A VFD requires a circuit breaker with C or D trip curve, rated 15-20% above the drive input current. For example, a 7.5 kW (380V) VFD with 17A input current needs a 20-25A breaker.
Determine the VFD input current from the datasheet. Select a breaker rated 15-20% higher. For VFDs up to 30 kW, C-curve is typical; for higher power, use D-curve. Contact our specialists for precise selection.
Yes, a circuit breaker before a variable frequency drive is a mandatory protection element. It protects against short circuits and overloads at the input. Without a breaker, cable or VFD damage could lead to fire.