I see it says OVP, but is that to protect attached load or itself? The spec sheet I found had no voltage trigger for the OVP listed.
OVP in an 12V system external VR meaning anything but monitoring the DC voltage coming from an external power source and protecting the rest of the connected circuitry using one of two methods: a crowbar clamp circuit or a series-connected switch, would be false advertizing. The V1700 at $150 may be a better footprint. The adjustable output voltage and OVP made it a no brainer for me.
I emailed WAI Transpo, but I'm guessing it is a switch, not a crowbar. No guarentee of fuse or circuit breaker in a non-aviation product's sense circuit.
I bet it is similar to a Zeftronics $450 unit-
"The Zeftronics R15V00 ACU (alternator Control Unit) is a direct replacement for OEM ACU units but requires the removal of the Cessna Over Voltage Sense unit PN C593001-0101 located between the Alternator Switch and the Alternator Field Circuit breaker. The Over Voltage Sense Unit will need to be removed from the circuit and just the Noise Suppressor left in the circuit."
"The R15V00 Rev A is a 14Vdc electronic Alternator Controller (Voltage Regulator and Over Voltage Sensor) designed for use with 12Vdc aircraft alternators. It combines the OV Sensor and regulator in one unit that is fully pin and function compatible with the Cessna equivalent units. This unit provides Voltage Regulation, Overvoltage Protection, Low/High Voltage indicator pin, self-protecting Field-to-ground short protection, as well as an on-unit Trouble-Shooting Light (TSL). The OV sensor removes power from the regulator thus dropping the alternator off-line when the sysytem voltage exceeds 16 volts. The indicator pins allows a light connected to it and bus to come on whenever the alternator switch is open, the OV sensor is defective (open), or the wire to pin S is open. The unit will turn itself off and turn on a RED TSL light if it senses that the alternator field or field wire is shorted to ground. When the ground fault is removed or repaired, the unit with come back on line (with a GREEN TSL light) once the alternator switch is cycled. If the wire from the alternator battery terminal to pin A is broken, the on-unit light will be OFF."