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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  
These EC fan control switches are available on our website.
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