Siemens 3RU21261JB0 7-10A Thermal Overload Relay

Siemens 3RU21261JB0 7-10A Thermal Overload Relay

Siemens 3RU21261JB0 Thermal Overload Relay

The Siemens 3RU21261JB0 is a thermal overload relay used to protect electric motors from overheating due to overload or phase failure. It automatically shuts off the motor when it detects unsafe current levels.

Key Features:

• Adjustable Current Range: 7 to 10 amps

• Trip Class 10: Trips within about 10 seconds in an overload condition

• Mounting: Designed to mount directly onto Siemens SIRIUS 3RT contactors (Size S0)

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

• Connection Type: Screw terminals for easy wiring

• Protection Rating: IP20 (finger-safe)

• Operating Temperature: Works in environments from –20°C to +70°C

• Compact Design: Space-saving and lightweight, ideal for control panels

What It Does:

This device protects motors by sensing too much current or a phase loss. When it detects a problem, it trips the circuit to stop the motor and prevent damage. It can be easily reset and has indicators to show its status.