A control device adapted to be connectable to, and configured to control, an electrical protection circuit including a switch assembly electrically connectable between a transformer neutral of a transformer and ground and being configured to operate in a first state and a second state based on the switch assembly, the second state providing a protection mode, the control device comprising: (a) a first measurement probe (306, 314) adapted to be electrically connectable to the transformer neutral and configured to measure an electrical property at the transformer neutral; the control device is characterised in that it comprises: (b) a second measurement probe (308, 310, 312) adapted to be electrically connected to the electrical protection circuit and configured to measure an electrical property within the electrical protection circuit; and (c) a control module, including a processing device, the control module configured to execute instructions to: (i) monitor a measurement from the first measurement probe (802, 1002) and generate a protection activation control signal based on the measurement from the first measurement probe exceeding a first predetermined threshold, the protection activation control signal being adapted for transmission to the switch assembly (808, 1008); and (ii) monitor a measurement from the second measurement probe (702, 902, 1202) and generate a protection deactivation control signal based on the measurement from the second measurement probe satisfying a second predetermined threshold, the protection deactivation control signal being adapted for transmission to the switch assembly (706, 906, 1206, 1412). (a) a first measurement probe (306, 314) adapted to be electrically connectable to the transformer neutral and configured to measure an electrical property at the transformer neutral; (b) a second measurement probe (308, 310, 312) adapted to be electrically connected to the electrical protection circuit and configured to measure an electrical property within the electrical protection circuit; and (c) a control module, including a processing device, the control module configured to execute instructions to: (i) monitor a measurement from the first measurement probe (802, 1002) and generate a protection activation control signal based on the measurement from the first measurement probe exceeding a first predetermined threshold, the protection activation control signal being adapted for transmission to the switch assembly (808, 1008); and (ii) monitor a measurement from the second measurement probe (702, 902, 1202) and generate a protection deactivation control signal based on the measurement from the second measurement probe satisfying a second predetermined threshold, the protection deactivation control signal being adapted for transmission to the switch assembly (706, 906, 1206, 1412). (i) monitor a measurement from the first measurement probe (802, 1002) and generate a protection activation control signal based on the measurement from the first measurement probe exceeding a first predetermined threshold, the protection activation control signal being adapted for transmission to the switch assembly (808, 1008); and (ii) monitor a measurement from the second measurement probe (702, 902, 1202) and generate a protection deactivation control signal based on the measurement from the second measurement probe satisfying a second predetermined threshold, the protection deactivation control signal being adapted for transmission to the switch assembly (706, 906, 1206, 1412).