3RV6021-4CA15 11-16A Motor Protection Circuit Breaker

Introduction to the Siemens 3RV6021-4CA15

When motor protection demands precision and reliability, the 3RV6021-4CA15 from Siemens SIRIUS series delivers. This circuit breaker, size S0, is engineered for three-phase motor protection with a Class 10 trip characteristic. Its adjustable overload release covers 11 to 16 A, ensuring flexibility across various motor ratings.

Part of the trusted SIRIUS product family, the 3RV6021-4CA15 combines robust construction with screw-type terminals for secure wiring. It is designed for standard switching capacity and includes a transverse auxiliary switch, enhancing its versatility in control circuits.

Key Features and Technical Specifications

The 3RV6021-4CA15 is built to perform under demanding conditions. Below are its core specifications:

• Rated operating voltage: 690 V
• Service power at AC-3, 400 V: 7.5 kW
• Operating current at AC-3, 400 V: 16 A
• Adjustable overload release range: 11 – 16 A
• Breaking capacity (Icu) at 400 V: 55 kA
• Mechanical operating cycles: 100,000
• Protection class: IP20 (front)
• Ambient operating temperature: -20 °C to +60 °C

One distinctive feature is the phase disturbance recognition, which helps detect loss of phase—a common cause of motor failure. This enhances motor longevity and reduces unplanned downtime.

Applications and Use Cases

The 3RV6021-4CA15 is ideal for protecting motors in conveyors, pumps, fans, and compressors. Its compact S0 size fits standard 35 mm DIN rails, making it suitable for control panels and motor starter assemblies. The adjustable overload release allows fine-tuning to match specific motor full-load currents, improving protection accuracy.

In addition, the integrated transverse auxiliary switch provides status feedback to PLCs or indicators, enabling remote monitoring and diagnostics. This feature is valuable in automated production lines where immediate fault detection is critical.

Installation and Mounting

Mounting the 3RV6021-4CA15 is straightforward. It supports both screw and snap-on mounting onto a 35 mm standard mounting rail per DIN EN 60715. The mounting position is any, offering flexibility in panel layouts.

Electrical connections are made via screw-type terminals for both main and auxiliary circuits. Connectable conductor cross-sections range from 1 to 10 mm² for solid conductors, and 16 to 8 AWG for AWG types. Always ensure proper torque and secure connections to maintain rated performance.

Maintenance and Reliability

With 100,000 mechanical operating cycles, the 3RV6021-4CA15 is designed for long service life. Its robust construction withstands shock up to 25g for 11 ms, making it suitable for vibration-prone environments.

Routine inspection should include checking terminal tightness and verifying that the overload release setting matches the motor's full-load current. The device is maintenance-free under normal operating conditions, but periodic checks are recommended to ensure optimal protection.

Compatibility and Integration

The auxiliary switch integrated into the 3RV6021-4CA15 allows direct connection to control relays or PLC inputs. Its rated operating currents—2 A at AC-15, 24 V, and 0.5 A at AC-15, 230 V—enable reliable signal transmission.

For DC control circuits, the auxiliary contacts handle 1 A at 24 V and 0.15 A at 60 V (DC-13). This flexibility makes the breaker compatible with a wide range of control systems.

Troubleshooting and Common Issues

If the breaker trips frequently, check for overload conditions or incorrect release setting. Ensure the ambient temperature stays within -20 °C to +60 °C, as extreme temperatures can affect trip characteristics.

For phase loss issues, the phase disturbance recognition feature will trip the breaker, preventing motor damage. If the auxiliary switch fails to signal, verify wiring and contact continuity.

Product Support and Availability

The Siemens 3RV6021-4CA15 is available through AutoDCSTech, a trusted supplier of industrial automation parts. For current stock and lifecycle status, contact AutoDCSTech to confirm availability before ordering.