FQ fan control box <br /> Features: Low natural frequency, simple and reliable structure, and easy installation.
Uses: used to protect the overload and short circuit of lines and fans.
Working principle: The electric control box power supply is a three-phase five-wire power supply. The three-phase power supply can be fed up or down. Connected to the terminal block at the bottom of the electric control box, the installed automatic air switch QF is used for two-speed fan short-circuit protection, and the thermal relay FR is used for low-speed overload protection.