What is a control switch for EC fans?
While a potentiometer generates an continuous variable 0 - 10 Volt signal, a control switch generates a stepped control signal. The 0-10 Volt output signal is divided in 3 or 4 steps. This allows you to manually adjust fan speed or damper positions in 3 or 4 steps.
![EC fan control switch](/en/files/faq/image/description/546/control_switch_for_ec_fan.jpg)
These EC fan control switches are available on our website.