A look inside a programmable control panel delay relay.

This is a rather neat universal control panel timer that fits onto a standard DIN rail mounting and accepts a control voltage of 12 to 260V. It has two buttons and an LCD display that allow the user to select from a wider range of delay and cycling functions with a huge time range that goes from 0.1 second to 999 hours.
The relay is quite unusual in that its internal relay is powered by batteries and not from the control signal. It uses a magnetic remanence style relay with two coils that can be latched in its on or off state by a short pulse. That reduces the drain on the internal lithium cells, allowing a theoretical 10 year or 1 million relay cycle life.