SIEMENS SIRIUS 3RU21161JB0 Thermal Overload Relay 7-10 A Class 10 S00 Screw Terminals

Thermal overload relay from the SIRIUS 3RU2 series, engineered for reliable motor protection in industrial environments. With a current setting range of 7 to 10 A and tripping class 10, it safeguards three-phase motors against overload, phase failure, and asymmetry, ensuring long service life and reduced downtime.

Advantages

The relay offers direct mounting to SIRIUS contactors or stand-alone installation, simplifying wiring and saving panel space. Its manual/automatic reset function and auxiliary contacts (1 NO + 1 NC) provide flexible control and signaling options. Screw terminals guarantee secure, vibration-resistant connections, while the IP20 protection and wide operating temperature range (-20 to +60 °C) ensure dependable operation in harsh conditions.

Suitable for

• Protection of three-phase motors up to 10 A in industrial control panels.
• Applications requiring quick tripping on overload (Class 10) for standard motor starting conditions.
• Integration with SIRIUS 3RT contactors for compact motor starters.
• Machinery and equipment where phase failure protection is critical.

Key specifications

• Current setting range: 7 - 10 A
• Tripping class: CLASS 10
• Size: S00, 3-pole
• Rated operational voltage: up to 690 V AC
• Auxiliary contacts: 1 NO + 1 NC
• Reset function: manual and automatic
• Connection: screw terminals (main and auxiliary)
• Protection class: IP20
• Standards: IEC 60947-4-1, IEC 60947-5-1

Recommendations

For optimal performance, pair this relay with a SIRIUS 3RT2 contactor of matching size. Ensure proper current setting according to motor full-load current. Mount in an enclosure with adequate ventilation and protection against dust and moisture.