VRDT Transformer controller

VRDT for AC-motors. A manual 5-step transformer controller with 0-position and high/low speed switch for speed control of voltage controllable 3-phase motors.
Changeover is done with a potential switch e.g. timer, thermostat or humidistat.
The thermal contact relays are connected to the motor’s protracted thermal contact conductor.
VRDT breaks the current when the motor gets overheated (It’s reset when the motor has cooled down and the switch is in 0-position).
Enclosed in a durable steel housing.