Application Case:

In an automotive welding workshop, PLCs control robotic arms and sensors. Grid voltage fluctuates (380V±15%), risking PLC stability.

Solution:

Install a low-frequency isolation transformer (380V→220V) to:

Stabilize voltage‌: Step down to PLC-safe input (220V±5%)

Isolate interference‌: Block grid harmonics/surges;

Overload protection‌: Thermal fuse prevents PLC damage from short circuits.