1. Brake: Special braking device, can be skidding instant when the power cut off to ensure absolute safety in use.

2. American single-chip microcomputer Intelligent control. The signals from smoke sensor and temperature sensor are receiving to the controlled by three different programs.

3. Automatic and manual control of fire door opener. Beside that, the opener have different kinds of protective functions, such as incoming line phase lost protection, phase sequence change protection, and over-load protection etc.
The control circuit and the controlled circuit are separated by a phototube & Powerful in anti interference. The Main control has large capacity and long service life.