MP 204 is an electronic motor-protector designed for the protection of an asynchronous motor or a pump.
You cannot use the motor protector in installations where a frequency converter is installed.
The motor protector operates with two sets of limits:
• a set of warning limits
• a set of trip limits.
If one or more of the warning limits are exceeded, the motor continues to run, but the warnings will appear in the display of the motor protector.
Some values only have a warning limit. You can read out the warning with Grundfos GO.
If one of the trip limits is exceeded, the trip relay stops the motor. At the same time, the signal relay is operating to indicate that the limit has been exceeded.

Applications
You can use MP 204 as a stand-alone motor protector.
You can monitor the motor protector via a Grundfos GENIbus.
The motor protector protects the motor primarily by measuring the motor current by means of a true RMS measurement.
The motor protector is designed for single- and threephase motors. In single-phase motors, the starting and run capacitors are also measured. Cos φ is measured in both single- and three-phase systems.

Benefits
The motor protector offers these benefits:
• suitable for both single- and three-phase motors
• dry-running protection
• overload protection
• very high accuracy
• made for submersible pumps.
• monitor motor temperature via motor cable (only motors with tempcon sensor.)
The many monitoring options of the motor protector
The motor protector monitors the following parameters:
• insulation resistance before startup
• temperature (Tempcon, Pt sensor and PTC/thermal switch)
• overload and underload
• overvoltage and undervoltage
• phase sequence
• phase failure
• power factor
• power consumption
• harmonic distortion
• operating hours and number of starts.
Note that monitoring of motor temperature is not possible when you use single-turn transformers.