I work for the grid too and we also have these. Usually only for bigger substations to transmit measurements and switching states, maybe a bit of telemetry like a tripped fuse.

I hope for dear god that you are remembering wrong and none of them trigger when loosing connection. Whoever thought of that should be immediately fired.

A loss of connection from a single device should never trip a circuit breaker (no idea how the bigger equivalent is called in english), especially if its connected wireless.