Electronic Overload Relays SIRIUS 3RB24 for IO-Link

Integrated motor protection for high-feature applications with the SIRIUS 3RB24 communication-capable overload relay for IO-Link – connect your load feeder to the higher-level control and benefit from various communication advantages. The readout of current values, diagnostics and locally set parameters e.g. increases plant availability and eases system documentation. The transmission of analog process variables like currents supports you in optimizing your system processes. In addition, the overload relay can also be used as a direct, reversing and star-delta starter when combined with contactors. Further highlights are the direct voltage supply via IO-Link (24 V DC), variably adjustable trip classes CLASS 5/10/20/30 for normal and heavy-duty start-up solutions, full motor protection thanks to connection of a PTC thermistor sensor (thermistor motor protection) as well as compliance with all relevant international standards and approvals (also ATEX certification for explosive motors).

Advantages at a glance

Reduced machine downtimes and optimized planning of maintenance measures

  • Diagnostic messages like e.g. ground fault tripping, overload, thermistor protection tripping as well as their processing in the higher-level control

Easy system documentation

  • Read-out of current values and other diagnostic information

  • Read-out of parameters

Optimized system processes

  • Connection of the load feeder to the automation environment via IO-Link

  • Seamless integration into the automation environment, e.g. STEP 7

  • Read-out of current values and diagnostic messages


  • Optional 3RA6935 operator panel for on-site control and monitoring

  • Modular device concept consisting of current detection and evaluation module

  • Full starter functionality in combination with SIRIUS contactors (direct, reversing and star-delta start)