Siemens 3RV2021-4AA10 Motor Circuit Breaker, 3-Pole, 11-16A, 7.5kW, Size S0

The Siemens 3RV2021-4AA10 is a robust 3-pole motor circuit breaker engineered to provide reliable protection for electrical motors in industrial environments. Designed for efficiency and safety, this size S0 device effectively manages current ranges between 11A and 16A, supporting motors with a power rating of up to 7.5kW. It serves as a critical component in automation systems, ensuring that motors are shielded from the damaging effects of overloads and short circuits during operation.

Advantages

This motor circuit breaker offers exceptional reliability and durability, making it a preferred choice for demanding industrial settings. Its compact size S0 design allows for space-saving installation within control cabinets without compromising performance. The device provides precise protection settings, which helps in preventing unnecessary downtime and extending the service life of connected motors. Furthermore, its robust construction ensures consistent operation even under challenging electrical conditions, contributing to the overall stability of the automation infrastructure.

Suitable for

• Industrial motor control systems
• Automation and manufacturing machinery
• Protection of three-phase induction motors
• Switchgear and control panel assemblies

When it may not be suitable

This device is specifically calibrated for motors within the 11-16A range and is not suitable for applications requiring different current ratings or for single-phase motor protection where specific requirements differ. It should not be used in environments that exceed its specified environmental protection ratings or in applications requiring specialized hazardous area certifications.

Key specifications

• Number of poles: 3
• Current range: 11-16A
• Power rating: 7.5kW
• Size: S0
• Weight: 0.361 kg

How to use

The motor circuit breaker should be installed by a qualified professional within a suitable electrical enclosure. It is typically mounted on a standard DIN rail. Once mounted, the power supply cables and motor leads are connected to the designated terminals. The thermal release should be adjusted according to the specific nominal current of the motor being protected to ensure optimal performance. After installation, the device can be operated manually using the front-facing 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's nominal current falls within the 11-16A range.
• Ensure the 7.5kW power rating matches your motor specifications.
• Check available space in your control cabinet for size S0 equipment.
• Confirm compatibility with your existing three-phase power supply system.

Usage recommendations

Always ensure that the power supply is disconnected before performing any installation or maintenance work on the circuit breaker. Regularly inspect the terminals for tightness and check for any signs of thermal stress to maintain long-term operational safety.