AboutDave Nyce Expertise I have been an electronics engineer for 25 years. I can answer questions on analog and digital circuits and my specialty is sensors.
Experience I am the inventor on 23 US patents, and also some foreign ones. Developed sensors for over 25 years. Licensed private pilot (airplane and rotorcraft), have HAM radio license. I'm not an expert in computer networking.
Question what is dry contact & wet contact,slow blow fuse?
Answer A dry contact is a set of two connections that can be open or closed (connected together). A wet contact is the same set of contacts, but one of the contacts is already connected to a voltage. So, if you connect a wet contact to one side of a light bulb of the correct voltage, for example, (with the other side of the bulb grounded) the bulb will light when the wet contact is closed. But with a dry contact, you'll have to connect one side of the contacts to the bulb and the other side to a supply voltage (with the remaining side of the bulb grounded).
A fast blow fuse will open up as soon as the rated "opening" current is flowing. A slow blow fuse will allow that current to flow for the rated amount of time before it opens up, in order to allow motors to start, for example (which take a higher current while getting up to speed).
