28 September 2021
Understanding the red button labels on LR9D Overload relayProduct Line:
Contactors and Starters-IECEnvironment:
Tesys D contactors and overload relaysResolution:
The H indicates that the device is set to hand reset mode, and the A indicates that the device is set to auto reset mode. When you add the "O" the red button can now act as a stop button as well. In HO the device is in hand reset and the red button acts as a stop button, and in AO the device is in auto reset and the red button acts as a stop button.