EATON 189903 3-Pole Motor Protection Circuit Breaker 4kW 6.3-10A

The EATON 189903 is a robust 3-pole motor protection circuit breaker engineered to provide dependable control and safety for electrical motors. Designed for industrial and commercial environments, this device effectively manages power distribution while safeguarding equipment from electrical faults. With a power rating of 4kW and an adjustable thermal release range between 6.3A and 10A, it offers precise protection tailored to specific motor requirements.

Advantages

This circuit breaker excels in providing comprehensive protection against both thermal overloads and short circuits, which are critical for maintaining the longevity of motor systems. Its compact design allows for efficient space utilization within control panels, while the adjustable current range ensures flexibility during installation and maintenance. The high-quality construction guarantees reliable performance under demanding operational conditions, minimizing downtime and enhancing overall system safety.

Suitable for

• Industrial motor control systems
• Commercial HVAC equipment
• Pump and compressor motor protection
• Conveyor belt drive systems

This device may not be suitable for applications requiring current ratings outside the 6.3A to 10A range or for motors exceeding the 4kW power capacity. It is also not intended for use in environments with extreme moisture or corrosive substances unless housed in an appropriate protective enclosure.

Key specifications

• Number of poles: 3
• Power rating: 4kW
• Thermal release range: 6.3A - 10A
• Function: Overload and short-circuit protection

Installation should be performed by a qualified professional in accordance with local electrical regulations. The device is typically mounted on a standard DIN rail within an electrical distribution board. Once mounted, the thermal release current must be calibrated to the specific nominal current of the connected motor to ensure optimal protection.

What to consider before purchase

• Verify the nominal current of your motor matches the 6.3A-10A adjustment range
• Ensure the power rating of 4kW is sufficient for your specific motor
• Check available space in your electrical cabinet for mounting
• Confirm compatibility with existing DIN rail systems

Usage recommendations: Regularly inspect the circuit breaker for signs of wear or heat damage and perform periodic testing of the trip mechanism to ensure continued operational reliability.