The Siemens 3RU21264NB0 is a thermal overload relay designed to protect electric motors from overload and phase failure. It’s part of the SIRIUS 3RU2 series and is made to mount directly to Siemens S0 contactors.
Key Features:
Current Range: 23–28 A
Trip Class: 10 (standard motor protection)
Mounting: For S0 size Siemens contactors
Reset Options: Manual or automatic
Built-in Functions: Test, Stop, and status indicator
Connection Type: Screw terminals
Protection Class: IP20
Operating Temperature: –40 °C to +70 °C
Ideal for protecting motors in pumps, fans, conveyors, and other industrial machinery.
