LOVATO Electric SM3R9000 Motor Protection Circuit Breaker 70-90A 50kA 400V

The LOVATO Electric SM3R9000 is a professional-grade motor protection circuit breaker engineered to provide robust control and safety for industrial electrical systems. With an adjustable thermal release range of 70-90A and a high breaking capacity of 50kA at 400V, this device is built to handle demanding operational environments while protecting motors from critical electrical faults.

Advantages

This circuit breaker offers exceptional reliability by combining thermal and magnetic protection in a single compact unit. Its precise adjustment capabilities allow for accurate current setting, ensuring that the motor is protected against overloads without unnecessary nuisance tripping. The high short-circuit breaking capacity ensures that the device can safely interrupt high fault currents, thereby preventing damage to connected equipment and maintaining the integrity of the electrical installation.

Suitable for

• Industrial motor control centers
• Heavy-duty machinery and conveyor systems
• Pump and fan control applications
• Electrical distribution panels requiring motor protection

When it may not be suitable

This device is not intended for use in residential low-voltage circuits or applications requiring current ratings outside the 70-90A range. It is specifically designed for industrial motor protection and may not be compatible with specialized electronic control systems that require different tripping characteristics.

Key specifications

• Thermal release range: 70-90A
• Breaking capacity: 50kA at 400V
• Operational voltage: 400V
• Protection type: Thermal and magnetic

How to use

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 an electrical enclosure. Once mounted, the thermal release current should be adjusted to match the nominal current of the motor being protected. After wiring the power input and motor output terminals, the device can be manually operated using the front-facing toggle switch to start or stop the motor or to reset the breaker after a trip event.

What to consider before purchase

• Verify that the motor nominal current falls within the 70-90A range
• Ensure the enclosure provides adequate space and ventilation
• Confirm compatibility with the existing electrical distribution system voltage

Usage recommendations: Regularly inspect the terminal connections for tightness and check the device for any signs of overheating or physical damage. Always perform a test trip if the system has been inactive for an extended period to ensure the mechanical tripping mechanism remains functional.