Ghost,
We have a similar thing over here for our DIN Rail mounted breakers, in the form of a device that clips onto the rail next to any given breaker, it has a pin that inserts into the side of the breaker and connects with a part that moves when the breaker trips.
Effectively all it is, is a NO contact that you hook up to a piezo unit (also mounted on the DIN Rail) and power it from the panel.
