A motor protection circuit breaker (MPCB) is an essential electrical device specifically designed to shield electric motors from potential harm resulting from excessive currents, voltage fluctuations, or electrical faults. MPCBs find extensive use across diverse industrial applications, including manufacturing plants, conveyor systems, pumps, compressors, and HVAC systems. TOSUNlux MP series MPCBs serve multiple purposes, including overload and short circuit protection in AC 50/60Hz power circuits up to 660V, ranging from 0.1-80A. They function as full-voltage starters, facilitating motor startup and disconnection under AC3 load conditions. Furthermore, MPCBs ensure the safeguarding of circuits and power equipment in the distribution network by providing overload and short circuit protection. The core functionalities of MPCBs comprise isolation, overload and short circuit protection for motors, and motor control (on/off). In the event of overcurrent or short circuit occurrences that may potentially damage the motor, MPCBs automatically disconnect the electrical circuits, averting any harm. Advanced MPCBs go a step further by incorporating phase loss protection, preventing the motor from hazardous conditions such as excessive winding heat or even burning. In summary, a motor protection circuit breaker is a specialized electrical device crucial for shielding electric motors against damage arising from excessive currents, voltage variations, or electrical faults. MPCBs are widely employed across diverse industrial applications, providing isolation, protection against overload and short circuit, and control over motor operations.