Vermes
Advanced Member level 4
It is a relay which can be controlled using a button. This simple project can be applied to many different kinds of devices, if you want to start them without attaching bulky network switches on the housing. The designed boards and mounting schemes are shown below. The boards are for two most commonly used relays with or without supply system.
Pictures:
Link to original thread (useful attachment) – Przekaźnik sterowany przyciskiem