HDRM REACT – Hold Down & Release Mechanisms (5KN, 15KN, 35KN)

ARQUIMEA’s REACT Hold Down & Release Mechanisms are devices that firmly secure a payload aboard a satellite during transportation and launch, then release it by electrical activation once the satellite reaches its intended orbit. The product family spans three retention force classes — 5KN, 15KN and 35KN — and two maximum actuation temperature ranges (up to +65°C and up to +125°C), covering the full range of small to large satellite missions.

Each REACT device employs a two-stage mechanism consisting of a Structural Assembly responsible for withstanding high external loads, and a trigger based on Shape Memory Alloy (SMA) technology that converts electrical energy into heat and drives the mechanism into a bistable self-releasing state. Two independent motorization options are available: TiNi SMA or the proprietary SMARQ® high-temperature SMA. A redundant trigger ensures reliable release, and the in-field manual reset capability allows the end user to re-test the mechanism without dismounting or refurbishment in seconds.

Typical deployment applications include solar arrays, antenna booms, reflectors, instrument cover doors, shutter mechanisms, large structures, launch locks for gimbals and thrusters, stage separation, and caging mechanisms. The REACT family delivers low-shock release (below 1,300 g’s at maximum load), is fully ITAR/EAR free and uses 100% European technology, space-qualified parts, and standard electrical interfaces.

ARQUIMEA offers a complete solar array deployment system combining the HDRM REACT with a cup-cone interface, hinge, and REACT Electronics Control Unit (RECU). The mechanisms have extensive flight heritage across ESA programs including JUICE, μHETsat, the commercial microsatellite ESAIL, and Horizon 2020 In-Orbit Demonstration missions.