The ABB Thermal Overload Relay (12V DC variant) is an electromechanical protection device primarily designed to safeguard motors from damage due to overloads or phase failure. It works by using bimetal trip elements: when excess current flows through the motor, these elements heat up and bend, which triggers the relay to change the position of its contacts, thereby disconnecting the motor and protecting it.
Key Features
Voltage:12V DC version (other variants available up to 600V/690V AC/DC)
Application:Motor protection for single and three-phase motors.
Pole Configuration:Typically 3-pole relays for broader application compatibility.
Adjustable Current Range:Allows setting according to the motor's rated full load current.
Trip Classes:Commonly trip class 10A or 20 for different tripping times (Class 10A = 2–10_seconds, Class 20 = 9–30_seconds).
