An apparatus comprising: at least one power monitor comprising: a set of input terminals (L, N, GND) at which to receive input power and a set of output terminals (L', N', GND) at which to provide output power; a switch circuit electrically interposed between the input (L, N, GND) and output terminals (L', N', GND) and compelled into a conductive state and a non-conductive state in accordance with a signal (V SW) provided thereto; a control circuit to transition between a plurality of controller states responsive to levels of deviation from a nominal level in a process variable that includes an input voltage associated with the input power and to provide the signal to the switch circuit in accordance with levels of the input voltage assigned to the respective controller states to: control the switch circuit into the conductive state in response to the input voltage being below a first over voltage threshold (OV rs) while the switch circuit is in the non-conductive state; record an indication of an occurrence of an over voltage event and control the switch circuit to remain in the conductive state in response to the input voltage exceeding a second over voltage threshold (OV rc) that is higher than the first over voltage threshold (OV rs) while the switch circuit is in the conductive state; and control the switch circuit into the non-conductive state in response to the input voltage exceeding a third over voltage threshold (OV sh) that is higher than the second over voltage threshold (OV rc) while the switch circuit is in the conductive state; and a communication module to receive action criteria data over a communication channel in a communication network, the action criteria data defining state transition boundaries at the levels of deviation of the process variable; a database to store at least one record in which identification data of the power monitor is associated with a user; and an access device remote from the power monitor and operable by the user to obtain the identification data of the power monitor from the database, the access device having a communication module with which the communication channel is formed with the communication module of the power monitor to provide the action criteria data thereto, the communication channel being formed using the identification data of the power monitor obtained from the database by the user. a set of input terminals (L, N, GND) at which to receive input power and a set of output terminals (L', N', GND) at which to provide output power; a switch circuit electrically interposed between the input (L, N, GND) and output terminals (L', N', GND) and compelled into a conductive state and a non-conductive state in accordance with a signal (V SW) provided thereto; a control circuit to transition between a plurality of controller states responsive to levels of deviation from a nominal level in a process variable that includes an input voltage associated with the input power and to provide the signal to the switch circuit in accordance with levels of the input voltage assigned to the respective controller states to: control the switch circuit into the conductive state in response to the input voltage being below a first over voltage threshold (OV rs) while the switch circuit is in the non-conductive state; record an indication of an occurrence of an over voltage event and control the switch circuit to remain in the conductive state in response to the input voltage exceeding a second over voltage threshold (OV rc) that is higher than the first over voltage threshold (OV rs) while the switch circuit is in the conductive state; and control the switch circuit into the non-conductive state in response to the input voltage exceeding a third over voltage threshold (OV sh) that is higher than the second over voltage threshold (OV rc) while the switch circuit is in the conductive state; and a communication module to receive action criteria data over a communication channel in a communication network, the action criteria data defining state transition boundaries at the levels of deviation of the process variable; control the switch circuit into the conductive state in response to the input voltage being below a first over voltage threshold (OV rs) while the switch circuit is in the non-conductive state; record an indication of an occurrence of an over voltage event and control the switch circuit to remain in the conductive state in response to the input voltage exceeding a second over voltage threshold (OV rc) that is higher than the first over voltage threshold (OV rs) while the switch circuit is in the conductive state; and control the switch circuit into the non-conductive state in response to the input voltage exceeding a third over voltage threshold (OV sh) that is higher than the second over voltage threshold (OV rc) while the switch circuit is in the conductive state; and