Over/under voltage detector - with schematic

This is an odd device. It attaches to the side of a compatible circuit breaker, and connects to its outgoing connections. If an overvoltage or undervoltage situation occurs the device triggers and switches off the circuit breaker.
It's important to note that the unit musn't be powered continuously in a fault condition. If the power is not cut to it when it triggers, then the coil and circuitry will potentially suffer damage.
I took a guess at what the circuitry might be inside, but was completely wrong. In the true style of cost driven engineering, the circuitry is the cheapest possible.
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