
The NEA® Model 9104 is an electrically initiated, one-shot non-pyrotechnic Hold Down & Release Mechanism (HDRM) capable of supporting release loads up to 15,000 lbf (67,000 N).
Technical specifications
- Proof Load Rating
- 18,750 lbf (84,000 N)
- Release Load Rating
- 15,000 lbf (67,000 N)
- Shock @ Preload
- <750 g's @ 15,000 lbf (67,000 N)
- Fuse Wire Resistance
- 1.2 to 2.0 Ω @ 25°C
- Actuation Current
- 4 Amps for 25 ms
- No-Fire Current
- 250 mA at 10-5 Torr @ 110°C
- Release Time
- <50 ms
- Operational Temperature Range
- -135°C to +135°C
- Maximum Angular Misalignment
- 3° Cone
About
The NEA® Model 9104 is a non-pyrotechnic Hold Down & Release Mechanism (HDRM) designed for one-shot, electrically initiated release. It can carry a very high tensile preload, applied through a release rod held by two separable spool halves. These halves are secured by a tight winding of restraining wire, which is held in place by redundant electrical fuse wires. Actuation of either circuit unwinds the restraint wire, allowing the spool halves to separate and release the rod and preload. This mechanism offers simple and reliable actuation, forming the basis for other EBAD products like Pin Pullers and Battery Cell Bypass Switches. It features non-explosive hold down & release, high restrained preload, extremely low release shock, high simultaneity for multiple hold-down points, and a wide operating temperature range. It can be operated with pyrotechnic initiation circuitry, uses space-rated materials, and has over 20 years of flight heritage on more than 750 space platforms. EBAD also offers factory refurbishments. Typical applications include antennas, reflectors, solar arrays, deployable radiators, booms, masts, scientific instruments, satellite and spacecraft dispensing, and launch vehicle/missile stage and fairing separation.
Documentation
No public datasheet yet — request the datasheet / ICD from the supplier.