Hold Down Release Mechanism (HDRM)
Sierra Space
Field-resettable non-pyrotechnic hold-down and release mechanism using a redundant shape memory alloy trigger for low-shock release.
Technical specifications
- Trigger Mechanism
- Redundant shape memory alloy (SMA)
- Reset Time
- <1 minute
- Type
- Non-pyrotechnic, field-resettable
About
Sierra Space’s Hold Down Release Mechanism (HDRM) is a fast-acting separation nut rated to accommodate several working preloads. The HDRM series uses a conventional segmented separation nut with a redundant shape memory alloy (SMA) trigger that responds to a standard pyrotechnic firing pulse, enabling fast response times with low release shock.
Integral circuit interrupts open trigger circuits upon release, simplifying ground operations and flight control requirements. The HDRM resets and is ready for bolt insertion in less than 1 minute using the supplied reset pin, allowing rapid re-set and re-test that saves significant time and cost.
Documentation
No public datasheet yet — request the datasheet / ICD from the supplier.
