An IEC 62386-102 (Electronic Control Gear or ECG) is an output device, including but not limited to Lights, Relays and Emergency lights.
An IEC 62386-103 (Electronic Control Device or ECD) is an input device, including but not limited to sensors and switches.
Under each ECD are a number of subparts or components, these are instances. For example a zencontrol 4 way Sceneset contains four instances, one for each push button.
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