Legrand M250 Motor Circuit Breaker 3P 11kW 18-25A 1NO/1NC

The Legrand M250 motor circuit breaker is a robust 3-pole protection device engineered to safeguard electric motors with power ratings up to 11kW. This high-performance unit features an adjustable thermal release range between 18A and 25A, allowing for precise calibration to match the specific current requirements of your motor. By integrating both overload and short-circuit protection, it ensures the longevity and reliability of electrical equipment in demanding environments.

Advantages

This motor circuit breaker offers exceptional reliability through its precise thermal release mechanism, which prevents damage caused by overheating or electrical faults. The inclusion of integrated 1NO and 1NC auxiliary contacts simplifies the integration into complex control circuits, providing real-time feedback on the status of the motor. Its compact design and durable construction make it an ideal choice for maintaining operational continuity in industrial settings while minimizing the risk of downtime due to electrical failures.

Suitable for

• Industrial motor control systems
• Protection of three-phase electric motors up to 11kW
• Automation and control panels
• Manufacturing machinery and conveyor systems

When it may not be suitable

This device is specifically designed for motor protection within the 18-25A range and is not suitable for applications requiring higher current ratings or single-phase motor protection. It should not be used in environments that exceed its specified environmental protection ratings or in circuits where the motor power significantly exceeds 11kW.

Key specifications

• Number of poles: 3
• Thermal release adjustment range: 18-25A
• Maximum motor power: 11kW
• Auxiliary contacts: 1NO (Normally Open) and 1NC (Normally Closed)
• Function: Overload and short-circuit protection

How to use

Installation should be performed by a qualified electrician in accordance with local electrical regulations. The device is typically mounted on a standard DIN rail within a control cabinet. Once mounted, connect the power supply to the input terminals and the motor leads to the output terminals. Use the adjustment dial on the front of the unit to set the thermal release current to match the nominal current of the motor being protected. Ensure all connections are tightened to the specified torque to prevent overheating at the terminals.

What to consider before purchase

• Verify that the motor nominal current falls within the 18-25A range.
• Ensure the motor power rating does not exceed 11kW.
• Check the available space in your electrical enclosure for DIN rail mounting.
• Confirm that the auxiliary contact configuration meets your control system requirements.

Usage recommendations: Regularly inspect the terminal connections for tightness and check the device for any signs of physical damage or discoloration. Test the trip function periodically to ensure the protection mechanism remains fully operational.