Control device, pump unit, and refrigerant circulation device

A pump assembly comprising:

• a first connector attachable to and detachable from an external device;
• a motor;
• a pump rotor that is rotatable by power generated by the motor;
• a power supply path electrically connected between the motor and the first connector;
• a load switch to switch between connection and disconnection of the power supply path;
• a protection circuit to protect the load switch from an inrush current to the load switch;
• and
• a control circuit to output a drive signal to switch the load switch from disconnection to connection after a preset set time as a time until a connection state between the external device and the first connector is stabilized, which has elapsed since connection of the first connector to the external device was detected;
• wherein
• the protection circuit includes at least a capacitor and switches the load switch from disconnection to connection for a predetermined first time as a time for gradually transitioning the load switch from OFF to ON based on a charging time of the capacitor by the drive signal, and
• the motor is operable to generate the power in response to the load switch being switched to connection.