Siemens 3RV2021-4PA10 Motor Circuit Breaker, Class 10, 30-36A

The Siemens 3RV2021-4PA10 is a robust motor circuit breaker engineered to provide comprehensive protection for electric motors in industrial settings. This device is specifically designed to prevent damage from overloads and short circuits, ensuring the longevity and operational reliability of connected machinery. With its precise Class 10 trip characteristic and an adjustable current setting range of 30 to 36 amperes, it offers a versatile solution for various motor control applications.

Advantages

This motor circuit breaker stands out due to its high switching capacity and reliable performance under demanding electrical conditions. The integrated thermal and magnetic release mechanisms provide rapid response times during fault events, effectively isolating the circuit to prevent further damage. Its compact design allows for efficient use of space within control cabinets, while the high-quality construction ensures long-term durability and consistent operation in harsh industrial environments.

Suitable for

• Industrial automation systems
• Motor control centers
• Heating, ventilation, and air conditioning (HVAC) equipment
• Pumping stations and compressor control

When it may not be suitable

This device is not intended for use in circuits where the motor current falls outside the specified 30-36A range. It is also not suitable for applications requiring specialized protection features beyond standard thermal-magnetic overload and short-circuit detection.

Key specifications

• Trip class: Class 10
• Current setting range: 30-36 A
• Protection type: Thermal-magnetic
• Application: Motor protection

How to use

Installation should be performed by qualified personnel in accordance with local electrical regulations. The device is typically mounted on a standard DIN rail within an electrical enclosure. Once mounted, the motor leads are connected to the terminals, and the current setting dial is adjusted to match the nominal current of the motor being protected. After installation, the device can be manually switched on or off using the front-facing toggle, and it will automatically trip in the event of an overload or short circuit.

What to consider before purchase

• Verify that the motor nominal current is within the 30-36A range.
• Ensure the enclosure provides adequate space and ventilation.
• Check compatibility with existing control cabinet mounting standards.

Usage recommendations

Regularly inspect the terminals for tightness and ensure the device is free from dust or debris to maintain optimal performance. If a trip occurs, identify and resolve the underlying fault before resetting the breaker.