Legrand 417368 MPX3 Motor Circuit Breaker 45-63A

The Legrand 417368 MPX3 motor circuit breaker is a robust and reliable solution engineered for the protection of electric motors in demanding industrial and commercial environments. This device provides precise control and safety by monitoring current levels and disconnecting the circuit in the event of overloads or short circuits, thereby preventing costly equipment damage and ensuring operational continuity.

Advantages

This motor circuit breaker stands out due to its high short-circuit breaking capacity, which allows it to handle significant electrical faults safely. The adjustable thermal release range provides flexibility, enabling users to calibrate the device precisely to the specific requirements of their motor. Its compact design ensures efficient use of space within electrical cabinets, while the durable construction guarantees long-term reliability even under continuous operation.

Suitable for

• Industrial motor control centers
• Commercial HVAC systems
• Pumping stations and irrigation equipment
• Conveyor belt motor protection
• Manufacturing machinery and assembly lines

This device may not be suitable for applications requiring current ranges outside of the 45-63A threshold. It is also not intended for use in environments where specialized explosion-proof or high-ingress protection enclosures are mandatory without additional housing.

Key specifications

• Adjustable thermal release range: 45-63A
• Width: 55 mm
• Weight: 1.04 kg
• High short-circuit breaking capacity

Installation should be performed by a qualified electrician in accordance with local electrical codes. The device is typically mounted on a standard DIN rail within a control panel. Once mounted, the thermal release should be adjusted to the nominal current rating of the motor being protected. Ensure all terminal connections are tightened to the specified torque to prevent overheating.

What to consider before purchase

• Verify that the motor nominal current falls within the 45-63A range
• Ensure the available space in the electrical enclosure accommodates the 55 mm width
• Check compatibility with existing motor starter configurations

Usage recommendations: Regularly inspect the terminal connections for tightness and check the device for any signs of thermal stress or discoloration. Periodically test the trip mechanism to ensure the protection functions correctly during maintenance intervals.