Siemens 3RU21264AB0 11-16A Thermal Overload Relay

Siemens 3RU21264AB0 11-16A Thermal Overload Relay 

The Siemens 3RU21264AB0 is a thermal overload relay designed to protect electric motors from overheating or phase failure. It automatically shuts off the motor when dangerous conditions occur and can be reset manually or automatically.

Key Features:

• Adjustable current range: 11 to 16 amps

• Trip class: Class 10 (trips within ~10 seconds under overload)

• Mounting: Fits directly on Siemens SIRIUS 3RT contactors (Size S0)

• Reset options: Manual or automatic reset, with test and stop buttons

• Connection type: Screw terminals for secure wiring

• Protection rating: IP20 (finger-safe front)

• Operating temperature: –20°C to +70°C

• Compact size: Saves space in control panels

How It Works:

The relay uses a bimetallic strip that heats up when the motor draws too much current. If an overload or phase failure is detected, the relay trips and shuts off the motor to prevent damage. It can be reset after the issue is resolved.