Siemens 3RU21261FB0 3.5-5A Thermal Overload Relay

Siemens 3RU21261FB0 3.5-5A Thermal Overload Relay 

The 3RU21261FB0 is a thermal overload relay designed to protect small 3-phase motors from overheating and power loss. It works with Siemens S0 contactors and is easy to install in control panels.

Key Features

• Adjustable Current Range: 3.5 to 5 amps

• Trip Class: Class 10 (trips in about 10 seconds during overload)

• Reset Options: Manual or automatic reset with test and stop button

• Mounting: Directly mounts to Siemens 3RT S0 contactors or panel

• Voltage Rating: Up to 690V AC

• Operating Temperature: –40 °C to +70 °C

Benefits

• Protects motors from damage caused by overload or phase failure

• Compact design saves space in panels

• Easy to reset, test, and monitor

• Works globally with certifications like UL, CSA, and IEC

Common Uses

• Motor control panels

• HVAC systems

• Pumps, fans, and industrial machines