Siemens 3RV2021-4BA25 Motor Circuit Breaker, 3-Pole, 13-20A, 7.5kW, Spring-Loaded Terminals, Size S0

The Siemens 3RV2021-4BA25 is a robust motor circuit breaker engineered to provide dependable protection for electric motors in demanding industrial environments. This 3-pole device is designed for a current range of 13-20A and supports a power rating of 7.5kW. Built in the compact S0 size, it integrates seamlessly into control cabinets, offering both short-circuit and overload protection to ensure the longevity and safety of connected motor equipment.

Advantages

The primary benefit of this motor circuit breaker is its high level of operational reliability and safety. The inclusion of spring-loaded terminals significantly reduces installation time while ensuring a vibration-resistant and maintenance-free connection. With integrated 1NO and 1NC auxiliary contacts, the device provides essential feedback for monitoring and control systems, enhancing the overall efficiency of industrial automation setups.

Suitable for

• Industrial motor protection
• Automation and control systems
• Heating, ventilation, and air conditioning systems
• Pump and compressor control

When it may not be suitable

This device is not intended for use in circuits exceeding its specified current range of 13-20A or power rating of 7.5kW. It is also not suitable for environments that require specific ingress protection ratings beyond standard control cabinet installations without additional protective enclosures.

Key specifications

• Number of poles: 3
• Current range: 13-20A
• Power rating: 7.5kW
• Size: S0
• Connection type: Spring-loaded terminals
• Auxiliary contacts: 1NO + 1NC

How to use

Installation should be performed by qualified personnel in accordance with local electrical regulations. The device is designed for mounting on a standard DIN rail. Insert the power cables into the spring-loaded terminals, ensuring they are securely seated. The auxiliary contacts can be wired to your PLC or control relay to provide status signals. Once installed, the thermal release can be adjusted within the 13-20A range to match the specific requirements of the connected motor.

What to consider before purchase

• Verify that the motor's nominal current falls within the 13-20A range.
• Ensure the 7.5kW power rating is compatible with your motor application.
• Confirm that your wiring setup supports spring-loaded terminal connections.
• Check available space in the control cabinet for size S0 components.

Usage recommendations: Regularly inspect the terminal connections and test the trip mechanism periodically to ensure continued protection of your motor assets.