NEA® Model 9107 Hold Down & Release Mechanism (HDRM)
Ensign-Bickford Aerospace & Defense (EBAD)
The NEA® Model 9107 is an electrically initiated, one-shot hold down and release mechanism capable of carrying high tensile preload until commanded to release, offering extremely low release shock.
Key figurescomparable across the catalogue
- Mass
- 2.16 kg
Normalised to common units so this product can be compared with others in its category. The supplier's own wording is below.
As published by the supplier
- Proof Load Rating
- 58,500 lbf (260,000 N)
- Release Load Rating
- 46,000 lbf (195,000 N)
- Shock @ Preload
- <1,100 g's @ 46,000 lbf (195,000 N)
- Fuse Wire Resistance
- 1.2 to 2.0 Ω @ 25°C
- Actuation Current
- 4 Amps for 60 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
- 2.6° Cone
- Mass
- 2,155 g (4.75 lbm)
About
The NEA® Model 9107 is a Hold Down & Release Mechanism (HDRM) designed for applications requiring the secure holding and subsequent release of components with high tensile preloads. It operates as an electrically initiated, one-shot release mechanism. The preload is maintained by a release rod held by two separable spool halves, which are secured by a tightly wound restraining wire. This wire is held in place by redundant electrical fuse wires, ensuring maximum reliability as actuation of either circuit allows release. When sufficient electrical current is applied, the restraint wire unwinds, causing the spool halves to separate and release the rod and its associated preload. The mechanism is characterized by its non-explosive hold down and release function, high restrained preload capability, and extremely low release shock. It is suitable for a wide operating temperature range and can be operated with pyrotechnic initiation circuitry. The Model 9107 has a flight pedigree on more than 750 space platforms and over 20 years of flight heritage. Different configurations are available with alternate release rods, mounting features, and connectors, including metric options. 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.