SIRIUS overload relays with screw-type, spring-loaded or ring cable lug connections reliably protect loads as well as other switching and protective devices in the respective load feeder against overload, phase asymmetry and phase failure. Thanks to ATEX certification, they can be used in many different applications and are even suitable for protecting motors designed for use in explosive environments. The overload relays can easily be used with the contactors of the SIRIUS module kit.
For demanding applications, the modular variants of the 3RB22, 3RB23 or 3RB24 electronic overload relays even offer full motor protection using connected thermistors to sense the motor temperature, as well as comprehensive display and signaling functions, and a communication link using IO-Link.
Optimized, standard accessories are available for 3RU2 and 3RB3. This helps to reduce costs for ordering and maintaining stocks

Thermal Overload Relays - 3RU
• Can be directly mounted to SIRIUS range of contactors
• Running cost reduction due to less power loss
• Sealing cap on setting dial to prevent direct access

Microprocessor based overload relay - 3RB
• SIRIUS 3RB range of Microprocessor based motor protection relays offer protection for motors against various 
   faults viz., overload, phase failure, earth fault etc
• The higher end 3RB relays with large setting (1:10) also offer thermistor protection. 
• They are modular in design and can accommodate add on modules such as internal earth fault protection module, 
  analog output module, overload warning module, ground fault signalling module, etc.

SIRIUS overload relays with screw-type, spring-loaded or ring cable lug connections reliably protect loads as well as other switching and protective devices in the respective load feeder against overload, phase asymmetry and phase failure. Thanks to ATEX certification, they can be used in many different applications and are even suitable for protecting motors designed for use in explosive environments. The overload relays can easily be used with the contactors of the SIRIUS module kit.
For demanding applications, the modular variants of the 3RB22, 3RB23 or 3RB24 electronic overload relays even offer full motor protection using connected thermistors to sense the motor temperature, as well as comprehensive display and signaling functions, and a communication link using IO-Link.
Optimized, standard accessories are available for 3RU2 and 3RB3. This helps to reduce costs for ordering and maintaining stocks

Thermal Overload Relays - 3RU
• Can be directly mounted to SIRIUS range of contactors
• Running cost reduction due to less power loss
• Sealing cap on setting dial to prevent direct access

Microprocessor based overload relay - 3RB
• SIRIUS 3RB range of Microprocessor based motor protection relays offer protection for motors against various 
   faults viz., overload, phase failure, earth fault etc
• The higher end 3RB relays with large setting (1:10) also offer thermistor protection. 
• They are modular in design and can accommodate add on modules such as internal earth fault protection module, 
  analog output module, overload warning module, ground fault signalling module, etc.