RDS 4 Helios Transformer Controller With Motor Protection

Five step speed controller with integrated thermal contact tripping unit for 400 V, 3 ph. alternating current fans.
To connect thermal contacts wired to the terminal box.
A number of fans can be controlled up to the nominal load. If a thermal contact trips all fans will be disconnected.
Step switch and control lamp included.
Restarting via “0” position after interference or power cut off.