Time counter pull-up relay

Here, we see a specialized electronic instrument—manufactured in Greece in 1980—designed to measure the response time of electromagnetic switches (relays). “Pull-in time” is defined as the interval from the moment power is applied to the coil until the contacts change state, whereas “drop-out time” is defined as the interval from the moment power to the coil is cut off until the contacts fully release and return to their initial state. Measurements are taken in milliseconds (ms) to verify the operating speed of automation and protection systems.