System 3000 speed regulator insert Features: Speed regulator for single-phase motors such as induction or shaded-pole motors. Device operates on phase angle control principle. Switch on by soft start to maximum speed. Minimum speed can be persistently stored. Connecting auxiliary units is possible. Electronic short-circuit protection. Electronic excess-temperature protection. Operation with and without neutral conductor connection. Notes : If the ambient temperature is higher than +25 C, the connected load must be reduced.