BS EN 16603-20-21:2020 pdf free.Space engineering — Interface requirements for electrical actuators. BS EN 16603-20-21 In general terms, the scope of the consolidation of the electrical interface requirements for electrical (hold down and release or deployment) actuators in the present ECSS-E-ST-20-21 and the relevant explanation in the handbook ECSS-E-HB-20-21 is to allow a more recurrent approach both for actuator electronics...