The Low Pressure (L.P.) cutout is a safety device in refrigeration and air conditioning systems. It deactivates the compressor when suction pressure falls below a safe threshold, preventing the evaporator coil from freezing and protecting the compressor from operating with insufficient refrigerant. The L.P. cutout electrically opens the circuit if suction line pressure becomes too low. An overload protector, distinct from the L.P. cutout, addresses electrical overcurrent. A relay is a general-purpose switch. The High Pressure (H.P.) cutout functions oppositely to the L.P. cutout, responding to high discharge pressure. Consequently, the L.P. cutout is the appropriate choice in this context.