The QF switch in VFD (Variable Frequency Drive) wiring diagram functions as a circuit breaker or protection switch.
How it protects the VFD system?
Overcurrent Protection
If the current exceeds the safe limit, it disconnects the power supply to protect the VFD and motor.
Short-Circuit Protection
If there is a short circuit in the wire or VFD, the QF will promptly trigger and isolate the issue.
Overload Safety
Overload Safety keeps upstream electricity lines from overheating because of prolonged overload.
Isolation Function
Isolation Function provides a safe way to turn off power to the VFD for maintenance or an emergency shutdown.
The QF switch is the first line of defense contrary to electrical failures, protecting the VFD and motor from damage.
Why does current avoid the center of a conductor?